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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2016	Jul. 25, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	Five9, Inc.
Trading Symbol	FIVN
Entity Central Index Key	0001288847
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		52,554,124

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 57,638	$ 58,484
Accounts receivable, net	10,765	10,567
Prepaid expenses and other current assets	3,390	2,184
Total current assets	71,793	71,235
Property and equipment, net	13,188	13,225
Intangible assets, net	1,785	2,041
Goodwill	11,798	11,798
Other assets	932	934
Total assets	99,496	99,233
Current liabilities:
Accounts payable	3,004	2,569
Accrued and other current liabilities	9,153	7,911
Accrued federal fees	6,008	5,684
Sales tax liability	1,215	1,262
Revolving line of credit	12,500	12,500
Notes payable	6,576	7,212
Capital leases	5,271	4,972
Deferred revenue	7,898	6,413
Total current liabilities	51,625	48,523
Sales tax liability — less current portion	1,650	1,915
Notes payable — less current portion	14,572	17,327
Capital leases — less current portion	4,617	4,606
Other long-term liabilities	579	582
Total liabilities	73,043	72,953
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.001 par value; 5,000 shares authorized, no shares issued and outstanding at June 30, 2016 and December 31, 2015	0	0
Common stock, $0.001 par value; 450,000 shares authorized, 52,554 shares and 51,165 shares issued and outstanding at June 30, 2016 and December 31, 2015, respectively	53	51
Additional paid-in capital	189,199	180,649
Accumulated deficit	(162,799)	(154,420)
Total stockholders’ equity	26,453	26,280
Total liabilities and stockholders’ equity	$ 99,496	$ 99,233

Condensed Consolidated Balance Sheets - Parenthetical - $ / shares	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Preferred Stock, par value (in USD per share)	$ 0.001	$ 0.001
Preferred Stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred Stock, shares issued (in shares)	0	0
Preferred Stock, shares outstanding (in shares)	0	0
Common Stock, par value (in USD per share)	$ 0.001	$ 0.001
Common Stock, shares authorized (in shares)	450,000,000	450,000,000
Common Stock, shares issued (in shares)	52,554,124	51,164,621
Common Stock, shares outstanding (in shares)	52,554,124	51,164,621

Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Revenue	$ 38,886	$ 30,274	$ 76,901	$ 60,548
Cost of revenue	16,764	14,270	33,374	29,048
Gross profit	22,122	16,004	43,527	31,500
Operating expenses:
Research and development	5,799	5,568	11,601	11,606
Sales and marketing	12,637	10,594	25,343	20,525
General and administrative	5,882	6,027	12,418	13,302
Total operating expenses	24,318	22,189	49,362	45,433
Loss from operations	(2,196)	(6,185)	(5,835)	(13,933)
Other expense, net:
Interest expense	(1,197)	(1,155)	(2,396)	(2,294)
Interest income and other	(33)	(49)	(78)	(47)
Total other expense, net	(1,230)	(1,204)	(2,474)	(2,341)
Loss before income taxes	(3,426)	(7,389)	(8,309)	(16,274)
Provision for (benefit from) income taxes	42	(20)	70	(2)
Net loss	$ (3,468)	$ (7,369)	$ (8,379)	$ (16,272)
Net loss per share:
Basic and diluted (in USD per share)	$ (0.07)	$ (0.15)	$ (0.16)	$ (0.33)
Shares used in computing net loss per share:
Basic and diluted (in shares)	52,143	49,980	51,760	49,708
Other comprehensive income (loss):
Change in unrealized gain/loss on short-term investments, net of tax	$ 0	$ 1	$ 0	$ 0
Comprehensive loss	$ (3,468)	$ (7,368)	$ (8,379)	$ (16,272)

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net loss	$ (8,379)	$ (16,272)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	4,163	3,685
Provision for doubtful accounts	41	134
Stock-based compensation	4,408	4,065
Loss on disposal of property and equipment	2	9
Amortization of debt discount	178	171
Others	(7)	(1)
Changes in operating assets and liabilities:
Accounts receivable	(245)	(57)
Prepaid expenses and other current assets	(1,206)	(2,268)
Other assets	62	(87)
Accounts payable	357	(1,394)
Accrued and other current liabilities	1,389	2,035
Accrued federal fees and sales tax liability	12	165
Deferred revenue	1,535	163
Other liabilities	(53)	(58)
Net cash provided by (used in) operating activities	2,257	(9,710)
Cash flows from investing activities:
Purchases of property and equipment	(568)	(414)
(Increase) Decrease in restricted cash	(60)	806
Purchase of short-term investments	0	(20,000)
Proceeds from maturity of short-term investments	0	40,000
Net cash (used in) provided by investing activities	(628)	20,392
Cash flows from financing activities:
Proceeds from exercise of common stock options	3,352	349
Proceeds from sale of common stock under ESPP	792	680
Repayments of notes payable	(3,563)	(1,572)
Payments of capital leases	(3,056)	(3,095)
Net cash used in financing activities	(2,475)	(3,638)
Net (decrease) increase in cash and cash equivalents	(846)	7,044
Cash and cash equivalents:
Beginning of period	58,484	58,289
End of period	57,638	65,333
Non-cash investing and financing activities:
Equipment obtained under capital lease	3,352	2,394
Equipment purchased and unpaid at period-end	$ 102	$ 34

Description of Business and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Summary of Significant Accounting Policies	1. Description of Business and Summary of Significant Accounting Policies Five9, Inc. and its wholly-owned subsidiaries (the “Company”) is a provider of cloud software for contact centers. The Company was incorporated in Delaware in 2001 and is headquartered in San Ramon, California. The Company has offices in Europe and Asia, which primarily provide research, development, sales, marketing, and client support services. Basis of Presentation The accompanying condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015. All intercompany transactions and balances have been eliminated in consolidation. Use of Estimates The preparation of condensed consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. The significant estimates made by management affect revenue, the allowance for doubtful accounts, intangible assets, goodwill, loss contingencies, including the Company’s accrual for federal fees and sales tax liability, accrued liabilities, stock-based compensation, provision for income taxes and uncertain tax positions. Management periodically evaluates such estimates and they are adjusted prospectively based upon such periodic evaluation. Actual results could differ from those estimates. Significant Accounting Policies The Company’s significant accounting policies are disclosed in its Annual Report on Form 10-K for the year ended December 31, 2015. During the six months ended June 30, 2016, there were no changes to the Company's significant accounting policies. Recently Adopted Accounting Pronouncements In November 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2015-17, Balance Sheet Classification of Deferred Taxes. This ASU eliminates the requirement for companies to present deferred tax assets and liabilities as current and noncurrent on the balance sheet and, instead, requires companies to classify all deferred tax assets and liabilities as noncurrent. As permitted by ASU 2015-17, the Company early-adopted this new guidance at the beginning of the fourth quarter of 2015 and applied it prospectively. No prior periods were retrospectively adjusted. In April 2015, the FASB issued ASU No. 2015-05, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement. The ASU provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The ASU does not change the accounting for a customer’s accounting for service contracts. A company can elect to adopt the ASU either prospectively or retrospectively. The Company adopted this guidance prospectively beginning in the first quarter of 2016 and the adoption did not have a material effect on its condensed consolidated financial statements. In April 2015, the FASB issued ASU No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The ASU requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by this ASU. In August 2015, the FASB issued ASU No. 2015-15, Interest—Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements, which clarifies that the SEC staff would not object to an entity deferring and presenting debt issuance costs as an asset and subsequently amortizing the deferred debt issuance costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. The Company adopted this guidance retrospectively beginning in the first quarter of 2016 and the adoption did not have a material effect on its condensed consolidated financial statements for the prior periods or the current period reported. Recent Accounting Pronouncements Not Yet Effective In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which requires measurement and recognition of expected credit losses for certain types of financial assets held. ASU 2016-13 is effective for the Company in its first quarter of 2020, and earlier adoption is permitted beginning in the first quarter of 2019. The Company is currently evaluating the impact of ASU 2016-13 on its consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. This ASU simplifies several aspects of the accounting for share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the statement of cash flows. The guidance is effective for the Company beginning in the first quarter of 2017, with early application permitted. The Company is currently assessing the effect the guidance will have on its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). Under the new guidance, a lessee will be required to recognize assets and liabilities for both finance, or capital, and operating leases with lease terms of more than 12 months. The ASU also will require disclosures to help investors and other financial statement users better understand the amount, timing, and uncertainty of cash flows arising from leases. Lessor accounting will remain largely unchanged from current GAAP. In transition, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach that includes a number of optional practical expedients that entities may elect to apply. This guidance is effective for the Company beginning in the first quarter of 2019. Early adoption is permitted. The Company is currently assessing the effect the adoption of this standard will have on its consolidated financial statements. In August 2014, the FASB issued ASU No. 2014-15, Presentation of Financial Statements—Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern. The new guidance requires management of public and private companies to evaluate whether there is substantial doubt about the entity’s ability to continue as a going concern and, if so, disclose that fact. Management will also be required to evaluate and disclose whether its plans alleviate that doubt. The standard will be effective for the Company's annual period ending December 31, 2016 and interim and annual periods thereafter. Early adoption is permitted. The Company does not expect that the requirement will have an impact on its financial position, results of operations or cash flows. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers: Topic 606 and issued subsequent amendments to the initial guidance in August 2015, March 2016, April 2016 and May 2016 within ASU 2015-04, ASU 2016-08, ASU 2016-10 and ASU 2016-12, respectively (ASU 2014-09, ASU 2015-04, ASU 2016-08, ASU 2016-10 and ASU 2016-12 collectively, Topic 606). Topic 606 requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers and will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. Topic 606 defines a five-step process to achieve this core principle and, in doing so, it is possible more judgment and estimates may be required within the revenue recognition process than are required under existing GAAP. Topic 606 is effective for the Company's annual and interim reporting periods beginning January 1, 2018 using either a retrospective or a cumulative effect transition method. The Company has not yet selected a transition method or determined the effect of these ASUs on its ongoing financial reporting.

