Broadsoft (BSFT) 10-K 23 Feb 17 2016 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Feb. 20, 2017	Jun. 30, 2016
Document Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY
Trading Symbol	BSFT
Entity Registrant Name	BROADSOFT, INC.
Entity Central Index Key	1,086,909
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		30,472,084
Entity Public Float			$ 1,194,829,173

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 82,993	$ 175,857
Short-term investments	136,428	72,531
Accounts receivable, net of allowance for doubtful accounts of $108 and $85 at December 31, 2016 and December 31, 2015, respectively	121,817	108,113
Other current assets	17,431	13,155
Total current assets	358,669	369,656
Long-term assets:
Property and equipment, net	22,626	19,481
Long-term investments	144,159	102,385
Intangible assets, net	27,839	18,835
Goodwill	82,758	72,275
Deferred tax assets	7,042	1,661
Other long-term assets	8,107	8,081
Total long-term assets	292,531	222,718
Total assets	651,200	592,374
Current liabilities:
Accounts payable and accrued expenses	33,854	28,667
Deferred revenue, current portion	97,037	106,483
Total current liabilities	130,891	135,150
Convertible senior notes	201,015	188,331
Deferred revenue	12,152	4,571
Other long-term liabilities	5,908	7,289
Total liabilities	349,966	335,341
Commitments and contingencies (Note 12)
Stockholders’ equity:
Preferred stock, $0.01 par value per share; 5,000,000 shares authorized at December 31, 2016 and December 31, 2015; no shares issued and outstanding at December 31, 2016 and December 31, 2015	0	0
Common stock, par value $0.01 per share; 100,000,000 shares authorized at December 31, 2016 and December 31, 2015; 30,353,127 and 29,080,197 shares issued and outstanding at December 31, 2016 and December 31, 2015, respectively	304	291
Additional paid-in capital	383,268	333,153
Accumulated other comprehensive loss	(21,845)	(13,810)
Accumulated deficit	(60,493)	(62,601)
Total stockholders’ equity	301,234	257,033
Total liabilities and stockholders’ equity	$ 651,200	$ 592,374

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 108	$ 85
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
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 dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	30,353,127	29,080,197
Common stock, shares outstanding (in shares)	30,353,127	29,080,197

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue:
License software	$ 129,313	$ 119,808	$ 103,311
Subscription and maintenance support	146,615	112,836	92,492
Professional services and other	65,034	46,199	21,054
Total revenue	340,962	278,843	216,857
Cost of revenue:
License software	7,585	10,231	9,755
Subscription and maintenance support	46,717	38,602	32,984
Professional services and other	36,875	28,925	14,955
Total cost of revenue	91,177	77,758	57,694
Gross profit	249,785	201,085	159,163
Operating expenses:
Sales and marketing	107,142	83,806	69,471
Research and development	77,202	60,749	50,125
General and administrative	49,934	41,287	32,993
Total operating expenses	234,278	185,842	152,589
Income from operations	15,507	15,243	6,574
Other expense:
Interest expense	15,756	10,656	7,706
Interest income	(2,680)	(1,270)	(529)
Other, net	155	5,714	1,300
Total other expense, net	13,231	15,100	8,477
Income (loss) before income taxes	2,276	143	(1,903)
Provision for (benefit from) income taxes	1,460	(36)	(2,199)
Net income	$ 816	$ 179	$ 296
Net income per common share:
Basic (in dollars per share)	$ 0.03	$ 0.01	$ 0.01
Diluted (in dollars per share)	$ 0.03	$ 0.01	$ 0.01
Weighted average common shares outstanding:
Basic (in shares)	29,670	29,113	28,654
Diluted (in shares)	30,898	29,818	29,365
Stock-based compensation expense included above:
Stock-based compensation expense	$ 51,507	$ 40,444	$ 30,273
Cost of revenue
Stock-based compensation expense included above:
Stock-based compensation expense	8,340	7,227	3,862
Sales and marketing
Stock-based compensation expense included above:
Stock-based compensation expense	18,056	13,821	9,856
Research and development
Stock-based compensation expense included above:
Stock-based compensation expense	15,062	11,844	10,164
General and administrative
Stock-based compensation expense included above:
Stock-based compensation expense	$ 10,049	$ 7,552	$ 6,391

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 816	$ 179	$ 296
Other comprehensive loss, net of tax:
Foreign currency translation adjustment	(8,667)	(5,418)	(6,061)
Unrealized gain (loss) on investments	632	(680)	(126)
Total other comprehensive loss, net of tax	(8,035)	(6,098)	(6,187)
Comprehensive loss	$ (7,219)	$ (5,919)	$ (5,891)

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock Par Value $0.01 Per Share	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Balance at beginning of period at Dec. 31, 2013	$ 192,859	$ 283	$ 232,183	$ (1,525)	$ (38,082)
Balance at beginning of period (in shares) at Dec. 31, 2013		28,305
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for exercise of stock options and vesting of RSUs, net of effect of early exercise of stock options and withholding tax	(7,085)	$ 7	(7,092)
Issuance of common stock for exercise of stock options and vesting of RSUs, net of effect of early exercise of stock options and withholding tax (in shares)		638
Stock-based compensation expense	30,225		30,225
Tax windfall benefits on exercises of stock options	2,853		2,853
Foreign currency translation adjustment	(6,061)			(6,061)
Unrealized loss on investments	(126)			(126)
Net income	296				296
Balance at end of period at Dec. 31, 2014	212,961	$ 290	258,169	(7,712)	(37,786)
Balance at end of period (in shares) at Dec. 31, 2014		28,943
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for exercise of stock options and vesting of RSUs, net of effect of early exercise of stock options and withholding tax	(4,110)	$ 9	(4,119)
Issuance of common stock for exercise of stock options and vesting of RSUs, net of effect of early exercise of stock options and withholding tax (in shares)		928
Repurchase of common stock	(25,002)	$ (8)			(24,994)
Repurchase of common stocks (in shares)		(791)
Equity component of 2022 convertible senior notes issuance, net of issuance costs	67,792		67,792
Equity component of 2018 convertible senior notes repurchase	(6,751)		(6,751)
Deferred tax liability related to convertible senior notes, net	(23,503)		(23,503)
Stock-based compensation expense	40,938		40,938
Tax windfall benefits on exercises of stock options	627		627
Foreign currency translation adjustment	(5,418)			(5,418)
Unrealized loss on investments	(680)			(680)
Net income	179				179
Balance at end of period at Dec. 31, 2015	$ 257,033	$ 291	333,153	(13,810)	(62,601)
Balance at end of period (in shares) at Dec. 31, 2015		29,080
Common stock, par value (in dollars per share)	$ 0.01
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for exercise of stock options and vesting of RSUs, net of effect of early exercise of stock options and withholding tax	$ (2,763)	$ 13	(2,776)
Issuance of common stock for exercise of stock options and vesting of RSUs, net of effect of early exercise of stock options and withholding tax (in shares)		1,273
Equity component of 2022 convertible senior notes issuance, net of issuance costs					1,292
Stock-based compensation expense	52,469		52,469
Tax windfall benefits on exercises of stock options	1,714		422
Foreign currency translation adjustment	(8,667)			(8,667)
Unrealized loss on investments	632			632
Net income	816				816
Balance at end of period at Dec. 31, 2016	$ 301,234	$ 304	$ 383,268	$ (21,845)	$ (60,493)
Balance at end of period (in shares) at Dec. 31, 2016		30,353
Common stock, par value (in dollars per share)	$ 0.01

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income	$ 816	$ 179	$ 296
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,993	15,836	12,391
Amortization of software licenses	3,401	2,848	3,342
Stock-based compensation expense	51,507	40,444	30,273
Provision for doubtful accounts	313	4	274
Benefit from deferred income taxes	(2,031)	(2,741)	(3,477)
Excess tax benefits related to stock-based compensation	(296)	(1,809)	(2,950)
Payment of original notes issuance discount	0	(1,094)	0
Non-cash interest expense on convertible senior notes	12,684	8,617	5,906
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(12,499)	(23,935)	(14,806)
Other current and long-term assets	(7,606)	(4,896)	(4,056)
Accounts payable, accrued expenses and other long-term liabilities	4,815	2,234	4,655
Current and long-term deferred revenue	(2,000)	9,099	22,911
Net cash provided by operating activities	67,097	44,786	54,759
Cash flows from investing activities:
Purchases of property and equipment	(15,738)	(12,876)	(10,523)
Payments for acquisitions, net of cash acquired	(34,678)	(21,172)	(3,650)
Purchases of marketable securities	(281,111)	(252,467)	(122,991)
Proceeds from sale of marketable securities	106,355	128,827	10,000
Proceeds from maturities of marketable securities	69,085	69,677	109,042
Change in restricted cash		0	564
Net cash used in investing activities	(156,087)	(88,011)	(17,558)
Cash flows from financing activities:
Proceeds from the exercise of stock options	15,181	6,187	710
Taxes paid on vesting of RSUs	(17,944)	(10,297)	(7,795)
Excess tax benefits related to stock-based compensation	296	1,809	2,950
Repurchase of common stock	0	(25,002)	0
Proceeds from issuance of 2022 convertible senior notes, net of issuance costs	0	194,822	0
Repurchase of 2018 convertible senior notes	0	(48,601)	0
Net cash provided by (used in) financing activities	(2,467)	118,918	(4,135)
Effect of exchange rate changes on cash and cash equivalents	(1,407)	(1,379)	(1,389)
Net increase (decrease) in cash and cash equivalents	(92,864)	74,314	31,677
Cash and cash equivalents, beginning of year	175,857	101,543	69,866
Cash and cash equivalents, end of year	82,993	175,857	101,543
Supplemental disclosures:
Cash paid for interest	3,000	1,418	1,801
Cash paid for income taxes	3,572	2,377	1,678
Change in accounts payable and accrued expenses for purchase of property and equipment	$ 1,523	$ 2,153	$ 688

Nature of Business

Nature of Business	12 Months Ended
	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business	Nature of Business BroadSoft, Inc. (“BroadSoft” or the “Company”), a Delaware corporation, was formed in 1998. The Company is the leading global provider of software and services that enable telecommunications service providers to deliver hosted, cloud-based Unified Communications, or UC, to their enterprise customers.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Principles of Consolidation The accompanying consolidated financial statements include the accounts and results of operations of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in the accompanying consolidated financial statements. Use of Estimates The preparation of financial statements in conformity with United States generally accepted accounting principles (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual amounts could differ from these estimates. Cash Equivalents The Company considers all highly liquid instruments purchased with an original maturity of three months or less to be cash equivalents. Cash equivalents are held in money market accounts. Investments in Marketable Securities Marketable debt securities that the Company does not intend to hold to maturity are classified as available-for-sale, are carried at fair value and are included on the Company’s consolidated balance sheet as either short-term or long-term investments depending on their maturity. Investments with original maturities greater than three months that mature less than one year from the consolidated balance sheet date are classified as short-term investments. Investments with maturities greater than one year from the consolidated balance sheet date are classified as long-term investments. Available-for-sale investments are marked-to-market at the end of each reporting period, with unrealized holding gains or losses, which represent temporary changes in the fair value of the investment, reflected in accumulated other comprehensive income (loss), a separate component of stockholders’ equity. The transfers from accumulated other comprehensive income into net income is immaterial. The Company’s primary objective when investing excess cash is preservation of principal. The following table summarizes the Company's investments: December 31, 2016 December 31, 2015 Contracted Maturity Carrying Value Contracted Maturity Carrying Value (in thousands) (in thousands) Money market funds demand $ 44,962 demand $ 123,170 Total cash equivalents $ 44,962 $ 123,170 U.S. agency notes 120 - 156 days 60,103 50 - 365 days 39,467 Commercial paper 137 days 1,993 — Corporate bonds 10 - 363 days 66,820 12 - 319 days 33,064 Asset-backed securities 107 - 258 days 7,512 — Total short-term investments $ 136,428 $ 72,531 U.S. agency notes 380 - 516 days 93,922 486 - 851 days 44,175 Corporate bonds 381 - 488 days 42,202 376 - 846 days 58,210 Asset-backed securities 410 - 464 days 8,035 — Total long-term investments $ 144,159 $ 102,385 The following table summarizes the cost and fair value of the Company's investments at December 31, 2016 (in thousands): Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. agency notes $ 154,272 $ 12 $ (261 ) $ 154,023 Commercial paper 1,993 — — 1,993 Corporate bonds 109,133 10 (120 ) 109,023 Asset-backed securities 15,545 4 (1 ) 15,548 Total investments $ 280,943 $ 26 $ (382 ) $ 280,587 The following table summarizes the cost and fair value of the Company's investments at December 31, 2015 (in thousands): Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. agency notes $ 83,977 $ — $ (334 ) $ 83,643 Corporate bonds 91,537 2 (266 ) 91,273 Total investments $ 175,514 $ 2 $ (600 ) $ 174,916 Fair Value Measurements The following table summarizes the carrying and fair value of the Company’s financial assets (in thousands): December 31, 2016 December 31, 2015 Carrying Value Fair Value Carrying Value Fair Value Assets Cash equivalents* $ 44,962 $ 44,962 $ 123,170 $ 123,170 Short and long-term investments 280,587 280,587 174,916 174,916 Total assets $ 325,549 $ 325,549 $ 298,086 $ 298,086 * Excludes $38.0 million and $52.7 million of operating cash balances as of December 31, 2016 and 2015 , respectively. The carrying amounts of the Company’s other financial instruments, accounts receivable, accounts payable and accrued expenses, approximate their respective fair values due to their short term nature. (See Note 9 Borrowings for additional information on fair value of debt.) The Company uses a three-tier fair value measurement hierarchy to classify and disclose all assets and liabilities measured at fair value on a recurring basis, as well as assets and liabilities measured at fair value on a non-recurring basis, in periods subsequent to their initial measurement. The three tiers are defined as follows: • Level 1 . Observable inputs based on unadjusted quoted prices in active markets for identical instruments and include the Company’s investments in money market funds and certificates of deposit; • Level 2 . Inputs valued using quoted market prices for similar instruments, nonbinding market prices that are corroborated by observable market data and include the Company’s investments and marketable securities in U.S. agency notes, commercial paper and corporate bonds; and • Level 3 . Unobservable inputs for which there is little or no market data, which require the Company to develop its own assumptions. Assets Measured at Fair Value on a Recurring Basis The Company evaluates its financial assets subject to fair value measurements on a recurring basis to determine the appropriate level of classification for each reporting period. This determination requires significant judgments to be made. There were no transfers between classification levels during the periods. The following table summarizes the values (in thousands): December 31, Level 1 Level 2 Level 3 Money market funds $ 44,962 $ 44,962 $ — $ — Total cash equivalents* 44,962 44,962 — — U.S. agency notes 154,024 — 154,024 — Commercial paper 1,993 — 1,993 — Corporate bonds 109,022 — 109,022 — Asset-backed securities 15,548 — 15,548 — Total investments 280,587 — 280,587 — Total cash equivalents and investments $ 325,549 $ 44,962 $ 280,587 $ — December 31, Level 1 Level 2 Level 3 Money market funds $ 123,170 $ 123,170 $ — $ — Total cash equivalents* 123,170 123,170 — — U.S. agency notes 83,643 — 83,643 — Corporate bonds 91,273 — 91,273 — Total investments 174,916 — 174,916 — Total cash equivalents and investments $ 298,086 $ 123,170 $ 174,916 $ — * Excludes $38.0 million and $52.7 million of operating cash balances as of December 31, 2016 and 2015 , respectively. Assets Measured at Fair Value on a Nonrecurring Basis The Company measures certain assets, including property and equipment, goodwill and intangible assets, at fair value on a nonrecurring basis. These assets are recognized at fair value when they are deemed to be impaired. During the years ended December 31, 2016 and 2015 , there were no assets or liabilities measured at fair value on a nonrecurring basis subsequent to their initial recognition. Concentration of Credit Risk Financial instruments that subject the Company to significant concentrations of credit risk consist primarily of cash and cash equivalents, marketable securities and accounts receivable. All of the Company’s cash and cash equivalents and marketable securities are held at financial institutions that management believes to be of high credit quality. The Company’s cash and cash equivalent accounts may exceed federally insured limits at times. The Company has not experienced any losses on cash and cash equivalents to date. To manage accounts receivable risk, the Company evaluates the creditworthiness of its customers and maintains an allowance for doubtful accounts. The following customers represented 10% or more of revenue for the periods presented: Year Ended December 31, 2016 2015 2014 Revenue Company A * * 13 % Company B 10 % * * * Represented less than 10% Accounts Receivable and Allowance for Doubtful Accounts Accounts receivable are derived from sales to customers. Each customer is evaluated for creditworthiness through a credit review process at the time of each order. Accounts receivable are stated at realizable value, net of an allowance for doubtful accounts that is maintained for estimated losses that would result from the inability of some customers to make payments as they become due. The allowance is based on an analysis of past due amounts and ongoing credit evaluations. Collection experience has been consistent with the Company’s estimates. Property and Equipment Property and equipment are stated at cost, less accumulated depreciation and amortization. Replacements and major improvements are capitalized; maintenance and repairs are charged to expense as incurred. Depreciation is calculated using the straight-line method over the estimated useful lives of the related assets per the table below: Equipment 3 - 5 years Software 1.5 - 3 years Furniture and fixtures 5 years Leasehold improvements are amortized over the shorter of the term of the lease and the estimated useful life of the assets. Business Combinations In a business combination, the Company allocates the purchase price to the acquired business’ identifiable assets and liabilities at their acquisition date fair values. The excess of the purchase price over the amount allocated to the identifiable assets and liabilities, if any, is recorded as goodwill. The excess, if any, of the fair value of the identifiable assets acquired and liabilities assumed over the consideration transferred is recognized as a gain within other income in the consolidated statement of operations as of the acquisition date. To date, the assets acquired and liabilities assumed in the Company’s business combinations have primarily consisted of acquired working capital, definite-lived intangible assets and goodwill. The carrying value of acquired working capital approximates its fair value, given the short-term nature of these assets and liabilities. The Company estimates the fair value of definite-lived intangible assets acquired using a discounted cash flow approach, which includes an analysis of the future cash flows expected to be generated by such assets and the risk associated with achieving such cash flows. The key assumptions used in the discounted cash flow model include the discount rate that is applied to the discretely forecasted future cash flows to calculate the present value of those cash flows and the estimate of future cash flows attributable to the acquired intangible, which include revenue, operating expenses and taxes. The Company's estimates are inherently uncertain and subject to refinement. As a result, during the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the fair value of assets acquired and liabilities assumed, with the corresponding offset to goodwill. Goodwill Goodwill represents the excess of (a) the aggregate of the fair value of consideration transferred in a business combination, over (b) the fair value of assets acquired, net of liabilities assumed. Goodwill is not amortized, but is subject to annual impairment tests as described below. The Company tests goodwill for impairment annually on December 31, or more frequently if events or changes in business circumstances indicate the asset might be impaired. The Company may first assess qualitative factors to determine if it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test included in U.S. GAAP. To the extent the assessment identifies adverse conditions, or if the Company elects to bypass the qualitative assessment, goodwill is tested for impairment at the reporting unit level using a two-step approach. The first step is to compare the fair value of the reporting unit to the carrying value of the net assets assigned to the reporting unit. If the fair value of the reporting unit is greater than the carrying value of the net assets assigned to the reporting unit, the assigned goodwill is not considered impaired. If the fair value is less than the reporting unit’s carrying value, step two is performed to measure the amount of the impairment, if any. In the second step, the fair value of goodwill is determined by deducting the fair value of the reporting unit’s identifiable assets and liabilities from the fair value of the reporting unit as a whole, as if the reporting unit had just been acquired and the purchase price were being initially allocated. If the carrying value of goodwill exceeds the implied fair value, an impairment charge would be recorded to operating expenses in the consolidated statement of operations in the period the determination is made. The Company has determined that it has one reporting unit, BroadSoft, Inc., which is the consolidated entity. Based on the Company’s completion of the first step of the two-step goodwill impairment test, there was no indication of impairment as of December 31, 2016 , 2015 or 2014 . (See Note 4 Goodwill and Intangibles. ) Identifiable Intangible Assets The Company acquired intangible assets in connection with certain of its business acquisitions. These assets were recorded at their estimated fair values at the acquisition date and are amortized over their respective estimated useful lives using a method of amortization that reflects the pattern in which the economic benefits of the intangible assets are used. Estimated useful lives are determined based on the Company’s historical use of similar assets and the expectation of future realization of revenue attributable to the intangible assets. In those cases where the Company determines that the useful life of an intangible asset should be shortened, the Company amortizes the net book value in excess of the estimated salvage value over its revised remaining useful life. The Company did not revise the useful life estimates attributed to any of the Company’s intangible assets during the years ended December 31, 2016 , 2015 or 2014 . (See Note 4 Goodwill and Intangibles .) The estimated useful lives used in computing amortization are as follows: Customer relationships 3 - 8 years Developed technology 2 - 6 years Trade names 1 - 7 years Impairment of Long-Lived Assets The Company reviews long-lived assets, including property and equipment and definite-lived intangible assets, for impairment whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of the assets to future undiscounted net cash flows expected to be generated by the assets. Recoverability measurement and estimating of undiscounted cash flows for assets to be held and used is done at the lowest possible levels for which there are identifiable cash flows. If such assets are considered impaired, the amount of impairment recognized would be equal to the amount by which the carrying amount of the assets exceeds the fair value of the assets, which the Company would compute using a discounted cash flow approach. Assets to be disposed of are recorded at the lower of the carrying amount or fair value less costs to sell. There was no impairment of long-lived assets during the years ended December 31, 2016 , 2015 or 2014 . Deferred Financing Costs The Company amortizes deferred financing costs using the effective-interest method and records such amortization as interest expense. Revenue Recognition The Company’s revenue is generated from the sales of software licenses and related maintenance for those licenses, subscription and usage fees related to the SaaS offerings and professional services. The Company’s software licenses, subscription and maintenance contracts and professional services are sold directly through its own sales force and indirectly through distribution partners. License Software Revenue from software licenses is recognized when the following four basic criteria are met as follows: • Persuasive evidence of an arrangement. For direct sales, an agreement signed by the Company and by the customer, in conjunction with a non-cancelable purchase order or executed sales quote from the customer, is deemed to represent persuasive evidence of an arrangement. For sales through distribution partners, a