Fair Value Measurements

6 Months Ended

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements

2. Fair Value Measurements

The Company carries cash equivalents consisting of money market funds at fair value on a recurring basis. Fair value is based on the price that would be received from selling an asset in an orderly transaction between market participants at the measurement date. Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement:

Level 1 — Observable inputs which include unadjusted quoted prices in active markets for identical assets.

Level 2 — Observable inputs other than Level 1 inputs, such as quoted prices for similar assets, quoted prices for identical or similar assets in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset.

Level 3 — Unobservable inputs that are supported by little or no market activity and that are based on management’s assumptions, including fair value measurements determined by using pricing models, discounted cash flow methodologies or similar techniques.

The fair value of assets carried at fair value was determined using the following inputs (in thousands):



	June 30, 2016
	Total		Level 1
Assets
Cash equivalents
Money market funds	$	20,047	$	20,047

	December 31, 2015
	Total		Level 1
Assets
Cash equivalents
Money market funds	$	20,010	$	20,010

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Financial Statement Components

6 Months Ended

Jun. 30, 2016

Financial Statement Components [Abstract]

Financial Statement Components

3. Financial Statement Components

Cash and cash equivalents consisted of the following (in thousands):



	June 30, 2016		December 31, 2015
Cash	$	37,591	$	38,474
Money market funds	20,047		20,010
Cash and cash equivalents	$	57,638	$	58,484

Accounts receivable, net consisted of the following (in thousands):



	June 30, 2016			December 31, 2015
Trade accounts receivable	$	9,901		$	9,554
Unbilled trade accounts receivable, net of advance client deposits	872			1,028
Allowance for doubtful accounts	(8		)	(15		)
Accounts receivable, net	$	10,765		$	10,567

Prepaid expenses and other current assets consisted of the following (in thousands):



	June 30, 2016		December 31, 2015
Prepaid expenses	$	3,034	$	1,800
Other current assets	356		384
Prepaid expenses and other current assets	$	3,390	$	2,184

Property and equipment, net consisted of the following (in thousands):



	June 30, 2016			December 31, 2015
Computer and network equipment	$	33,358		$	30,277
Computer software	4,008			3,566
Internal-use software development costs	453			128
Furniture and fixtures	1,130			1,113
Leasehold improvements	622			619
Property and equipment	39,571			35,703
Accumulated depreciation and amortization	(26,383		)	(22,478		)
Property and equipment, net	$	13,188		$	13,225

Depreciation and amortization expense associated with property and equipment was $1.9 million and $3.9 million for the three and six months ended June 30, 2016, respectively, and $1.8 million and $3.4 million for the three and six months ended June 30, 2015, respectively.

Property and equipment capitalized under capital lease obligations consist primarily of computer and network equipment and were as follows (in thousands):



	June 30, 2016			December 31, 2015
Gross	$	30,648		$	27,302
Less: accumulated depreciation and amortization	(19,794		)	(16,429		)
Total	$	10,854		$	10,873

Accrued and other current liabilities consisted of the following (in thousands):



	June 30, 2016		December 31, 2015
Accrued compensation and benefits	$	6,675	$	5,718
Accrued expenses	2,478		2,193
Accrued and other current liabilities	$	9,153	$	7,911

Intangible Assets

6 Months Ended

Jun. 30, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

4. Intangible Assets

The components of intangible assets were as follows (in thousands):



	June 30, 2016							December 31, 2015
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Developed technology	$	2,460	$	(951	)	$	1,509	$	2,460	$	(775	)	$	1,685
Customer relationships	520		(281		)	239		520		(229		)	291
Domain names	50		(27		)	23		50		(22		)	28
Non-compete agreements	140		(126		)	14		140		(103		)	37
Total	$	3,170	$	(1,385	)	$	1,785	$	3,170	$	(1,129	)	$	2,041

Amortization expense related to intangible assets was $0.1 million and $0.3 million for the three and six months ended June 30, 2016, respectively, and $0.1 million and $0.3 million for the three and six months ended June 30, 2015, respectively.

As of June 30, 2016, the expected future amortization expense for intangible assets was as follows (in thousands):



Period	Expected Future Amortization Expense
Remainder of 2016	$	247
2017	465
2018	442
2019	351
2020	280
Total	$	1,785

Debt

6 Months Ended

Jun. 30, 2016

Debt Disclosure [Abstract]

Debt

5. Debt

2013 Loan and Security Agreement

Prior to the effectiveness of the 2016 Loan and Security Agreement that was entered into on August 1, 2016 (see Note 11), the Company had a revolving line of credit of up to $20.0 million (“Prior Revolving Credit Facility”) under a loan and security agreement with a lender, which was entered into in March 2013 and last amended in December 2014 (“2013 Loan and Security Agreement”). The Prior Revolving Credit Facility carried a variable annual interest rate of the prime rate plus 0.50% and would mature on December 1, 2016.

The 2013 Loan and Security Agreement was collateralized by substantially all the assets of the Company. The balance outstanding cannot exceed the lesser of (i) $20.0 million or (ii) an amount equal to the Company’s monthly recurring revenue for the three months prior multiplied by the average Dollar-Based Retention Rate over the prior twelve months, less the amount accrued for the Company’s Universal Service Fund (“USF”) obligation (accrued federal fees). As of June 30, 2016 and December 31, 2015, the outstanding principal balance under the Prior Revolving Credit Facility was $12.5 million, which is disclosed as a current liability, and the amount available for additional borrowings was $7.5 million.

In connection with its acquisition of SoCoCare in October 2013, the Company also borrowed $5.0 million under a term loan (the “Term Loan”) under the 2013 Loan and Security Agreement in October 2013. Monthly interest-only payments were due on the advance at the prime rate plus 1.50% through September 2014. Principal and interest payments were due in equal monthly installments from October 2014 through the maturity of the Term Loan in March 2017. As of June 30, 2016 and December 31, 2015, approximately $1.5 million and $2.5 million, respectively, in principal amount of this Term Loan was outstanding and is included as notes payable in the condensed consolidated balance sheets.

The 2013 Loan and Security Agreement contained certain covenants, including the requirement that the Company maintain $7.5 million of cash deposited with the lender for the term of the 2013 Loan and Security Agreement. The Company was in compliance with these covenants as of June 30, 2016. The 2013 Loan and Security Agreement remained senior to other debt, including the debt issued under the 2014 Loan and Security Agreement discussed below.

2014 Loan and Security Agreement

Prior to the effectiveness of the 2016 Loan and Security Agreement that was entered into on August 1, 2016 (see Note 11), the Company had a term loan facility of $30.0 million with a syndicate of two lenders (“Lenders”), which was entered into in February 2014 and amended in December 2014 and February 2015 (the “2014 Loan and Security Agreement”). The term loan facility was available to the Company in tranches. The first tranche for $20.0 million was advanced upon the closing of the agreement. The remaining $10.0 million was available for drawdown by the Company until February 20, 2016 in $1.0 million increments, which expired on February 20, 2016. The Company incurred $0.4 million in debt costs in connection with borrowing the first tranche in February 2014. The term loan bore interest at a variable per annum rate equal to the greater of 10% or LIBOR plus 9%. Interest was due and payable on the last business day of each month during the term of the loan commencing in February 2014. Monthly principal payments were due beginning in February 2016 based on 1/60th of the outstanding balance at that time and would continue until all remaining principal outstanding under the term loan becomes due and payable in February 2019. As of June 30, 2016 and December 31, 2015, respectively, $18.3 million and $20.0 million of this loan facility was outstanding and is included as notes payable in the condensed consolidated balance sheets.

The term loan was secured by substantially all the assets of the Company and was subordinate to the 2013 Loan and Security Agreement. The 2014 Loan and Security Agreement contained certain covenants and included the occurrence of a material adverse event, as defined in the agreement and determined by the Lenders, as an event of default. As of June 30, 2016, the Company was in compliance with these covenants.

In connection with entering into the 2014 Loan and Security Agreement, the Company issued to the Lenders warrants to purchase 177,865 shares of common stock at $10.12 per share, which vest and become exercisable over a ten year term from the date of issuance, based on amounts drawn under the $30.0 million term loan facility. Based on the drawdown of $20.0 million in February 2014, 118,577 shares of common stock issuable under the warrants vested and are exercisable by the Lenders. The fair value of these vested warrants of $1.0 million was recorded as a discount against the debt proceeds and was being recognized as additional interest expense over the term of the loan. The remaining 59,288 shares of common stock issuable under the warrants pertaining to the undrawn $10.0 million did not vest and were no longer exercisable on February 20, 2016 when the $10.0 million was no longer available for borrowing.

Promissory Note

In July 2013, the Company issued a promissory note to the Universal Service Administrative Company ("USAC") for $4.1 million as a financing arrangement for that amount of accrued federal fees. The promissory note carried a fixed annual interest rate of 12.75% and was repayable in 42 equal monthly installments of principal and interest beginning in August 2013. As of June 30, 2016 and December 31, 2015, approximately $0.8 million and $1.5 million, respectively, of this promissory note was outstanding and is included as notes payable in the accompanying condensed consolidated balance sheets.