purchase order or executed sales quote, in conjunction with a reseller agreement with the distribution partner and evidence of the distribution partner's customer, is deemed to represent persuasive evidence of an arrangement. Revenue is deferred for sales through a distribution partner without proof of the distribution partner's customer. • Delivery has occurred. Delivery is deemed to have occurred when the customer is given electronic access to the licensed software and a license key for the software has been delivered or made available. If an arrangement contains a requirement to deliver additional elements essential to the functionality of the delivered element, revenue associated with the arrangement is recognized when delivery of the final element has occurred. • Fees are fixed or determinable. The Company considers the fee to be fixed or determinable unless the fee is subject to refund or adjustment or is not payable within normal payment terms. If the fee is subject to refund or adjustment, revenue is recognized when the refund or adjustment right lapses. If payment terms exceed the Company’s normal terms, revenue is recognized as the amounts become due and payable or upon the receipt of cash if collection is not probable. • Collection is probable. Each customer is evaluated for creditworthiness through a credit review process at the inception of an arrangement. Collection is deemed probable if, based upon the Company’s evaluation, the Company expects that the customer will be able to pay amounts under the arrangement as payments become due. If it is determined that collection is not probable, revenue is deferred and recognized upon cash collection. The warranty period for the Company’s licensed software is generally 90 days . The Company delivers its licensed software primarily by utilizing electronic media. Subscription and Maintenance Support The Company typically sells annual maintenance support contracts in combination with license software sales. Maintenance support enables the customer to continue receiving software maintenance and support after the warranty period has expired. Maintenance support is renewable at the option of the customer. When customers prepay for annual maintenance support, the related revenue is deferred and recognized ratably over the term of the maintenance period. Generally, rates for maintenance support, including subsequent renewal rates, are established based upon a specific percentage of net license fees as set forth in the arrangement. Maintenance support typically includes the right to unspecified product upgrades on an if-and-when available basis. The Company’s subscription revenue is generated from a recurring fee and/or a usage based fee from customers purchasing the Company's SaaS offerings. Under these arrangements, the Company is generally paid a recurring fee calculated based on the number of seats and type of service purchased or a usage fee based on the actual number of transactions. Revenue related to the recurring fee is recognized ratably over the contract term beginning with the date our service is made available to the customer. The usage fee is recognized as revenue in the period in which the transactions occur. Subscription agreements do not provide customers with the right to take possession of the underlying software at any time. Professional Services and Other Revenue from professional services includes implementation, training and consulting and design and customization services. Professional services are generally either daily-rate or fixed-fee arrangements. Revenue from daily-rate arrangements is typically recognized as services are performed. Revenue related to fixed-fee arrangements are typically recognized upon completion of all of the deliverables. Services are generally not considered essential to the functionality of the licensed software. Costs related to shipping and handling and billable travel expenses are included in cost of revenue. Multiple Element Arrangements The Company accounts for multiple element arrangements that consist of software and software-related services, collectively referred to as “software elements,” in accordance with industry specific accounting guidance for software and software-related transactions. For such transactions, the Company generally allocates revenue to the software license by determining the fair value of the undelivered elements, which is usually maintenance support and professional services. The Company establishes vendor-specific objective evidence ("VSOE") of the fair value of the maintenance support based on the renewal price as stated in the agreement and as charged in the first optional renewal period under the arrangement. VSOE for professional services is determined based on an analysis of our historical daily rates when these professional services are sold separately from the software license. For the Company's cloud offering with multiple element arrangements that include subscription and professional services, the Company allocates revenue to all deliverables based on their relative selling prices. In such circumstances, the Company uses the following hierarchy to determine the selling price to be used for allocating revenue to deliverables (a) vendor-specific objective evidence of fair value, (b) third-party evidence of selling price and (c) best estimate of the selling price. Best estimate of selling price reflects the Company’s estimates of what the selling prices of elements would be if they were sold on a stand-alone basis. Factors considered by the Company in developing relative selling prices for products and services include the discounting practices, price lists, go-to-market strategy, historical standalone sales and contract prices. Research and Development Research and development expenses consist primarily of personnel and related expenses for the Company's research and development staff, including salaries, benefits, bonuses and stock-based compensation and the cost of certain third-party contractors. Research and development costs, other than software development expenses qualifying for capitalization, are expensed as incurred. Software Development Costs Software development costs for software to be sold, leased or marketed that is incurred prior to the establishment of technological feasibility are expensed as incurred as research and development expense. Software development costs incurred subsequent to the establishment of technological feasibility, if any, are capitalized until the software is available for general release to customers. The Company has determined that technological feasibility has been established at approximately the same time as the general release of such software to customers. Therefore, to date, the Company has not capitalized any related software development costs. Internal-Use Software Development Costs The Company capitalizes costs associated with customized internal-use software systems that have reached the application development stage. Such capitalized costs include costs directly associated with the development of the applications. Capitalization of such costs begins when the preliminary project stage is complete and ceases at the point the project is substantially complete and is ready for its intended purpose. Internal-use software is amortized on a straight-line basis over the estimated useful life. Costs incurred during the preliminary development stage, as well as maintenance and training costs, are expensed as incurred. The Company capitalized $3.5 million and $2.2 million in internal-use software during the years ended December 31, 2016 and 2015 , respectively. Capitalized internal-use software is included in property and equipment. The Company recorded amortization expense related to these assets of $1.9 million , $1.5 million and $0.7 million during the years ended December 31, 2016 , 2015 and 2014 , respectively. Deferred Revenue Deferred revenue represents amounts billed to or collected from customers for which the related revenue has not been recognized because one or more of the revenue recognition criteria have not been met. The current portion of deferred revenue is expected to be recognized as revenue within 12 months from the balance sheet date. Deferred revenue consists of the following (in thousands): December 31, December 31, License software $ 17,662 $ 33,200 Subscription and maintenance support 72,559 61,399 Professional services and other 18,968 16,455 Total $ 109,189 $ 111,054 Current portion $ 97,037 $ 106,483 Non-current portion 12,152 4,571 Total $ 109,189 $ 111,054 Cost of Revenue Cost of revenue includes (a) royalties and other fees paid to third parties whose technology or products are sold as part of the Company’s products, (b) direct costs to manufacture and distribute product, (c) direct costs to provide product support and professional support services, (d) direct costs associated with delivery of the Company's SaaS offerings and (e) amortization expense related to acquired intangible assets. Income Taxes The Company uses the liability method of accounting for income taxes as set forth in the authoritative guidance for accounting for income taxes. This method requires an asset and liability approach for the recognition of deferred tax assets and liabilities for the expected future tax consequences attributable to temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and their respective tax bases, and for operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured by applying enacted statutory tax rates applicable to the future years in which deferred amounts are expected to be settled or realized. The Company currently has significant deferred tax assets, primarily resulting from net operating loss carryforwards, deferred revenue and stock-based compensation expense. The Company has a valuation allowance of $1.8 million against its net deferred tax assets. Management weighs the positive and negative evidence to determine if it is more likely than not that some or all of the deferred tax assets will be realized. The Company accounts for uncertainty in income taxes using a two-step approach to recognize and measure tax benefits when the realization of the benefits is uncertain. The first step is to determine whether the benefit is to be recognized; the second step is to determine the amount to be recognized. Income tax benefits should be recognized when, based on the technical merits of a tax position, the entity believes that if a dispute arose with the taxing authority and were taken to a court of last resort, it is more likely than not (i.e., a probability of greater than 50 percent) that the tax position would be sustained as filed. If a position is determined to be more likely than not of being sustained, the reporting enterprise should recognize the largest amount of tax benefit that is greater than 50 percent likely of being realized upon ultimate settlement with the taxing authority. The Company’s practice is to recognize interest and penalties related to income tax matters in income tax expense. Stock-Based Compensation The Company applies the fair value method for determining the cost of stock-based compensation for employees, directors and consultants. Under this method, the total cost of a stock option grant is measured based on the estimated fair value of the stock option award at the date of the grant, using the Black-Scholes valuation model. The fair value of a restricted stock unit ("RSU") is based on the market value of the Company’s common stock on the date of grant. The fair value of a performance stock unit ("PSU") is based on the market price of the Company’s stock on the date of grant and assumes that the performance criteria will be met and the target payout level will be achieved. Compensation cost is adjusted for subsequent changes in the outcome of performance-related conditions until the award vests. The fair value of PSUs with a market condition is estimated on the date of award, using a Monte Carlo simulation valuation model to estimate the total return ranking of the Company’s stock in relation to the target index of companies over each performance period. Compensation cost on PSUs with a market condition is not adjusted for subsequent changes regardless of the level of ultimate vesting. For service only awards, the total cost related to the portion of awards granted that is ultimately expected to vest is recognized as stock-based compensation expense on a straight-line basis over the requisite service period of the grant. For PSUs, the total cost related to the portion of the awards granted that is ultimately expected to vest is recognized as stock-based compensation expense on a graded basis over the requisite service period of the grant. Estimated Fair Value of Share-Based Payments For awards granted subsequent to January 1, 2016, the Company used the Black-Scholes valuation model. For awards granted prior to January 1, 2016, the Company used the binomial options pricing model, or binomial lattice valuation model. The fair value of the stock option awards calculated using Black-Scholes valuation model is consistent with the fair value of the stock option awards calculated using binomial lattice valuation model. Black-Scholes valuation model requires the input of highly subjective assumptions, including the the expected term of the option, the expected volatility of the price of the Company's common stock, risk-free interest rates, and the expected dividend yield of the Company's common stock. The assumptions used in the Company valuation model represent management’s best estimates. These estimates involve inherent uncertainties and the application of management’s judgment. If factors change and different assumptions are used, our stock-based compensation expense could be materially different in the future. Fair value of the stock options was estimated at the grant date, using the following weighted average assumptions: Year ended December 31, 2016 2015 2014 Average assumptions: Risk-free interest rate 1.3 % 1.5 % 1.7 % Expected dividend yield — % — % — % Expected volatility 47 % 52 % 53 % Expected term (years) 5.6 years 6.9 years 7.6 years The Company has assumed no dividend yield because dividends are not expected to be paid in the near future, which is consistent with the Company’s history of not paying dividends. The risk-free interest rate assumption is based upon observed interest rates for constant maturity U.S. Treasury securities appropriate for the term of the Company’s employee stock options. The expected term of an option represents the period that Company's stock-based awards are expected to be outstanding and is calculated using a combination of historical exercise experience adjusted to reflect the current vesting period of options being valued, and partial life cycles of outstanding options. Expected volatility is based on the historical volatility of the Company and comparable public companies. The Company’s estimate of pre-vesting forfeitures, or forfeiture rate, is based on an analysis of historical behavior by option holders. Net Income Per Common Share Basic net income per common share is computed based on the weighted average number of outstanding shares of common stock. Diluted income per common share adjusts the basic weighted average common shares outstanding for the potential dilution that could occur if stock options, RSUs, PSUs and convertible securities were exercised or converted into common stock. The following table presents a reconciliation of the numerator and denominator of the basic and diluted earnings per share computation. In the table below, net income represents the numerator and weighted average common shares outstanding represents the denominator: Year Ended December 31, 2016 2015 2014 (in thousands, except per share data) Net income $ 816 $ 179 $ 296 Weighted average basic common shares outstanding 29,670 29,113 28,654 Dilutive effect of stock-based awards 976 705 711 Dilutive effect of premium feature of the Notes 252 — — Weighted average diluted common shares outstanding 30,898 29,818 29,365 Earnings per share: Basic $ 0.03 $ 0.01 $ 0.01 Diluted $ 0.03 $