FCC Civil Penalty

In June 2015, the Company entered into a consent decree with the Federal Communications Commission ("FCC") Enforcement Bureau (Note 9), in which the Company agreed to pay a civil penalty of $2.0 million to the U.S. Treasury in twelve equal quarterly installments starting in July 2015 without interest. As a result, the Company discounted the $2.0 million liability, which was accrued in the third quarter of 2014 for the then tentative civil penalty, to its present value of $1.7 million at an annual interest rate of 12.75% to reflect the imputed interest and reclassified this discounted liability from 'Accrued federal fees' to 'Notes payable.' The $0.3 million discount was recorded as a reduction to general and administrative expense in the three months ended June 30, 2015 and is being recognized as interest expense over the payment term of the civil penalty. As of June 30, 2016 and December 31, 2015, the outstanding civil penalty payable was $1.3 million and $1.7 million, respectively, of which the net carrying value was $1.2 million and $1.4 million, respectively, and are included as 'Notes payable' in the accompanying condensed consolidated balance sheets.

As of June 30, 2016 and December 31, 2015, the Company’s outstanding debt is summarized as follows (in thousands):



	June 30, 2016			December 31, 2015
Term loan under 2014 Loan and Security Agreement	$	18,333		$	20,000
Term loan under 2013 Loan and Security Agreement	1,500			2,500
Promissory note to USAC	811			1,459
FCC civil penalty	1,333			1,667
Total notes payable, gross	21,977			25,626
Less: discount	(829		)	(1,087		)
Total notes payable, net carrying value	21,148			24,539
Revolving line of credit	12,500			12,500
Total debt, net carrying value	$	33,648		$	37,039
Less: current portion of debt *	(19,076		)	(19,712		)
Total debt, less current portion **	14,572			17,327


* Included in ‘Revolving line of credit’ and ‘Notes payable’ in the condensed consolidated balance sheets.
** Included in ‘Notes payable - less current portion’ in the condensed consolidated balance sheets.

Future principal payments of the Company’s outstanding debt as of June 30, 2016 are as follows (in thousands):



Period	Amount to Mature
Remainder of 2016	$	16,524
2017	5,286
2018	4,334
2019	8,333
Total	$	34,477

Stockholders' Equity

6 Months Ended

Jun. 30, 2016

Equity [Abstract]

Stockholders' Equity

6. Stockholders’ Equity

Capital Structure

The Company is authorized to issue 450,000,000 shares of common stock with a par value of $0.001 per share. As of June 30, 2016 and December 31, 2015, the Company had 52,554,124 shares and 51,164,621 shares of common stock issued and outstanding, respectively.

The Company is also authorized to designate and issue up to 5,000,000 shares of preferred stock with a par value of $0.001 per share in one or more series without stockholder approval and to fix the rights, preferences, privileges and restrictions thereof. As of June 30, 2016 and December 31, 2015, the Company had no shares of preferred stock issued and outstanding.

Warrants

As of June 30, 2016 and December 31, 2015, the Company had outstanding warrants to purchase 131,597 shares and 190,885 shares of common stock, respectively, with a weighted-average exercise price of $9.89 per share and $9.96 per share, respectively. These warrants expire primarily in October 2023 and February 2024.

Common Stock Reserved for Future Issuance

Shares of common stock reserved for future issuance related to outstanding equity awards, common stock warrants, and employee equity incentive plans were as follows (in thousands):



		June 30, 2016
Stock options outstanding		5,831
Restricted stock units outstanding		2,228
Shares available for future grant under 2014 Plan		6,263
Shares available for future issuance under ESPP		1,258
Common stock warrants outstanding		132
Total shares of common stock reserved		15,712

Equity Incentive Plans

Prior to its initial public offering (“IPO”), the Company granted stock options under its Amended and Restated 2004 Equity Incentive Plan, as amended (the “2004 Plan”).

In March 2014, the Company’s board of directors and stockholders approved the 2014 Equity Incentive Plan (“2014 Plan”) and 5,300,000 shares of common stock were reserved for issuance under the 2014 Plan. In addition, on the first day of each year beginning in 2015 and ending in 2024, the 2014 Plan provides for an annual automatic increase to the shares reserved for issuance in an amount equal to 5% of the total number of shares outstanding on December 31st of the preceding calendar year or a lesser number as determined by the Company’s board of directors. Pursuant to the automatic annual increase, 2,558,231 and 2,466,124 additional shares were reserved under the 2014 Plan on January 1, 2016 and 2015, respectively.

No further grants were made under the 2004 Plan once the 2014 Plan became effective on April 3, 2014. Upon the effectiveness of the 2014 Plan, all shares reserved for future issuance under the 2004 Plan became available for issuance under the 2014 Plan. After the IPO, any forfeited or expired shares that would have otherwise returned to the 2004 Plan instead return to the 2014 Plan. As of June 30, 2016, 6,263,141 shares of common stock were available for future grant under the 2014 Plan.

The 2004 Plan and the 2014 Plan are described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015.

Stock Options

A summary of the Company’s stock option activity during the six months ended June 30, 2016 is as follows (in thousands, except years and per share data):



	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
Outstanding as of December 31, 2015	6,092		$	4.58
Options granted (weighted average grant date fair value of $4.00 per share)	724		8.54
Options exercised	(713	)	4.70
Options forfeited or expired	(272	)	6.80
Outstanding as of June 30, 2016	5,831		$	4.95	6.4	$	40,709

The Company has computed the aggregate intrinsic value amounts disclosed in the above table based on the difference between the exercise price of the options and the closing market price of the Company’s common stock of $11.90 per share as of June 30, 2016 for all in-the-money options outstanding.

Restricted Stock Units

A summary of the Company's restricted stock unit ("RSU") activity during the six months ended June 30, 2016 is as follows (in thousands, except per share data):



	Number of Shares		Weighted Average Grant Date Fair Value Per Share
Outstanding as of December 31, 2015	1,818		$	5.01
RSUs granted	1,005		8.45
RSUs vested and released	(512	)	5.31
RSUs forfeited	(83	)	5.64
Outstanding as of June 30, 2016	2,228		$	6.47

Employee Stock Purchase Plan

The Company's 2014 Employee Stock Purchase Plan ("ESPP") became effective on April 3, 2014 and is described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015. The number of shares of common stock originally reserved for issuance under the ESPP was 880,000 shares, which will increase automatically each year, beginning on January 1, 2015 and continuing through January 1, 2024, by the lesser of (i) 1% of the total number of shares of the Company’s common stock outstanding on December 31 of the preceding calendar year; (ii) 1,000,000 shares of common stock (subject to adjustment to reflect any split or combination of the Company’s common stock); or (iii) such lesser number as determined by the Company’s board of directors. Pursuant to the automatic annual increase, 511,646 additional shares were reserved under the ESPP on January 1, 2016. As of June 30, 2016, 1,258,442 shares of common stock were available for future grants under the ESPP.

During the three and six months ended June 30, 2016, 164,310 shares were purchased on May 13, 2016 at a price of $4.82 per share under the ESPP.

Stock-Based Compensation

Stock-based compensation expenses for the three and six months ended June 30, 2016 and 2015 were as follows (in thousands):



	Three Months Ended				Six Months Ended
	June 30, 2016		June 30, 2015		June 30, 2016		June 30, 2015
Cost of revenue	$	329	$	218	$	594	$	406
Research and development	528		340		963		914
Sales and marketing	544		458		978		982
General and administrative	1,013		814		1,873		1,763
Total stock-based compensation	$	2,414	$	1,830	$	4,408	$	4,065

As of June 30, 2016, unrecognized stock-based compensation expenses by award type, net of estimated forfeitures, and their expected weighted-average recognition periods are summarized in the following table (in thousands, except years).



	Stock Option		RSU		ESPP
Unrecognized stock-based compensation expense	$	6,951	$	12,218	$	328
Weighted-average amortization period	2.4 years		3.0 years		0.4 years

The Company recognizes stock-based compensation expense that is calculated based upon awards ultimately expected to vest and, thus, stock-based compensation expense is reduced for estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. All stock-based compensation for equity awards granted to employees and non-employee directors is measured based on the grant date fair value of the award.

The Company values RSUs at the closing market price of its common stock on the date of grant. The Company estimates the fair value of each stock option and purchase right under the ESPP granted to employees on the date of grant using the Black-Scholes option-pricing model and using the assumptions noted in the below table. The weighted-average assumptions used to value stock options granted during the three and six months ended June 30, 2016 and 2015 were as follows:



Stock Options	Three Months Ended		Six Months Ended
	June 30, 2016	June 30, 2015	June 30, 2016	June 30, 2015
Expected term (years)	6.1	6.1	6.0	6.1
Volatility	48%	49%	48%	49%
Risk-free interest rate	1.2%	1.5%	1.5%	1.5%
Dividend yield	—	—	—	—

Net Loss Per Share

6 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

Net Loss Per Share

7. Net Loss Per Share

Basic net loss per share is calculated by dividing net loss by the weighted average number of common shares outstanding during the period, and excludes any dilutive effects of employee stock-based awards and warrants. Diluted net income per share is computed giving effect to all potentially dilutive common shares, including common stock issuable upon exercise of stock options and warrants and vesting of restricted stock. As the Company had net losses for the three and six months ended June 30, 2016 and 2015, all potentially issuable common shares were determined to be anti-dilutive.

The following table presents the calculation of basic and diluted net loss per share (in thousands, except per share data).