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2016
Business Combinations [Abstract]
Acquisitions	Acquisitions VoIP Logic LLC On October 28, 2016, the Company completed its acquisition of all of the outstanding units of VoIP Logic LLC ("VoIP Logic"), a wholesale provider of BroadWorks-based cloud communications services to service providers who want greater control of their platform and to maintain their own administrative systems. This cloud offering was added to the Company's BroadCloud portfolio. The total consideration paid for VoIP Logic was $13.4 million , which was funded with cash on hand. The Company incurred $0.5 million of transaction costs for financial advisory and legal services related to the acquisition, which are included in general and administrative expenses, in the Company’s consolidated statements of operations. The consolidated financial statements include the results of VoIP Logic from the date of acquisition. The purchase price has been allocated to the assets acquired and liabilities assumed based on fair values as of the acquisition date. The following table summarizes the fair value of the assets acquired and liabilities assumed at the acquisition date of October 28, 2016 (in thousands): Cash and cash equivalents $ 69 Accounts receivable 388 Prepaid and other assets 21 Property and equipment 182 Trade name 100 Customer relationships 7,900 Goodwill 5,065 Accounts payable and accrued expenses (375 ) Total consideration $ 13,350 Customer relationships represent the fair value of the underlying relationships and agreements with VoIP customers. The trade name and customer relationships are being amortized on a straight-line basis over a period of three and eight years respectively, which in general reflects the estimated cash flows to be generated from such assets. The excess of purchase consideration over the fair value of the net tangible and identifiable intangible assets acquired of $5.1 million was recorded as goodwill. The goodwill balance is attributable to the assembled workforce and the synergies expected as a result of the acquisition. In accordance with U.S. GAAP, goodwill associated with this acquisition will not be amortized but will be tested for impairment on an annual basis. Goodwill associated with this acquisition is deductible for tax purposes over 15 years. Transera Communications, Inc. On February 4, 2016, the Company completed its acquisition of all the stock of Transera Communications, Inc. ("Transera"), which was subsequently renamed BroadSoft Contact Center, Inc. Transera provides cloud-based contact center software and the acquisition enables the Company to offer its customers a comprehensive cloud contact center solution that is complementary to, and integrates with, its BroadWorks and SaaS platform. The total consideration paid for Transera was $19.8 million , which was funded with cash on hand. The Company incurred $0.5 million of transaction costs for financial advisory and legal services related to the acquisition, which are included in general and administrative expenses, in the Company’s consolidated statements of operations. The consolidated financial statements include the results of Transera from the date of acquisition. The purchase price has been allocated to the assets acquired and liabilities assumed based on fair values as of the acquisition date. The following table summarizes the fair value of the assets acquired and liabilities assumed at the acquisition date of February 4, 2016 (in thousands): Cash and cash equivalents $ 365 Accounts receivable 1,623 Prepaid and other assets 285 Property and equipment 155 Deferred tax assets 3,496 Trade name 160 Customer relationships 4,100 Developed technology 3,050 Goodwill 7,825 Deferred revenue (111 ) Accounts payable and accrued expenses (1,148 ) Total consideration $ 19,800 The trade name represents the fair value of the Transera trade name that the Company intends to use for a fixed period of time. Customer relationships represent the fair value of the underlying relationships and agreements with Transera customers. Developed technology represents the fair value of Transera's intellectual property. The trade name, customer relationships and developed technology are being amortized on a straight-line basis over a period of three years, seven years and five years, respectively, which in general reflects the estimated cash flows to be generated from such assets. The weighted-average amortization period for depreciable intangible assets acquired is approximately six years. The excess of purchase consideration over the fair value of the net tangible and identifiable intangible assets acquired of $7.8 million was recorded as goodwill. The goodwill balance is attributable to the assembled workforce and the synergies expected as a result of the acquisition. In accordance with U.S. GAAP, goodwill associated with this acquisition will not be amortized but will be tested for impairment on an annual basis. Goodwill associated with this acquisition is not deductible for tax purposes. mPortal Inc. On June 3, 2015, the Company completed its acquisition of all of the stock of mPortal Inc. ("mPortal"), a professional services company, which was subsequently within the Company renamed BroadSoft Design, Inc. The acquisition enabled the Company to offer its customers the ability to deliver customizable UC experiences to a wide range of business end users. The total consideration paid for mPortal was $ 14.8 million . The Company funded the acquisition with $14.3 million of cash on hand and $0.5 million of restricted stock units. The Company incurred $0.7 million of transaction costs for financial advisory and legal services related to the acquisition that are included in general and administrative expenses as incurred, in the Company’s consolidated statements of operations for the year ended December 31, 2015. The consolidated financial statements include the results of mPortal from the date of acquisition. The purchase price has been allocated to the assets acquired and liabilities assumed based on fair values as of the acquisition date. The following table summarizes the fair value of the assets acquired and liabilities assumed at the acquisition date of June 3, 2015 (in thousands): Cash and cash equivalents $ 2,748 Accounts receivable 1,920 Prepaid and other assets 293 Deferred tax assets 2,404 Property and equipment 15 Customer relationships 5,600 Goodwill 2,497 Accounts payable and accrued expenses (677 ) Total consideration $ 14,800 Customer relationships represent the fair value of the underlying relationships and agreements with mPortal customers. The customer relationships intangible asset is being amortized on a straight-line basis over a period of eight years, which in general reflects the cash flows generated. The excess of purchase consideration over the fair value of the net tangible and identifiable intangible assets acquired of $2.5 million was recorded as goodwill. The goodwill balance is attributable to the assembled workforce and the synergies expected as a result of the acquisition. In accordance with U.S. GAAP, goodwill associated with this acquisition will not be amortized but will be tested for impairment on an annual basis. Goodwill associated with this acquisition is not deductible for tax purposes. Pro Forma Financial Information for Acquisitions of mPortal, Transera Communications, Inc. and VoIP Logic (unaudited) The businesses acquired in 2016 contributed aggregate revenue of $8.8 million and net losses of $5.0 million for the period from the relevant acquisition date to December 31, 2016. The businesses acquired in 2015 contributed aggregate revenue of $7.6 million and net losses of $0.8 million for the period from the acquisition date to December 31, 2015. The acquisitions the Company completed in 2014 were not considered to be material, individually or in the aggregate. The unaudited pro forma statements of operations data below gives effect to the acquisitions as if they had occurred as of the beginning of the year prior to the acquisition. The following data includes adjustments for amortization of intangibles and acquisition costs. The pro forma information as presented below is for informational purposes only and is not necessarily indicative of the results of operations that would have been achieved if the acquisitions had been in effect for the periods presented. Year Ended December 31, 2016 2015 2014 (In thousands except per share data) Revenue $ 346,844 $ 298,974 $ 233,576 Net (loss) income 1,103 (1,785 ) (1,311 ) Net (loss) income per common share, basic $ 0.04 $ (0.06 ) $ (0.05 ) Net (loss) income per common share, diluted $ 0.04 $ (0.06 ) $ (0.05 )

Goodwill and Intangibles

Goodwill and Intangibles	12 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangibles	Goodwill and Intangibles The Company has concluded it has a single reporting unit. Accordingly, on an annual basis management performs the impairment assessment required under FASB guidelines at the consolidated enterprise level. The Company performed an impairment test of the Company’s goodwill and determined that no impairment of goodwill existed at December 31, 2016 or 2015 . The following table provides a summary of the changes in the carrying amounts of goodwill (in thousands): Balance, December 31, 2014 $ 65,303 Increase in goodwill related to acquisitions 9,123 Other (2,151 ) Balance, December 31, 2015 72,275 Increase in goodwill related to acquisitions 13,638 Other (3,155 ) Balance, December 31, 2016 $ 82,758 For the year ended December 31, 2016, the increase in ''goodwill related to acquisitions'' consists of $5.1 million of goodwill related to the acquisition of VoIP Logic in October 2016, $7.8 million of goodwill related to the acquisition of Transera in February 2016, $0.9 million of goodwill related to the acquisition of an enterprise messaging-based team communication and collaboration software application company in May 2016 and a $(0.2) million measurement period adjustment related to a cloud-based communications provider located in Japan acquired in November 2015. For the year ended December 31, 2015, the increase in "goodwill related to acquisitions" consists of $3.3 million of goodwill related to the immaterial acquisition of a hosted voice over IP (VoIP) OSS provider in January 2015, $2.5 million of goodwill related to the acquisition of mPortal in June 2015 and $3.3 million of goodwill related to the immaterial acquisition of a cloud-based communications provider located in Japan in November 2015. Any change in the goodwill amounts resulting from foreign currency translations are presented as “Other” in the above table. The Company’s acquired intangible assets are subject to amortization. The following is a summary of intangible assets (in thousands): December 31, 2016 December 31, 2015 Gross Carrying Amount Accumulated Amortization Net Amount Gross Carrying Amount Accumulated Amortization Net Amount Customer relationships $ 28,252 $ 6,259 $ 21,993 $ 17,571 $ 3,721 $ 13,850 Developed technology 12,952 7,446 5,506 13,277 8,489 4,788 Trade name 550 210 340 298 101 197 Total $ 41,754 $ 13,915 $ 27,839 $ 31,146 $ 12,311 $ 18,835 Amortization expense on intangible assets was $6.6 million , $5.8 million and $5.4 million in 2016 , 2015 and 2014 , respectively. In addition, in 2016 , 2015 and 2014 , the Company retired $4.5 million , $5.9 million and $1.3 million of fully amortized intangible assets, respectively, impacting both the gross carrying amount and accumulated amortization by this amount. As of December 31, 2016 , future amortization expense on intangible assets is expected to be as follows (in thousands): 2017 $ 6,429 2018 5,105 2019 4,729 2020 4,140 2021 2,883 2022 and thereafter 4,553 Total amortization expense $ 27,839

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment Property and equipment consists of the following (in thousands): December 31, 2016 2015 Equipment $ 31,999 $ 26,767 Software 16,887 11,460 Furniture and fixtures 2,133 1,645 Leasehold improvements 6,580 5,605 57,599 45,477 Less accumulated depreciation and amortization (34,973 ) (25,996 ) Property and equipment, net $ 22,626 $ 19,481 Depreciation and amortization expense related to property and equipment for the years ended December 31, 2016 , 2015 and 2014 was $11.4 million , $9.8 million and $7.0 million , respectively.

Accounts Payable and Other Curr

Accounts Payable and Other Current Liabilities	12 Months Ended
	Dec. 31, 2016
Accounts Payable and Accrued Liabilities, Current [Abstract]
Accounts Payable and Other Current Liabilities	Accounts Payable and Other Current Liabilities Accounts payable and other current liabilities consist of the following (in thousands): December 31, 2016 2015 Accounts payable and accrued expenses $ 14,676 $ 12,102 Accrued compensation 15,021 11,670 Other 4,157 4,895 $ 33,854 $ 28,667