	Three Months Ended						Six Months Ended
	June 30, 2016			June 30, 2015			June 30, 2016			June 30, 2015
Net loss	$	(3,468	)	$	(7,369	)	$	(8,379	)	$	(16,272	)
Weighted-average shares used in computing basic and diluted net loss per share	52,143			49,980			51,760			49,708
Basic and diluted net loss per share	$	(0.07	)	$	(0.15	)	$	(0.16	)	$	(0.33	)

The following securities were excluded from the calculation of diluted net loss per share attributable to common stockholders because their effect would have been anti-dilutive for the periods presented (in thousands).



	June 30, 2016	June 30, 2015
Stock options	5,831	6,775
Restricted stock units	2,228	1,526
ESPP	147	178
Common stock warrants	132	360
Total	8,338	8,839

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	8. Income Taxes The provision for income taxes for the three and six months ended June 30, 2016 was approximately $42 thousand and $70 thousand, respectively. The benefit from income taxes for the three and six months ended June 30, 2015 was approximately $20 thousand and $2 thousand, respectively. The provision for or benefit from income taxes consisted primarily of foreign income taxes. For the three and six months ended June 30, 2016 and 2015, the provision for or benefit from income taxes differed from the statutory amount primarily due to the Company realizing no benefit for current year losses due to maintaining a full valuation allowance against its domestic net deferred tax assets. The realization of tax benefits of deferred tax assets is dependent upon future levels of taxable income, of an appropriate character, in the periods the items are expected to be deductible or taxable. Based on the available objective evidence, the Company does not believe it is more likely than not that the net deferred tax assets will be realizable. Accordingly, the Company has provided a full valuation allowance against the domestic net deferred tax assets as of June 30, 2016 and December 31, 2015. The Company intends to maintain the remaining valuation allowance until sufficient positive evidence exists to support a reversal of, or decrease in, the valuation allowance. During the three and six months ended June 30, 2016, there were no material changes to the total amount of unrecognized tax benefits.

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	9. Commitments and Contingencies Commitments The Company’s principal commitments consist of future payment obligations under capital leases to finance data centers and other computer and networking equipment purchases, operating lease agreements for office space, research and development, and sales and marketing facilities, and agreements with third parties to provide co-location hosting, telecommunication usage and equipment maintenance services. These commitments as of December 31, 2015 are disclosed in the Company's Annual Report on Form 10-K for the year ended December 31, 2015, and did not change materially during the six months ended June 30, 2016 except for the acquisition of certain additional data center and network equipment and software under multiple capital leases. As of June 30, 2016, the total minimum future payment commitments under these capital leases added during the six months ended June 30, 2016 were approximately $3.8 million, of which $0.8 million is due in 2016, with the remainder due over approximately 31 months. Universal Services Fund Liability During the third quarter of 2012, the Company determined that based on its business activities, it is classified as a telecommunications service provider for regulatory purposes and it should make direct contributions to the federal USF and related funds based on revenues it receives from the resale of interstate and international telecommunications services. Previously, the Company had believed that the telecommunications services were an integral part of an information service that the Company provides via its software and had instead made indirect USF contributions via payments to its wholesale telecommunications service providers. In order to comply with the obligation to make direct contributions, the Company made a voluntary self-disclosure to the FCC Enforcement Bureau and registered with the USAC, which is charged by the FCC with administering the USF. The Company filed exemption certificates with its wholesale telecommunications service providers in order to eliminate its obligation to reimburse such wholesale telecommunications service providers for their USF contributions calculated on services sold to the Company. The Company’s registration with USAC subjects it to assessments for unpaid USF contributions, as well as interest thereon and civil penalties, due to its late registration and past failure to recognize its obligation as a USF contributor and as an international carrier. The Company will be required to pay assessments for periods prior to the Company’s registration. As of December 31, 2012, the total past due USF contribution being imposed by USAC and accrued by the Company for the period from 2003 through 2012 was $8.1 million, of which $4.7 million was undisputed and $3.4 million, including $0.8 million that pertains to 2003 through 2007, was disputed. While the Company is in administrative proceedings before the FCC to limit such back assessments to the period 2008 through 2012, it is possible that it will be required to pay back assessments for the period from 2003 through 2007. In 2013, the Company began remitting required contributions on a prospective basis directly to USAC. In July 2013, the Company and USAC agreed to a financing arrangement for $4.1 million of the undisputed $4.7 million of the unpaid USF contributions whereby the Company issued to USAC a promissory note payable in the principal amount of the $4.1 million and paid off the remaining undisputed $0.6 million. The repayment terms of the promissory note payable are disclosed in Note 5. As of June 30, 2016 and December 31, 2015, the principal balance of the promissory note payable was $0.8 million and $1.5 million, respectively, and is included in the notes payable amounts on the condensed consolidated balance sheets. In addition to the promissory note payable, as of June 30, 2016 and December 31, 2015, the Company had an accrued liability for the disputed portion of the unpaid USF contributions and estimated interest and penalties of $5.1 million and $4.9 million, respectively, included in accrued federal fees on the condensed consolidated balance sheets. For the three and six months ended June 30, 2016, the Company recorded interest and penalty expenses of $0.1 million and $0.3 million as a charge to general and administrative expense, which were related to its disputed unpaid USF obligations. On June 12, 2015, in connection with the Company’s disclosure to the FCC, the Company entered into a consent decree with the FCC Enforcement Bureau. In the consent decree, the Company agreed to pay a civil penalty of $2.0 million to the U.S. Treasury in twelve equal quarterly installments starting in July 2015 without interest (Note 5). In the third quarter of 2014, the Company accrued a $2.0 million liability for the then tentative civil penalty. The consent decree also requires the Company to adopt certain internal regulatory compliance monitoring and training requirements, and to report on the status of those compliance efforts to the FCC’s Enforcement Bureau for three years. The Company’s implementation of the internal regulatory compliance monitoring and training requirements were completed in August 2015, and its annual compliance reporting to the FCC will continue until June 2018. State and Local Taxes and Surcharges In April 2012, the Company commenced collecting and remitting sales taxes on sales of subscription services in all the U.S. states in which it determined it was obligated to do so. During the first quarter of 2015, the Company conducted an updated sales tax review of the taxability of sales of its subscription services. As a result, the Company determined that it may be obligated to collect and remit sales taxes on such sales in four additional states. Based on its best estimate of the probable sales tax liability in those four states relating to its sales of subscription services during the period 2011 through 2014, during the three months ended March 31, 2015, the Company recorded a general and administrative expense of $0.6 million as an immaterial out of period adjustment to accrue for such taxes. During 2013, the Company analyzed its activities and determined it may be obligated to collect and remit various state and local taxes and surcharges on its usage-based fees. The Company had not remitted state and local taxes on usage-based fees in any of the periods prior to 2014 and therefore accrued a sales tax liability for this contingency. In January 2014, the Company commenced paying such taxes and surcharges to certain state authorities. In June 2014, the Company commenced collecting state and local taxes or surcharges on usage-based fees from its clients on a current basis and remitting such taxes to the applicable U.S. state taxing authorities. During the three months ended June 30, 2016 and 2015, respectively, the Company remitted $25 thousand and $0.9 million for its contingent sales taxes on both usage-based fees and sales of subscription services. During the six months ended June 30, 2016 and 2015, the Company has remitted $0.3 million and $0.9 million, respectively, for its contingent sales taxes on both usage-based fees and sales of subscription services. The Company recognized a $0.2 million gain and a $0.2 million gain for the three and six months ended June 30, 2016, respectively, and $0.3 million expense and $1.0 million expense for the three and six months ended June 30, 2015, respectively, as general and administrative expense related to its estimated sales tax liability on both usage-based fees and sales of subscription services in the U.S. and Canada, which was not being collected from its clients. As of June 30, 2016 and December 31, 2015, the Company had total accrued liabilities of $2.2 million and $2.7 million, respectively, for such contingent sales taxes and surcharges that were not being collected from its clients but may be imposed by various taxing authorities, of which $0.3 million and $0.8 million were included in current “Sales tax liability” on the condensed consolidated balance sheets, respectively, and the remaining were included in non-current “Sales tax liability” on the condensed consolidated balance sheets. The Company’s estimate of the probable loss incurred under this contingency is based on its analysis of the source location of its usage-based fees and the regulations and rules in each tax jurisdiction. Legal Matters The Company is involved in various legal and regulatory matters arising in the normal course of business. In management’s opinion, resolution of these matters is not expected to have a material impact on the Company’s consolidated results of operations, cash flows, or its financial position. However, due to the uncertain nature of legal matters, an unfavorable resolution of a matter could materially affect the Company’s future consolidated results of operations, cash flows or financial position in a particular period. The Company is currently involved in the following lawsuit as a defendant. NobelBiz Litigation On August 5, 2011, NobelBiz sent a letter to the Company asserting infringement of a patent related to virtual call centers. On April 3, 2012, NobelBiz filed a patent infringement lawsuit against the Company in the United States District Court for the Eastern District of Texas. The patent asserted in the complaint is different, but related, to the patent asserted in the original letter. The lawsuit, NobelBiz Inc. v. Five9, Inc., Case No. 6:12-cv-00243-LED, alleges that the Company’s local caller ID management service infringes United States Patent No. 8,135,122, or the ‘122 patent. The ‘122 patent, titled “System and Method for Modifying Communication Information (MCI),” issued on March 13, 2012, and according to the complaint is alleged to relate to “a system for processing a telephone call from a call originator (also referred to as a calling party) to a call target (also referred to as a receiving party), where the system accesses a database storing outgoing telephone numbers, selects a replacement telephone number from the outgoing telephone numbers based on the telephone number of the call target, and originates an outbound call to the call target with a modified outgoing caller identification (‘caller ID’).” NobelBiz seeks damages in the form of lost profits as well as injunctive relief. The lawsuit is one of several lawsuits filed by NobelBiz against various companies including TCN Inc., LiveVox, Inc. and Global Connect LLC. On March 28, 2013, the court granted the Company’s motion to transfer the case to the United States District Court for the Northern District of California. Subsequently, NobelBiz amended its complaint to add claims related to U.S. Patent No. 8,565,399, or the ‘399 patent, which is a continuation in the same family as the ‘122 patent and addresses the same technology. The Company responded to the complaint and amended complaint by asserting noninfringement and invalidity of the ‘122 and ‘399 patents. On January 16, 2015, the court issued an order regarding claim construction of the two patents-in-suit. On March 7, 2016, the court stayed the case pending an appeal in lawsuits involving NobelBiz, Global Connect and TCN that also involve the ‘122 and ‘399 patents. The appeal for those cases is likely to last until late 2016 or into 2017, after which time the lawsuit between NobelBiz and Five9 will resume and a new schedule will be entered by the Court. The Company has investigated the claims alleged in the complaint and believes that it has good defenses to the claims. While the Company does not believe that it is probable that a loss has been incurred, the ultimate resolution of the matter could potentially result in a loss. Management’s best estimate of the low end of the range of the potential loss is zero. At this time, it is not possible to reasonably estimate the high end of the range of the potential loss, which could be material to the Company’s results of operations. Accordingly, the Company has not accrued a loss related to this matter. Indemnification Agreements In the ordinary course of business, the Company may provide indemnification of varying scope and terms to clients, vendors, lessors, business partners and other parties with respect to certain matters, including, but not limited to, losses arising out of breach of such agreements, services to be provided by the Company or from intellectual property infringement claims made by third parties. In addition, the Company has entered into indemnification agreements with its directors, officers and certain employees that require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors, officers or employees. No demands have been made upon the Company to provide indemnification under such agreements and thus there are no claims that the Company is aware of that would have a material effect on the Company’s condensed consolidated balance sheets, condensed consolidated statements of operations and comprehensive loss, or condensed consolidated statements of cash flows.