Software Licenses

Software Licenses	12 Months Ended
	Dec. 31, 2016
Deferred Revenue Disclosure [Abstract]
Software Licenses	Software Licenses The Company has entered into an agreement with a third-party that provides the Company the right to distribute its software on an unlimited basis through December 2020. For the period from June 2012 to May 2016, the Company had a fixed cost associated with these distribution rights of $10.2 million , which was amortized to cost of revenue over the four -year period beginning June 2012, based on the straight line method. For the period from June 2016 to December 2020, the Company has a fixed cost associated with these distribution rights of $17.3 million , and if annual billed license software revenue over the extended term exceeds $850 million , the Company will be required to pay additional fees. The $17.3 million is being amortized to cost of revenue over the extended term beginning in June 2016, based on the straight line method. Amortization expense related to these agreements was $3.3 million , $2.6 million and $2.6 million for each of the years ended December 31, 2016 , 2015 and 2014 , respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The following table presents the components of the income before income taxes and the provision for (benefit from) income taxes (in thousands): Year ended December 31, 2016 2015 2014 Income (loss) before income taxes: United States $ 4,260 $ (1,488 ) $ (4,769 ) Foreign (1,984 ) 1,631 2,866 Income (loss) before income taxes $ 2,276 $ 143 $ (1,903 ) Provision for (benefit from) income taxes: Current: Federal and state $ 848 $ 965 $ 4,718 Foreign 2,571 3,244 1,726 Total current $ 3,419 $ 4,209 $ 6,444 Deferred: Federal and state $ (2,354 ) $ (4,018 ) $ (5,360 ) Foreign 395 (227 ) (3,283 ) Total deferred $ (1,959 ) $ (4,245 ) $ (8,643 ) Provision for (benefit from) income taxes $ 1,460 $ (36 ) $ (2,199 ) The following table presents the components of net deferred tax assets (liabilities) and the related valuation allowance (in thousands): December 31, 2016 2015 Deferred tax assets: Net operating loss carry-forward $ 2,795 $ 2,509 Deferred revenue 8,718 8,296 Depreciation and amortization 1,581 1,428 Research tax credit carry-forward 4,961 2,869 Accrued expenses 1,565 2,927 Stock-based compensation 10,094 8,181 Other 10,136 7,726 Total deferred tax assets $ 39,850 $ 33,936 Valuation allowance (1,813 ) (312 ) Net deferred tax assets $ 38,037 $ 33,624 Deferred tax liabilities: Acquired intangibles $ (7,734 ) $ (6,181 ) Convertible debt discount (23,978 ) (28,213 ) Other (177 ) (537 ) Total deferred tax liabilities $ (31,889 ) $ (34,931 ) Net deferred tax assets $ 6,148 $ (1,307 ) The Company has $34.4 million and $35.9 million of U.S. net operating loss carryforwards as of December 31, 2016 and 2015 , respectively. Additionally, the Company has $16.5 million and $11.1 million of tax credit carryforwards for tax return purposes as of December 31, 2016 and 2015 , respectively. The U.S. net operating loss and tax credit carryforwards are scheduled to begin to expire in 2019 and 2020, respectively. The Company has excluded certain U.S. net operating loss carryforwards from the calculation of deferred tax assets presented above, as they represent excess stock option deductions that do not reduce the Company’s income taxes payable. The excess tax benefits associated with stock option exercises and restricted stock vesting are recorded directly to stockholders' equity when realized. The Company uses a “with-and-without” method to determine the tax benefit realized from excess stock option deductions under the FASB's updated authoritative guidance on share-based payments. Accordingly, the Company recognizes the benefits of carryforwards in the following order: (a) net operating losses from items other than excess stock option deductions; (b) other tax credit carryforwards from items other than excess stock option deductions; and (c) net operating losses from excess stock option deductions. The amount of excess tax benefits not included in the deferred tax assets were $19.6 million and $17.9 million as of December 31, 2016 and 2015 , respectively. As of December 31, 2016 , the excess tax benefits not recognized are related to net operating losses of $34.4 million (tax effect of $12.8 million ) and foreign tax credits of $4.2 million . The Company has not recorded a deferred tax liability for undistributed earnings of $10.2 million of certain foreign subsidiaries, since such earnings are considered to be reinvested indefinitely. If the earnings were distributed, the Company would be subject to federal income and foreign withholding taxes. Determination of an unrecognized deferred income tax liability with respect to such earnings is not practicable. Under the provisions of Internal Revenue Code Section 382, certain substantial changes in the Company’s ownership may result in a limitation on the amount of U.S. net operating loss carryforwards that could be utilized annually to offset future taxable income and taxes payable. A portion of the Company’s net operating loss carryforwards are subject to an annual limitation under Section 382 of the Internal Revenue Code. The Company does not expect that this limitation will impact its ability to utilize all of our net operating losses prior to their expiration. A deferred tax asset should be reduced by a valuation allowance if, based on the weight of all available evidence, it is more likely than not (a likelihood of more than 50%) that some portion or the entire deferred tax asset will not be realized. The valuation allowance should be sufficient to reduce the deferred tax asset to the amount that is more likely than not to be realized. The determination of whether a deferred tax asset is realizable is based on weighting all available evidence, including both positive and negative evidence. The realization of deferred tax assets, including carryforwards and deductible temporary differences, depends upon the existence of sufficient taxable income of the same character during the carryback or carryforward period. The accounting guidance requires the consideration of all sources of taxable income available to realize the deferred tax asset, including the future reversal of existing temporary differences, future taxable income exclusive of reversing temporary differences and carryforwards, taxable income in carryback years and tax-planning strategies. As of December 31, 2016 , the Company has a remaining valuation allowance of $1.8 million , which relates to certain foreign NOLs that are not more likely than not to be realized. The Company will continue to evaluate the need for a valuation allowance in foreign jurisdictions and may remove the valuation allowance in subsequent periods, which may have an impact on the results of operations. The following table presents the provisions for income taxes compared with income taxes based on the federal statutory tax rate of 35% (in thousands): Year ended December 31, 2016 2015 2014 Tax provision (benefit) based on federal statutory rate $ 800 $ 50 $ (666 ) State taxes 411 490 430 Impact of foreign operations 180 201 (508 ) Other permanent items 414 144 193 IRC 162(m) add back 699 222 456 Stock-based compensation 1,202 1,096 1,002 Change in income tax valuation allowance 1,506 16 (2,804 ) Business tax credits (4,357 ) (2,302 ) (2,314 ) Finland intellectual property transfer (387 ) (324 ) (81 ) Meals and entertainment 464 432 198 Acquisition costs 163 248 128 Change in tax rates 365 (309 ) 1,767 Provision for (benefit from) income taxes $ 1,460 $ (36 ) $ (2,199 ) The Company has separately disclosed the tax effect of items in excess of $0.3 million . Accounting for Uncertainty in Income Taxes The Company applies guidance for uncertainty in income taxes that requires the application of a more likely than not threshold to the recognition and de-recognition of uncertain tax positions. If the recognition threshold is met, this guidance permits the Company to recognize a tax benefit measured at the largest amount of the tax benefit that, in the Company’s judgment, is more likely than not to be realized upon settlement. During the year ended December 31, 2016, the Company's unrecognized income tax benefits increased primarily due to an increase in our research and development tax credit study for 2016 and prior years, permanent establishment exposure for a few of our branches, as well as an anticipated accounting method change for our US jurisdictions. During the years ended December 31, 2015 and 2014, there was no material adjustment in the liability for unrecognized income tax benefits. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands): Year ended December 31, 2016 2015 2014 Unrecognized tax benefits balance at January 1, $ 4,927 $ 4,619 $ 4,875 Additions for tax positions of prior years 1,395 413 243 Additions for tax provisions of current year 2,449 453 — Settlements of tax positions of prior years (146 ) (558 ) (499 ) Unrecognized tax benefits balance at December 31, $ 8,625 $ 4,927 $ 4,619 The amount of the unrecognized tax benefit if realized that would impact the rate is $6.8 million , $4.9 million and $4.6 million for years ended December 31, 2016, 2015 and 2014 respectively. The Company records interest and penalties as a component of its income tax provision. The Company recorded interest and penalties of $0.4 million and $0.1 million for the years ended December 31, 2016 and 2015. The Company had not accrued interest with respect to uncertain tax positions in the prior years because unfavorable resolution of those positions would not result in cash tax due for those prior years. The Company files income tax returns in the United States and in various foreign jurisdictions. The Company is no longer subject to U.S. Federal income tax examinations for years prior to 2013, with the exception that operating loss or tax credit carryforwards generated prior to 2013 may be subject to tax audit adjustment. The Company is no longer subject to state and local or foreign income tax examinations by tax authorities for years prior to 2009.