Geographical Information

6 Months Ended

Jun. 30, 2016

Segment Reporting [Abstract]

Geographical Information

10. Geographical Information

The following table is a summary of revenues by geographic region based on client billing address and has been estimated based on the amounts billed to clients during the periods (in thousands).



	Three Months Ended				Six Months Ended
	June 30, 2016		June 30, 2015		June 30, 2016		June 30, 2015
United States	$	36,104	$	28,088	$	71,697	$	56,367
International	2,782		2,186		5,204		4,181
Total revenue	$	38,886	$	30,274	$	76,901	$	60,548

The following table summarizes total property and equipment, net in the respective locations (in thousands).



	June 30, 2016		December 31, 2015
United States	$	11,178	$	10,939
International	2,010		2,286
Property and equipment, net	$	13,188	$	13,225

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2016
Subsequent Events [Abstract]
Subsequent Events	11. Subsequent Events 2016 Loan and Security Agreement On August 1, 2016, the Company entered into a loan and security agreement (the “2016 Loan and Security Agreement”) with two lenders for a revolving line of credit (the “New Revolving Credit Facility”) of up to $50.0 million. The New Revolving Credit Facility matures in August 2019. The New Revolving Credit Facility carries a variable annual interest rate of the prime rate plus 0.50% or the prime rate plus 0.75% if our adjusted EBITDA is negative at the end of any fiscal quarter. Upon the effectiveness of the 2016 Loan and Security Agreement, the Company immediately drew down $32.6 million and terminated the 2013 Loan and Security Agreement and the 2014 Loan and Security Agreement by repaying the aggregate outstanding principal, accrued interest and prepayment penalty balances thereunder of $32.4 million along with $0.2 million in administrative fees.

Description of Business and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015. All intercompany transactions and balances have been eliminated in consolidation.
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. The significant estimates made by management affect revenue, the allowance for doubtful accounts, intangible assets, goodwill, loss contingencies, including the Company’s accrual for federal fees and sales tax liability, accrued liabilities, stock-based compensation, provision for income taxes and uncertain tax positions. Management periodically evaluates such estimates and they are adjusted prospectively based upon such periodic evaluation. Actual results could differ from those estimates.
Recently Adopted Accounting Pronouncements and Recent Accounting Pronouncements Not Yet Effective	Recently Adopted Accounting Pronouncements In November 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2015-17, Balance Sheet Classification of Deferred Taxes. This ASU eliminates the requirement for companies to present deferred tax assets and liabilities as current and noncurrent on the balance sheet and, instead, requires companies to classify all deferred tax assets and liabilities as noncurrent. As permitted by ASU 2015-17, the Company early-adopted this new guidance at the beginning of the fourth quarter of 2015 and applied it prospectively. No prior periods were retrospectively adjusted. In April 2015, the FASB issued ASU No. 2015-05, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement. The ASU provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The ASU does not change the accounting for a customer’s accounting for service contracts. A company can elect to adopt the ASU either prospectively or retrospectively. The Company adopted this guidance prospectively beginning in the first quarter of 2016 and the adoption did not have a material effect on its condensed consolidated financial statements. In April 2015, the FASB issued ASU No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The ASU requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by this ASU. In August 2015, the FASB issued ASU No. 2015-15, Interest—Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements, which clarifies that the SEC staff would not object to an entity deferring and presenting debt issuance costs as an asset and subsequently amortizing the deferred debt issuance costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. The Company adopted this guidance retrospectively beginning in the first quarter of 2016 and the adoption did not have a material effect on its condensed consolidated financial statements for the prior periods or the current period reported. Recent Accounting Pronouncements Not Yet Effective In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which requires measurement and recognition of expected credit losses for certain types of financial assets held. ASU 2016-13 is effective for the Company in its first quarter of 2020, and earlier adoption is permitted beginning in the first quarter of 2019. The Company is currently evaluating the impact of ASU 2016-13 on its consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. This ASU simplifies several aspects of the accounting for share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the statement of cash flows. The guidance is effective for the Company beginning in the first quarter of 2017, with early application permitted. The Company is currently assessing the effect the guidance will have on its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). Under the new guidance, a lessee will be required to recognize assets and liabilities for both finance, or capital, and operating leases with lease terms of more than 12 months. The ASU also will require disclosures to help investors and other financial statement users better understand the amount, timing, and uncertainty of cash flows arising from leases. Lessor accounting will remain largely unchanged from current GAAP. In transition, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach that includes a number of optional practical expedients that entities may elect to apply. This guidance is effective for the Company beginning in the first quarter of 2019. Early adoption is permitted. The Company is currently assessing the effect the adoption of this standard will have on its consolidated financial statements. In August 2014, the FASB issued ASU No. 2014-15, Presentation of Financial Statements—Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern. The new guidance requires management of public and private companies to evaluate whether there is substantial doubt about the entity’s ability to continue as a going concern and, if so, disclose that fact. Management will also be required to evaluate and disclose whether its plans alleviate that doubt. The standard will be effective for the Company's annual period ending December 31, 2016 and interim and annual periods thereafter. Early adoption is permitted. The Company does not expect that the requirement will have an impact on its financial position, results of operations or cash flows. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers: Topic 606 and issued subsequent amendments to the initial guidance in August 2015, March 2016, April 2016 and May 2016 within ASU 2015-04, ASU 2016-08, ASU 2016-10 and ASU 2016-12, respectively (ASU 2014-09, ASU 2015-04, ASU 2016-08, ASU 2016-10 and ASU 2016-12 collectively, Topic 606). Topic 606 requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers and will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. Topic 606 defines a five-step process to achieve this core principle and, in doing so, it is possible more judgment and estimates may be required within the revenue recognition process than are required under existing GAAP. Topic 606 is effective for the Company's annual and interim reporting periods beginning January 1, 2018 using either a retrospective or a cumulative effect transition method. The Company has not yet selected a transition method or determined the effect of these ASUs on its ongoing financial reporting.