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Borrowings	Borrowings 2022 Convertible Senior Notes In September 2015, the Company issued $201.3 million aggregate principal amount of 1.00% convertible senior notes due in 2022 (the “2022 Notes”). The 2022 Notes are general unsecured obligations of the Company, with interest payable semi-annually in cash at a rate of 1.00% per annum, and will mature on September 1, 2022 , unless earlier converted, redeemed or repurchased. The 2022 Notes may be converted by the holders at their option on any day prior to the close of business on the business day immediately preceding June 1, 2022 only under the following circumstances: (a) during any calendar quarter commencing after the calendar quarter ended on December 31, 2015 (and only during such calendar quarter), if the last reported sale price of the common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; (b) during the five business day period after any ten consecutive trading day period (the “measurement period”) in which the trading price, as defined in the indenture governing the 2022 Notes (the "2022 Indenture"), per $1,000 principal amount of 2022 Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company's common stock and the conversion rate on each such trading day; (c) if the Company calls any or all of the 2022 Notes for redemption, at any time prior to the close of business on the second scheduled trading day immediately preceding the relevant redemption date; or (d) upon the occurrence of specified corporate events. The 2022 Notes will be convertible, regardless of the foregoing circumstances, at any time from, and including, June 1, 2022 through the second scheduled trading day immediately preceding the maturity date. The initial conversion rate for the 2022 Notes is 25.8249 shares of the Company’s common stock per $1,000 principal amount of 2022 Notes, equivalent to a conversion price of $38.72 per share of common stock. The conversion rate will be subject to adjustment in some events, but will not be adjusted for any accrued and unpaid interest. In addition, following certain corporate events that occur prior to the maturity date or if the Company issues a notice of redemption on or after September 1, 2019 as described below, the Company will increase the conversion rate for a holder who elects to convert its 2022 Notes in connection with such a corporate event or during the related redemption period in certain circumstances. Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of the Company's common stock or a combination of cash and shares of the Company's common stock, at the Company's election. It is the Company's current intent to settle conversions through combination settlement with a specified dollar amount per $1,000 principal amount of 2022 Notes of $1,000 . While the 2022 Notes were not convertible as of December 31, 2016 , if the 2022 Notes were convertible, shares would have been distributed upon conversion because the conversion price was below the stock price as of such date . Holders of the 2022 Notes may require the Company to repurchase some or all of the 2022 Notes for cash upon a fundamental change, as defined in the 2022 Indenture, at a repurchase price equal to 100% of the principal amount of the 2022 Notes being repurchased, plus any accrued and unpaid interest up to, but excluding, the relevant repurchase date. The Company may not redeem the 2022 Notes prior to September 1, 2019. Beginning September 1, 2019, the Company may redeem for cash all or a portion of the 2022 Notes, at the Company's option, if the last reported sale price of the common stock is equal to or greater than 140% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending within the five trading days immediately preceding the date on which the Company provides notice of redemption, at a redemption price equal to 100% of the principal amount of the 2022 Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date. No sinking fund is provided for the 2022 Notes. The Company has separately accounted for the liability and equity components of the convertible debt instrument by allocating the gross proceeds from the issuance of the 2022 Notes between the liability component and the embedded conversion option, or equity component. This allocation was done by first estimating an interest rate at the time of issuance for similar notes that do not include the embedded conversion option. This interest rate, estimated at 7.4% , was used to compute the initial fair value of the liability component of $131.3 million . The excess of the gross proceeds received from the issuance of the 2022 Notes over the initial amount allocated to the liability component of $70.0 million was allocated to the embedded conversion option, or equity component. This excess is reported as a debt discount and will be subsequently amortized as interest expense, using the effective interest method, through September 2022, the maturity date of the 2022 Notes. Offering costs, consisting of the initial purchasers’ discount and offering expenses payable by the Company, were $6.4 million . These offering costs were allocated to the liability component and the equity component based on the relative valuations of such components. As a result, $4.2 million of the offering costs were classified as debt issuance costs and recorded on the balance sheet as a deduction from the carrying amount of the 2022 Notes liability. The remaining $2.2 million of offering costs were allocated to the equity component. The fair value of the 2022 Notes as of December 31, 2016 and 2015 was $241.5 million and $221.1 million , respectively. The carrying amount of the equity component of the 2022 Notes was $59.5 million at December 31, 2016 . The unamortized offering costs classified as debt issuance costs and recorded as a direct deduction to the carrying amount of the debt liability at December 31, 2016 were $3.4 million , which are being amortized as interest expense through the September 2022 maturity date of the 2022 Notes. 2018 Convertible Senior Notes In June 2011, the Company issued $120.0 million aggregate principal amount of 1.50% convertible senior notes due in 2018 (the “2018 Notes”). The 2018 Notes are senior unsecured obligations of the Company, with interest payable semi-annually in cash at a rate of 1.50% per annum, and will mature on July 1, 2018 , unless earlier repurchased, redeemed or converted. Concurrently with the closing of the 2022 Notes offering, the Company repurchased $50.9 million principal amount of the 2018 Notes in privately negotiated transactions for an aggregate purchase price of $53.4 million . The Company recorded an extinguishment loss of $4.2 million on the repurchase, including $0.5 million associated with unamortized issuance costs. This loss was recorded in other expense within the consolidated statement of operations. The remaining purchase price was allocated between the liability component and the equity component based upon the fair value of the debt immediately prior to the repurchase at $42.4 million and $6.8 million , respectively. The 2018 Notes may be converted by the holders at their option on any day prior to the close of business on the scheduled trading day immediately preceding April 1, 2018 only under the following circumstances: (a) during the five business-day period after any ten consecutive trading-day period (the “measurement period”) in which the trading price per Note for each day of that measurement period was less than 98% of the product of the last reported sale price of the common stock and the applicable conversion rate on each such day; (b) during any calendar quarter (and only during such quarter) after the calendar quarter ended September 30, 2011, if the last reported sale price of the common stock for 20 or more trading days in a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter exceeds 130% of the applicable conversion price in effect on the last trading day of the immediately preceding calendar quarter; (c) upon the occurrence of specified corporate events; or (d) if the Company calls the 2018 Notes for redemption. The 2018 Notes will be convertible, regardless of the foregoing circumstances, at any time from, and including, April 1, 2018 through the second scheduled trading day immediately preceding the maturity date. The initial conversion rate for the 2018 Notes is 23.8126 shares of the Company’s common stock per $1,000 principal amount of 2018 Notes, equivalent to a conversion price of $41.99 per share of the common stock. The conversion price will be subject to adjustment in some events, but will not be adjusted for accrued interest. In addition, if a make-whole fundamental change, as defined in the indenture governing the 2018 Notes (the “2018 Indenture”), occurs prior to the maturity date, the Company will in some cases increase the conversion rate for a holder that elects to convert its 2018 Notes in connection with such make-whole fundamental change. Upon conversion, the Company will pay cash up to the aggregate principal amount of the 2018 Notes to be converted and deliver shares of the common stock in respect of the remainder, if any, of the conversion obligation in excess of the aggregate principal amount of the 2018 Notes being converted. While the 2018 Notes were not convertible as of December 31, 2016 , if the 2018 Notes were convertible, shares would have been distributed upon conversion because the conversion price was below the stock price as of such date . Holders of the 2018 Notes may require the Company to repurchase some or all of the 2018 Notes for cash, subject to certain exceptions, upon a fundamental change, as defined in the 2018 Indenture, at a repurchase price equal to 100% of the principal amount of the 2018 Notes being repurchased, plus any accrued and unpaid interest up to but excluding the relevant repurchase date. The Company may not redeem the 2018 Notes prior to July 1, 2015. Beginning July 1, 2015, the Company may redeem for cash all or part of the 2018 Notes (except for the 2018 Notes that the Company is required to repurchase as described above) if the last reported sale price of the common stock exceeds 140% of the applicable conversion price for 20 or more trading days in a period of 30 consecutive trading days ending on the trading day immediately prior to the date of the redemption notice. The redemption price will equal the sum of 100% of the principal amount of the 2018 Notes to be redeemed, plus accrued and unpaid interest, plus a “make-whole premium” payment. The Company must make the make-whole premium payments on all 2018 Notes called for redemption prior to the maturity date, including 2018 Notes converted after the date the Company delivered the notice of redemption. The Company has separately accounted for the liability and equity components of the convertible debt instrument by allocating the gross proceeds from the issuance of the 2018 Notes between the liability component and the embedded conversion option, or equity component. This allocation was done by first estimating an interest rate at the time of issuance for similar notes that do not include the embedded conversion option. This interest rate, estimated at 8% , was used to compute the initial fair value of the liability component of $79.4 million . The excess of the gross proceeds received from the issuance of the 2018 Notes over the initial amount allocated to the liability component of $40.6 million , was allocated to the embedded conversion option, or equity component. This excess is reported as a debt discount and subsequently amortized as interest expense, using the effective interest method, through July 2018, the maturity date of the 2018 Notes. Offering costs, consisting of the initial purchasers’ discount and offering expenses payable by the Company, were $4.3 million . These offering costs were allocated to the liability component and the equity component based on the relative valuations of such components. As a result, $2.9 million of the offering costs were classified as debt issuance costs and recorded on the balance sheet as a deduction from the carrying amount of the 2018 Notes liability. The remaining $1.4 million of offering costs were allocated to the equity component. Concurrently with the closing of the 2022 Notes offering, the Company repurchased $50.9 million principal amount of the 2018 Notes in privately negotiated transactions for an aggregate purchase price of $53.4 million . The Company recorded an extinguishment loss of $4.2 million on the repurchase, including $0.5 million associated with unamortized issuance costs. This loss was recorded in other expense within the consolidated statement of operations. The remaining purchase price was allocated between the liability component and the equity component based upon the fair value of the debt immediately prior to the repurchase at $42.4 million and $6.8 million , respectively. The fair value of the 2018 Notes as of December 31, 2016 and 2015 was $80.2 million and $75.3 million , respectively. The carrying amount of the equity component of the Notes was $6.1 million at December 31, 2016 . The unamortized offering costs at December 31, 2016 were $0.4 million which are being amortized as interest expense through the July 2018 maturity date of the Notes. The following table shows the amounts recorded within the Company’s financial statements with respect to the combined 2022 Notes and 2018 Notes (collectively, the "Notes") (in thousands): December 31, December 31, Convertible debt principal $ 270,355 $ 270,355 Unamortized debt discount (65,590 ) (77,440 ) Unamortized debt issuance costs (3,750 ) (4,584 ) Net carrying amount of convertible debt $ 201,015 $ 188,331 The following table presents the interest expense recognized related to the Notes (in thousands): Year ended December 31, 2016 2015 2014 Contractual interest expense $ 3,049 $ 2,039 $ 1,800 Amortization of debt issuance costs 834 1,022 406 Accretion of debt discount 11,847 7,595 5,500 Interest expense $ 15,730 $ 10,656 $ 7,706 The net proceeds from the 2018 Note and 2022 Note offerings were $115.7 million and $194.8 million , respectively, after deducting discounts to the initial purchasers and offering expenses payable by the Company. Fair Value of Borrowings Fair value for the Company’s borrowings is estimated using quoted market price of the Notes at December 31, 2016 and 2015 , quoted market prices for similar instruments and by observable market data. The Company believes its creditworthiness and the financial market in which it operates has not materially changed since entering into the arrangements. If measured at fair value in the financial statements, long-term debt (including the current portion) would be classified as Level 2 in the fair value hierarchy. The aggregate maturities of borrowings as of December 31, 2016 were as follows (in thousands): 2017 $ — 2018 69,105 2019-2020 — 2021 and thereafter 201,250 $ 270,355

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2016
Stockholders' Equity Note [Abstract]
Stockholders' Equity	Stockholders’ Equity Preferred Stock Pursuant to the Company’s amended and restated certificate of incorporation filed on June 21, 2010, the Company is authorized to issue 5,000,000 shares of preferred stock. The board of directors has the authority, without action by its stockholders, to designate and issue shares of preferred stock in one or more series and to fix the rights, preferences, privileges and restrictions thereof. These rights, preferences and privileges could include dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences, sinking fund terms and the number of shares constituting any series or the designation of such series, any or all of which may be greater than the rights of common stock. The issuance of the Company’s preferred stock could adversely affect the voting power of holders of common stock and the likelihood that such holders will receive dividend payments and payments upon liquidation and could have the effect of delaying, preventing or deterring a change in control. To date, the board of directors has not designated any rights, preference or powers of any preferred stock and no shares of preferred stock have been issued.