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Schedule of Assets Carried at Fair Value

The fair value of assets carried at fair value was determined using the following inputs (in thousands):



	June 30, 2016
	Total		Level 1
Assets
Cash equivalents
Money market funds	$	20,047	$	20,047

	December 31, 2015
	Total		Level 1
Assets
Cash equivalents
Money market funds	$	20,010	$	20,010

Financial Statement Components (Tables)

6 Months Ended

Jun. 30, 2016

Financial Statement Components [Abstract]

Schedule of Cash and Cash Equivalents

Cash and cash equivalents consisted of the following (in thousands):



	June 30, 2016		December 31, 2015
Cash	$	37,591	$	38,474
Money market funds	20,047		20,010
Cash and cash equivalents	$	57,638	$	58,484

Schedule of Accounts Receivable

Accounts receivable, net consisted of the following (in thousands):



	June 30, 2016			December 31, 2015
Trade accounts receivable	$	9,901		$	9,554
Unbilled trade accounts receivable, net of advance client deposits	872			1,028
Allowance for doubtful accounts	(8		)	(15		)
Accounts receivable, net	$	10,765		$	10,567

Schedule of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):



	June 30, 2016		December 31, 2015
Prepaid expenses	$	3,034	$	1,800
Other current assets	356		384
Prepaid expenses and other current assets	$	3,390	$	2,184

Schedule of Property and Equipment

Property and equipment, net consisted of the following (in thousands):



	June 30, 2016			December 31, 2015
Computer and network equipment	$	33,358		$	30,277
Computer software	4,008			3,566
Internal-use software development costs	453			128
Furniture and fixtures	1,130			1,113
Leasehold improvements	622			619
Property and equipment	39,571			35,703
Accumulated depreciation and amortization	(26,383		)	(22,478		)
Property and equipment, net	$	13,188		$	13,225

Schedule of Capital Leased Property and Equipment

Property and equipment capitalized under capital lease obligations consist primarily of computer and network equipment and were as follows (in thousands):



	June 30, 2016			December 31, 2015
Gross	$	30,648		$	27,302
Less: accumulated depreciation and amortization	(19,794		)	(16,429		)
Total	$	10,854		$	10,873

Schedule of Accrued and Other Current Liabilities

Accrued and other current liabilities consisted of the following (in thousands):



	June 30, 2016		December 31, 2015
Accrued compensation and benefits	$	6,675	$	5,718
Accrued expenses	2,478		2,193
Accrued and other current liabilities	$	9,153	$	7,911

Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

The components of intangible assets were as follows (in thousands):



	June 30, 2016							December 31, 2015
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Developed technology	$	2,460	$	(951	)	$	1,509	$	2,460	$	(775	)	$	1,685
Customer relationships	520		(281		)	239		520		(229		)	291
Domain names	50		(27		)	23		50		(22		)	28
Non-compete agreements	140		(126		)	14		140		(103		)	37
Total	$	3,170	$	(1,385	)	$	1,785	$	3,170	$	(1,129	)	$	2,041

Schedule of Expected Future Amortization Expense of Intangible Assets

As of June 30, 2016, the expected future amortization expense for intangible assets was as follows (in thousands):



Period	Expected Future Amortization Expense
Remainder of 2016	$	247
2017	465
2018	442
2019	351
2020	280
Total	$	1,785

Debt (Tables)

6 Months Ended

Jun. 30, 2016

Debt Disclosure [Abstract]

Schedule of Outstanding Debt

As of June 30, 2016 and December 31, 2015, the Company’s outstanding debt is summarized as follows (in thousands):



	June 30, 2016			December 31, 2015
Term loan under 2014 Loan and Security Agreement	$	18,333		$	20,000
Term loan under 2013 Loan and Security Agreement	1,500			2,500
Promissory note to USAC	811			1,459
FCC civil penalty	1,333			1,667
Total notes payable, gross	21,977			25,626
Less: discount	(829		)	(1,087		)
Total notes payable, net carrying value	21,148			24,539
Revolving line of credit	12,500			12,500
Total debt, net carrying value	$	33,648		$	37,039
Less: current portion of debt *	(19,076		)	(19,712		)
Total debt, less current portion **	14,572			17,327


* Included in ‘Revolving line of credit’ and ‘Notes payable’ in the condensed consolidated balance sheets.
** Included in ‘Notes payable - less current portion’ in the condensed consolidated balance sheets.

Schedule of Maturities of Debt

Future principal payments of the Company’s outstanding debt as of June 30, 2016 are as follows (in thousands):



Period	Amount to Mature
Remainder of 2016	$	16,524
2017	5,286
2018	4,334
2019	8,333
Total	$	34,477

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

+ Details

Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2016

Equity [Abstract]

Schedule of Common Stock Reserved for Future Issuance

Shares of common stock reserved for future issuance related to outstanding equity awards, common stock warrants, and employee equity incentive plans were as follows (in thousands):



		June 30, 2016
Stock options outstanding		5,831
Restricted stock units outstanding		2,228
Shares available for future grant under 2014 Plan		6,263
Shares available for future issuance under ESPP		1,258
Common stock warrants outstanding		132
Total shares of common stock reserved		15,712

Schedule of Stock Option Activity

A summary of the Company’s stock option activity during the six months ended June 30, 2016 is as follows (in thousands, except years and per share data):



	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
Outstanding as of December 31, 2015	6,092		$	4.58
Options granted (weighted average grant date fair value of $4.00 per share)	724		8.54
Options exercised	(713	)	4.70
Options forfeited or expired	(272	)	6.80
Outstanding as of June 30, 2016	5,831		$	4.95	6.4	$	40,709

Schedule of RSU Activity

A summary of the Company's restricted stock unit ("RSU") activity during the six months ended June 30, 2016 is as follows (in thousands, except per share data):



	Number of Shares		Weighted Average Grant Date Fair Value Per Share
Outstanding as of December 31, 2015	1,818		$	5.01
RSUs granted	1,005		8.45
RSUs vested and released	(512	)	5.31
RSUs forfeited	(83	)	5.64
Outstanding as of June 30, 2016	2,228		$	6.47

Schedule of Stock-based Compensation Expense

Stock-based compensation expenses for the three and six months ended June 30, 2016 and 2015 were as follows (in thousands):



	Three Months Ended				Six Months Ended
	June 30, 2016		June 30, 2015		June 30, 2016		June 30, 2015
Cost of revenue	$	329	$	218	$	594	$	406
Research and development	528		340		963		914
Sales and marketing	544		458		978		982
General and administrative	1,013		814		1,873		1,763
Total stock-based compensation	$	2,414	$	1,830	$	4,408	$	4,065



	Stock Option		RSU		ESPP
Unrecognized stock-based compensation expense	$	6,951	$	12,218	$	328
Weighted-average amortization period	2.4 years		3.0 years		0.4 years

Schedule of Valuation Assumptions, Stock Option

The weighted-average assumptions used to value stock options granted during the three and six months ended June 30, 2016 and 2015 were as follows:



Stock Options	Three Months Ended		Six Months Ended
	June 30, 2016	June 30, 2015	June 30, 2016	June 30, 2015
Expected term (years)	6.1	6.1	6.0	6.1
Volatility	48%	49%	48%	49%
Risk-free interest rate	1.2%	1.5%	1.5%	1.5%
Dividend yield	—	—	—	—

Net Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

Basic and Diluted Net Loss Per Share

The following table presents the calculation of basic and diluted net loss per share (in thousands, except per share data).



	Three Months Ended						Six Months Ended
	June 30, 2016			June 30, 2015			June 30, 2016			June 30, 2015
Net loss	$	(3,468	)	$	(7,369	)	$	(8,379	)	$	(16,272	)
Weighted-average shares used in computing basic and diluted net loss per share	52,143			49,980			51,760			49,708
Basic and diluted net loss per share	$	(0.07	)	$	(0.15	)	$	(0.16	)	$	(0.33	)

Schedule of Antidilutive Securities Excluded from Computation of Net Loss Per Share



	June 30, 2016	June 30, 2015
Stock options	5,831	6,775
Restricted stock units	2,228	1,526
ESPP	147	178
Common stock warrants	132	360
Total	8,338	8,839

Geographical Information (Tables)

6 Months Ended

Jun. 30, 2016

Segment Reporting [Abstract]

Schedule of Revenues and Property and Equipment by Geographic Region

The following table is a summary of revenues by geographic region based on client billing address and has been estimated based on the amounts billed to clients during the periods (in thousands).



	Three Months Ended				Six Months Ended
	June 30, 2016		June 30, 2015		June 30, 2016		June 30, 2015
United States	$	36,104	$	28,088	$	71,697	$	56,367
International	2,782		2,186		5,204		4,181
Total revenue	$	38,886	$	30,274	$	76,901	$	60,548

The following table summarizes total property and equipment, net in the respective locations (in thousands).



	June 30, 2016		December 31, 2015
United States	$	11,178	$	10,939
International	2,010		2,286
Property and equipment, net	$	13,188	$	13,225

Fair Value Measurements - Schedule of Assets Carried at Fair Value (Details) - Money Market Funds - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets
Cash Equivalents	$ 20,047	$ 20,010
Level 1
Assets
Cash Equivalents	$ 20,047	$ 20,010

Financial Statement Components - Schedule of Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Financial Statement Components [Abstract]
Cash	$ 37,591	$ 38,474
Money market funds	20,047	20,010
Cash and cash equivalents	$ 57,638	$ 58,484	$ 65,333	$ 58,289

Financial Statement Components - Schedule of Accounts Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Accounts Receivable [Line Items]
Allowance for doubtful accounts	$ (8)	$ (15)
Accounts receivable, net	10,765	10,567
Trade accounts receivable
Accounts Receivable [Line Items]
Trade accounts receivable	9,901	9,554
Unbilled trade accounts receivable, net of advance client deposits
Accounts Receivable [Line Items]
Trade accounts receivable	$ 872	$ 1,028

Financial Statement Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financial Statement Components [Abstract]
Prepaid expenses	$ 3,034	$ 1,800
Other current assets	356	384
Prepaid expenses and other current assets	$ 3,390	$ 2,184

Financial Statement Components - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment
Property and equipment	$ 39,571	$ 35,703
Accumulated depreciation and amortization	(26,383)	(22,478)
Property and equipment, net	13,188	13,225
Computer and network equipment
Property, Plant and Equipment
Property and equipment	33,358	30,277
Computer software
Property, Plant and Equipment
Property and equipment	4,008	3,566
Internal-use software development costs
Property, Plant and Equipment
Property and equipment	453	128
Furniture and fixtures
Property, Plant and Equipment
Property and equipment	1,130	1,113
Leasehold improvements
Property, Plant and Equipment
Property and equipment	$ 622	$ 619

Financial Statement Components - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Financial Statement Components [Abstract]
Depreciation and amortization expense associated with property and equipment	$ 1.9	$ 1.8	$ 3.9	$ 3.4

Financial Statement Components - Schedule of Capital Leased Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financial Statement Components [Abstract]
Gross	$ 30,648	$ 27,302
Less: accumulated depreciation and amortization	(19,794)	(16,429)
Total	$ 10,854	$ 10,873

Financial Statement Components - Schedule of Accrued and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financial Statement Components [Abstract]
Accrued compensation and benefits	$ 6,675	$ 5,718
Accrued expenses	2,478	2,193
Accrued and other current liabilities	$ 9,153	$ 7,911

Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	$ 3,170	$ 3,170
Accumulated Amortization	(1,385)	(1,129)
Total	1,785	2,041
Developed technology
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	2,460	2,460
Accumulated Amortization	(951)	(775)
Total	1,509	1,685
Customer relationships
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	520	520
Accumulated Amortization	(281)	(229)
Total	239	291
Domain names
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	50	50
Accumulated Amortization	(27)	(22)
Total	23	28
Non-compete agreements
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	140	140
Accumulated Amortization	(126)	(103)
Total	$ 14	$ 37

Intangible Assets - Schedule of Expected Future Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2016	$ 247
2017	465
2018	442
2019	351
2020	280
Total	$ 1,785	$ 2,041

Intangible Assets Intangible Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization expense related to intangible assets	$ 0.1	$ 0.1	$ 0.3	$ 0.3

Debt - 2013 Loan and Security Agreement (Details) - USD ($)	1 Months Ended
	Oct. 31, 2013	Mar. 31, 2013	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Debt, gross			$ 34,477,000
Notes Payable
Debt Instrument [Line Items]
Debt, gross			21,977,000	$ 25,626,000
Notes Payable \| 2013 Loan and Security Agreement
Debt Instrument [Line Items]
Debt, gross			1,500,000	2,500,000
Revolving Credit Facility \| 2013 Loan and Security Agreement
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		$ 20,000,000.0
Credit facility, amount outstanding			12,500,000	12,500,000
Credit facility, remaining borrowing capacity			$ 7,500,000	$ 7,500,000
Covenant terms, minimum required cash on deposit at lender		$ 7,500,000.0
Revolving Credit Facility \| 2013 Loan and Security Agreement \| Prime Rate
Debt Instrument [Line Items]
Debt instrument, basis spread		0.50%
Term Loan \| 2013 Loan and Security Agreement
Debt Instrument [Line Items]
Credit facility, amount borrowed under agreement	$ 5,000,000.0
Term Loan \| 2013 Loan and Security Agreement \| Prime Rate
Debt Instrument [Line Items]
Debt instrument, basis spread	1.50%

Debt - 2014 Loan and Security Agreement (Details)	1 Months Ended
Debt - 2014 Loan and Security Agreement (Details)	Feb. 28, 2014 USD ($) lender $ / shares shares	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Total debt, net carrying value		$ 33,648,000	$ 37,039,000
Debt, gross		34,477,000
Term Loan \| 2014 Loan and Security Agreement
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 30,000,000.0
Number of lenders \| lender	2
Credit facility, remaining borrowing capacity	$ 10,000,000.0
Credit facility, minimum incremental borrowing amount	$ 1,000,000.0
Total debt, net carrying value		$ 18,300,000	$ 20,000,000
Term Loan \| 2014 Loan and Security Agreement \| Prime Rate
Debt Instrument [Line Items]
Term loan, minimum interest rate	10.00%
Term Loan \| 2014 Loan and Security Agreement \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread	9.00%
Term Loan \| Tranche One
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 20,000,000.0
Payments of debt issuance costs	400,000
Debt, gross	$ 20,000,000.0
Common Stock \| Term Loan \| 2014 Loan and Security Agreement
Debt Instrument [Line Items]
Warrants issued \| shares	177,865
Warrants outstanding, exercise price (in USD per share) \| $ / shares	$ 10.12
Common Stock \| Term Loan \| Tranche One
Debt Instrument [Line Items]
Warrants vested, shares \| shares	118,577
Warrants vested, fair value	$ 1,000,000
Common Stock Warrant \| Term Loan \| 2014 Loan and Security Agreement
Debt Instrument [Line Items]
Class of warrant or right, vesting period (in years)	10 years
Warrants unvested, shares \| shares	59,288

Debt - Promissory Note/FCC Civil Penalty (Details) $ in Thousands	1 Months Ended
	Jun. 30, 2015 USD ($) installment	Jul. 31, 2013 USD ($) installment	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 12, 2015 USD ($)	Sep. 30, 2014 USD ($)
Debt Instrument [Line Items]
Debt, gross			$ 34,477
Discount on debt			829	$ 1,087
Total debt, net carrying value			33,648	37,039
FCC Civil Penalty
Debt Instrument [Line Items]
Debt, gross					$ 2,000
Notes Payable
Debt Instrument [Line Items]
Debt, gross			21,977	25,626
Total debt, net carrying value			21,148	24,539
Notes Payable \| Promissory Note
Debt Instrument [Line Items]
Debt, gross		$ 4,100	800	1,500
Debt instrument, stated interest rate		12.75%
Debt instrument, number of monthly payments \| installment		42
Notes Payable \| FCC Civil Penalty
Debt Instrument [Line Items]
Debt, gross	$ 2,000		1,333	1,667
Debt instrument, stated interest rate	12.75%
Debt instrument, number of quarterly payments \| installment	12
Discount on debt	$ 300
Total debt, net carrying value	$ 1,700		$ 1,200	$ 1,400
FCC Civil Penalty
Debt Instrument [Line Items]
Accrued liability						$ 2,000

Debt - Schedule of Outstanding Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Jun. 12, 2015
Debt Instrument [Line Items]
Debt, gross	$ 34,477
Less: discount	(829)	$ (1,087)
Total debt, net carrying value	33,648	37,039
Less: current portion of debt	(19,076)	(19,712)
Total debt, less current portion	14,572	17,327
FCC Civil Penalty
Debt Instrument [Line Items]
Debt, gross				$ 2,000
Notes Payable
Debt Instrument [Line Items]
Debt, gross	21,977	25,626
Total debt, net carrying value	21,148	24,539
Notes Payable \| 2014 Loan and Security Agreement
Debt Instrument [Line Items]
Debt, gross	18,333	20,000
Notes Payable \| 2013 Loan and Security Agreement
Debt Instrument [Line Items]
Debt, gross	1,500	2,500
Notes Payable \| Promissory note to USAC
Debt Instrument [Line Items]
Debt, gross	811	1,459
Notes Payable \| FCC Civil Penalty
Debt Instrument [Line Items]
Debt, gross	1,333	1,667	$ 2,000
Less: discount			(300)
Total debt, net carrying value	1,200	1,400	$ 1,700
Line of Credit
Debt Instrument [Line Items]
Debt, gross	$ 12,500	$ 12,500

Debt - Schedule of Maturities of Debt (Details) $ in Thousands	Jun. 30, 2016 USD ($)
Debt Disclosure [Abstract]
Remainder of 2016	$ 16,524
2017	5,286
2018	4,334
2019	8,333
Total	$ 34,477

Stockholders' Equity - Capital Structure (Details) - $ / shares	Jun. 30, 2016	Dec. 31, 2015
Equity [Abstract]
Common Stock, shares authorized (in shares)	450,000,000	450,000,000
Common Stock, par value (in USD per share)	$ 0.001	$ 0.001
Common Stock, shares issued (in shares)	52,554,124	51,164,621
Common Stock, shares outstanding (in shares)	52,554,124	51,164,621
Preferred Stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred Stock, par value (in USD per share)	$ 0.001	$ 0.001
Preferred Stock, shares issued (in shares)	0	0
Preferred Stock, shares outstanding (in shares)	0	0

Stockholders' Equity - Warrants (Details) - $ / shares	6 Months Ended
Stockholders' Equity - Warrants (Details) - $ / shares	Jun. 30, 2016	Dec. 31, 2015
Common Stock
Class of Warrant or Right
Warrants outstanding (in shares)	131,597	190,885
Outstanding warrants exercise price, weighted-average (in USD per share)	$ 9.89	$ 9.96
Minimum
Class of Warrant or Right
Warrant expiration date	2023-10
Maximum
Class of Warrant or Right
Warrant expiration date	2024-02

Stockholders' Equity - Common Stock Reserved for Future Issuance (Details) - shares	Jun. 30, 2016	Dec. 31, 2015	Apr. 03, 2014
Class of Stock
Common stock reserved for future issuance (in shares)	15,712,000
Stock options
Class of Stock
Stock options outstanding (in shares)	5,831,000	6,092,000
Restricted stock units
Class of Stock
Restricted stock units outstanding (in shares)	2,228,000	1,818,000
Common stock warrants outstanding
Class of Stock
Common stock reserved for future issuance (in shares)	132,000
ESPP
Class of Stock
Common stock reserved for future issuance (in shares)	1,258,442		880,000
2014 Plan
Class of Stock
Shares available for future grant (in shares)	6,263,000

Stockholders' Equity - Equity Incentive Plans (Details) - 2014 Plan - shares	Jun. 30, 2016	Jan. 01, 2016	Jan. 01, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award
Automatic annual increase in common stock reserved for issuance, percentage				5.00%
Automatic annual increase in common stock reserved for issuance, shares		2,558,231	2,466,124
Number of shares available for future grant	6,263,000
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares originally authorized for issuance				5,300,000
Number of shares available for future grant	6,263,141

Stockholders' Equity - Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares
Class of Stock
Closing market price of common stock (in USD per share)	$ 11.90
Stock options
Options Outstanding [Roll Forward]
Outstanding, beginning balance (in shares) \| shares	6,092
Options granted (weighted average grant date fair value of $3.81 per share) (in shares) \| shares	724
Options exercised (in shares) \| shares	(713)
Options forfeited or expired (in shares) \| shares	(272)
Outstanding, ending balance (in shares) \| shares	5,831
Options Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning balance, weighted average exercise price (in USD per share)	$ 4.58
Options granted, weighted average exercise price (in USD per share)	8.54
Options exercised, weighted average exercise price (in USD per share)	4.70
Options forfeited or expired, weighted average exercise price (in USD per share)	6.80
Outstanding, ending balance, weighted average exercise price (in USD per share)	4.95
Weighted average grant date fair value, options granted (in USD per share)	$ 4.00
Outstanding, ending balance, weighted average remaining contractual life	6 years 4 months 24 days
Outstanding, ending balance, aggregate intrinsic value \| $	$ 40,709

Stockholders' Equity - RSU Activity (Details) - Restricted stock units shares in Thousands	6 Months Ended
	Jun. 30, 2016 $ / shares shares
Number of Shares
Outstanding, beginning balance (in shares) \| shares	1,818
RSUs granted (in shares) \| shares	1,005
RSUs vested and released (in shares) \| shares	(512)
RSUs forfeited (in shares) \| shares	(83)
Outstanding, ending balance (in shares) \| shares	2,228
Weighted Average Grant Date Fair Value Per Share
Outstanding, beginning balance, weighted-average grant date fair value per share (in USD per share) \| $ / shares	$ 5.01
RSUs granted, weighted average grant date fair value (in USD per share) \| $ / shares	8.45
RSUs vested and released, weighted average grant date fair value (in USD per share) \| $ / shares	5.31
RSUs forfeited, weighted average grant date fair value (in USD per share) \| $ / shares	5.64
Outstanding, ending balance, weighted-average grant date fair value per share (in USD per share) \| $ / shares	$ 6.47

Stockholders' Equity - ESPP (Details) - $ / shares	May 13, 2016	Jun. 30, 2016	Jan. 01, 2016	Apr. 03, 2014
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuance (in shares)		15,712,000
ESPP
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuance (in shares)		1,258,442		880,000
Automatic annual increase in common stock reserved for issuance, percentage		1.00%
Maximum annual increase of shares reserved		1,000,000
Automatic annual increase in common stock reserved for issuance, shares			511,646
Purchases made under the ESPP	164,310
Weighted average purchase price (in USD per share)	$ 4.82

Stockholders' Equity - Stock-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Stock-based Compensation Expense
Stock-based compensation expense	$ 2,414	$ 1,830	$ 4,408	$ 4,065
Cost of revenue
Stock-based Compensation Expense
Stock-based compensation expense	329	218	594	406
Research and development
Stock-based Compensation Expense
Stock-based compensation expense	528	340	963	914
Sales and marketing
Stock-based Compensation Expense
Stock-based compensation expense	544	458	978	982
General and administrative
Stock-based Compensation Expense
Stock-based compensation expense	1,013	$ 814	1,873	$ 1,763
Stock options
Stock-based Compensation Expense
Unrecognized stock-based compensation expense	6,951		$ 6,951
Weighted-average amortization period			2 years 5 months 5 days
Restricted stock units
Stock-based Compensation Expense
Unrecognized stock-based compensation expense	12,218		$ 12,218
Weighted-average amortization period			3 years 4 days
ESPP
Stock-based Compensation Expense
Unrecognized stock-based compensation expense	$ 328		$ 328
Weighted-average amortization period			4 months 16 days

Stockholders' Equity - Valuation Assumptions (Details) - Stock options	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Class of Stock
Expected term (years)	6 years 1 month 6 days	6 years 29 days	6 years	6 years 29 days
Volatility	48.00%	49.00%	48.00%	49.00%
Risk-free interest rate	1.20%	1.50%	1.50%	1.50%
Dividend yield	0.00%	0.00%	0.00%	0.00%

Net Loss Per Share - Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net loss	$ (3,468)	$ (7,369)	$ (8,379)	$ (16,272)
Weighted-average shares used in computing basic and diluted net loss per share (in shares)	52,143	49,980	51,760	49,708
Basic and diluted net loss per share (in USD per share)	$ (0.07)	$ (0.15)	$ (0.16)	$ (0.33)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Net Loss Per Share - Antidilutive Securities Excluded from Computation of Diluted Net Loss Per Share (Details) - shares shares in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share
Anti-dilutive securities excluded from calculation of diluted net loss per share	8,338	8,839
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Anti-dilutive securities excluded from calculation of diluted net loss per share	5,831	6,775
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share
Anti-dilutive securities excluded from calculation of diluted net loss per share	2,228	1,526
ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share
Anti-dilutive securities excluded from calculation of diluted net loss per share	147	178
Common stock warrants \| Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Anti-dilutive securities excluded from calculation of diluted net loss per share	132	360

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes	$ 42	$ (20)	$ 70	$ (2)

Commitments and Contingencies - Commitments (Details) - Capital lease obligations $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Other Commitments [Line Items]
Capital lease future payment obligations incurred	$ 3.8
Capital lease future minimum payments, remainder of 2016	$ 0.8
Period remainder of minimum payments is due	31 months

Commitments and Contingencies - Universal Services Fund Liability (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
	Jul. 31, 2013	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Jun. 12, 2015	Sep. 30, 2014	Dec. 31, 2012
Loss Contingencies [Line Items]
Accrued federal fees		$ 6,008	$ 6,008	$ 5,684
Debt, gross		34,477	34,477
FCC Enforcement Bureau Civil Penalty
Loss Contingencies [Line Items]
Accrued liability							$ 2,000
General and administrative expense
Loss Contingencies [Line Items]
Interest and penalty expense		100	300
2003 through 2012 \| USF obligations
Loss Contingencies [Line Items]
Accrued federal fees								$ 8,100
2003 through 2012 \| Undisputed portion \| USF obligations
Loss Contingencies [Line Items]
Accrued federal fees								4,700
Payments	$ 600
2003 through 2012 \| Disputed portion \| USF obligations
Loss Contingencies [Line Items]
Accrued federal fees		5,100	5,100	4,900				3,400
2003 through 2007 \| Disputed portion \| USF obligations
Loss Contingencies [Line Items]
Accrued federal fees								$ 800
FCC Enforcement Bureau Civil Penalty
Loss Contingencies [Line Items]
Debt, gross						$ 2,000
Promissory Note \| USF obligations
Loss Contingencies [Line Items]
Debt, gross	4,100
Notes Payable
Loss Contingencies [Line Items]
Debt, gross		21,977	21,977	25,626
Notes Payable \| FCC Enforcement Bureau Civil Penalty
Loss Contingencies [Line Items]
Debt, gross		1,333	1,333	1,667	$ 2,000
Notes Payable \| Promissory Note
Loss Contingencies [Line Items]
Debt, gross	$ 4,100	800	800	1,500
Notes Payable \| Promissory Note \| USF obligations
Loss Contingencies [Line Items]
Debt, gross		$ 800	$ 800	$ 1,500

Commitments and Contingencies - State and Local Taxes and Surcharges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Loss Contingencies [Line Items]
General and administrative	$ 5,882	$ 6,027	$ 12,418	$ 13,302
Sales tax liability	1,650		1,650		$ 1,915
Accrued sales tax liability, current	1,215		1,215		1,262
Contingent sales tax liabilities
Loss Contingencies [Line Items]
Payments	25	900	300	900
Accrued sales tax liability, current	300		300		800
Potential Obligation for State Taxes on Usage Based Fees
Loss Contingencies [Line Items]
Sales tax liability	2,200		2,200		$ 2,700
Out of Period Adjustment \| Contingent sales tax liabilities
Loss Contingencies [Line Items]
General and administrative		600
General and administrative expense \| Contingent sales tax liabilities
Loss Contingencies [Line Items]
Estimated sales tax liability expense (gain)	$ (200)	$ 300	$ (200)	$ 1,000

Geographical Information - Schedule of Revenue and Property and Equipment by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets
Revenue	$ 38,886	$ 30,274	$ 76,901	$ 60,548
Property and equipment, net	13,188		13,188		$ 13,225
United States
Revenues from External Customers and Long-Lived Assets
Revenue	36,104	28,088	71,697	56,367
Property and equipment, net	11,178		11,178		10,939
International
Revenues from External Customers and Long-Lived Assets
Revenue	2,782	$ 2,186	5,204	$ 4,181
Property and equipment, net	$ 2,010		$ 2,010		$ 2,286

Subsequent Events (Details) - Subsequent Event	Aug. 01, 2016 USD ($) lender
Loan and Security Agreements 2014 and 2013
Subsequent Event [Line Items]
Repayments of debt	$ 32,400,000
Repayments of debt, administrative fees	$ 200,000
Line of Credit \| Loan and Security Agreement 2016 \| Revolving Credit Facility
Subsequent Event [Line Items]
Number of lenders \| lender	2
Credit facility, maximum borrowing capacity	$ 50,000,000.0
Credit facility, amount outstanding	$ 32,600,000
Line of Credit \| Prime Rate \| Minimum \| Loan and Security Agreement 2016 \| Revolving Credit Facility
Subsequent Event [Line Items]
Debt instrument, basis spread	0.50%
Line of Credit \| Prime Rate \| Maximum \| Loan and Security Agreement 2016 \| Revolving Credit Facility
Subsequent Event [Line Items]
Debt instrument, basis spread	0.75%