Stock-based Compensation

Stock-based Compensation	12 Months Ended
	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based Compensation	Stock-based Compensation Equity Incentive Plans In 1999, the Company adopted the 1999 Stock Incentive Plan (the “1999 Plan”). The 1999 Plan provided for the grant of incentive stock options, nonqualified stock options, restricted stock awards and stock appreciation rights. The 1999 Plan terminated in June 2009 whereby no new options or awards are permitted to be granted. In April 2009, the Company adopted the 2009 Equity Incentive Plan. This plan provides for the grant of incentive stock options, nonqualified stock options, restricted stock awards, RSUs and stock appreciation rights. In June 2010, the 2009 Equity Incentive Plan was amended and restated to provide for, among other things, annual increases in the share reserve (as amended and restated, the “2009 Plan”). The term of stock-based grants is up to ten years , except that certain stock-based grants made after 2005 have a term of five years . For grants made under the 2009 Plan prior to January 1, 2015, the requisite vesting period is typically four years and for grants made subsequent to January 1, 2015, the requisite vesting period is typically three years . On each of January 1, 2015 and 2016, 1,250,000 shares were added to the 2009 Plan. At December 31, 2016 , the Company had 708,642 shares of common stock available for issuance under the 2009 Plan. Stock-based compensation expense recognized by the Company is as follows (in thousands): Year ended December 31, 2016 2015 2014 Stock options $ 8,156 $ 7,572 $ 6,814 Restricted stock units 41,727 31,719 19,585 Performance stock units 1,624 1,153 3,874 Total recognized stock-based compensation expense $ 51,507 $ 40,444 $ 30,273 Stock Options The following table presents a summary related to stock options for the year ended December 31, 2016 : Number of Options Outstanding Weighted Average Exercise Price Weighted Average Remaining Contractual Term (years) Aggregate Intrinsic Value (in thousands) Balance, December 31, 2015 1,999,875 $ 29.48 Granted 617,950 37.62 Exercised (474,409 ) 32.00 Forfeited (148,697 ) 32.65 Expired (10,436 ) 32.79 Balance, December 31, 2016 1,984,283 $ 31.15 7.26 $ 20,798 Vested and exercisable at December 31, 2016 975,131 $ 27.67 5.69 $ 13,243 In 2016 , 2015 and 2014 , the Company granted stock options with a weighted-average grant date fair value of $16.60 , $15.75 and $12.91 , respectively. The intrinsic value of stock options exercised in 2016 , 2015 and 2014 was $4.9 million , $5.2 million and $1.6 million , respectively, and cash received from stock options exercised was $15.2 million , $6.2 million and $0.7 million , respectively. At December 31, 2016 , unrecognized stock-based compensation expense, net of estimated forfeitures, relating to unvested stock options was $13.2 million which amount is scheduled to be recognized as stock-based compensation expense over a weighted average period of 1.9 years . To the extent the actual forfeiture rate is different than what the Company has anticipated at December 31, 2016 , stock-based compensation expense will differ from expectations. Restricted Stock Units The following table presents a summary of activity for RSUs (excluding RSUs that are subject to performance-based vesting conditions): Number of RSUs Weighted Average Grant Date Fair Value Balance, December 31, 2015 1,512,022 $ 33.20 Granted 1,567,621 38.27 Vested (1,112,838 ) 34.47 Forfeited (107,394 ) 34.71 Balance, December 31, 2016 1,859,411 $ 36.63 The RSUs generally vest over three or four years from the vesting commencement date and on vesting the holder receives one share of Company common stock for each RSU. At December 31, 2016 , unrecognized stock-based compensation expense related to unvested RSUs was $53.2 million , which is scheduled to be recognized over a weighted average period of 1.9 years . To the extent the actual forfeiture rate is different than what the Company has anticipated at December 31, 2016 , stock-based compensation expense will differ from expectations. Performance Stock Units The following table presents a summary of activity for PSUs: Number of PSUs Weighted Average Grant Date Fair Value Balance, December 31, 2015 550,088 $ 26.87 Granted 5,000 45.90 Vested (116,506 ) 30.13 Forfeited (33,798 ) 23.72 Balance, December 31, 2016 404,784 $ 26.44 The PSUs generally vest over three or four years from the vesting commencement date, subject to the satisfaction of certain performance conditions, and on vesting the holder receives one share of Company common stock for each PSU. At December 31, 2016 , unrecognized stock-based compensation expense related to unvested PSUs was $0.3 million , which is scheduled to be recognized over a weighted average period of 0.6 years . Tax Benefits Upon adoption of the FASB’s guidance on stock-based compensation, the Company elected the alternative transition method (short cut method) provided for calculating the tax effects of stock-based compensation. The alternative transition method includes simplified methods to establish the beginning balance of the additional paid-in capital pool (“APIC pool”) related to the tax effects of employee stock-based compensation, and to determine the subsequent impact on the APIC pool and consolidated statements of cash flows related to the tax effect of employee stock-based compensation awards that are outstanding upon adoption. As of December 31, 2016 , the Company’s APIC pool balance was $11.2 million . The Company applies a with-and-without approach in determining its intra-period allocation of tax expense or benefit attributable to stock-based compensation deductions. Tax deductions in excess of previously recorded benefits (windfalls) included in net operating loss carryforwards but not reflected in deferred tax assets for the years ended December 31, 2016 and 2015 are $55.5 million and $50.4 million , respectively.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Leases The Company leases office space under non-cancelable operating leases with various expiration dates through 2024. Rent expense was $5.7 million , $4.7 million and $3.6 million for the years ended December 31, 2016 , 2015 and 2014 , respectively. The following table presents future minimum lease payments under the non-cancelable operating leases (in thousands): Operating Leases Years Ending December 31: 2017 $ 5,807 2018 5,024 2019 3,171 2020 2,132 2021 and thereafter 5,429 Total future minimum lease payments $ 21,563 Indemnifications and Contingencies In the normal course of business, the Company enters into contracts and agreements that may contain representations and warranties and provide for general indemnifications. The Company’s exposure under these agreements is unknown because it involves claims that may be made in the future, but have not yet been made. The Company has not paid any material settlement amounts related to indemnification obligations to date. In accordance with its bylaws and certain agreements, the Company has indemnification obligations to its officers and directors for certain events or occurrences, subject to certain limits, while they are serving at the Company’s request in such capacity. There have been no claims to date under these indemnification obligations. In addition, the Company is involved in litigation incidental to the conduct of its business. The Company is not a party to any lawsuit or proceeding that, in the opinion of management, is probable to have a material adverse effect on its financial position, results of operations or cash flows.

Segment and Geographic Informat

Segment and Geographic Information	12 Months Ended
	Dec. 31, 2016
Segment Reporting [Abstract]
Segment and Geographic Information	Segment and Geographic Information Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker, in deciding how to allocate resources and in assessing performance. The Company’s chief operating decision maker is its Chief Executive Officer (“CEO”). The CEO reviews financial information presented on a consolidated basis, along with information about revenue by geographic region for purposes of allocating resources and evaluating financial performance. Discrete information on a geographic basis, except for revenue, is not provided below the consolidated level to the CEO. The Company has concluded that it operates in one segment and has provided the required enterprise-wide disclosures. Revenue by geographic area is based on the location of the end-user carrier. The following table presents revenue and long-lived assets, net, by geographic area (in thousands): Year Ended December 31, 2016 2015 2014 Revenue: North America $ 192,824 $ 180,791 $ 112,198 EMEA 98,138 61,187 54,950 Emerging Markets 50,000 36,865 49,709 Total revenue $ 340,962 $ 278,843 $ 216,857 North America includes $ 177.5 million , $172.0 million and $106.8 million of United States revenue for the years ended December 31, 2016 , 2015 and 2014 . December 31, December 31, Long-Lived Assets, net North America $ 22,909 $ 21,135 EMEA 4,683 5,008 Emerging Markets 2,932 1,171 Total long-lived assets, net $ 30,524 $ 27,314 North America includes $22.6 million and $20.9 million of United States long-lived assets as of December 31, 2016 and 2015 .

401(k) Defined Contribution Pla

401(k) Defined Contribution Plan	12 Months Ended
	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
401(k) Defined Contribution Plan	401(k) Defined Contribution Plan The Company maintains a tax-qualified 401(k) retirement plan that provides eligible U.S. employees with an opportunity to save for retirement on a tax advantaged basis. The Company has a 401(k) plan covering all eligible employees. Beginning January 1, 2012, the Company matches a portion of the employees’ eligible contributions according to the 401(k) plan document. Matching contributions to the plan during the years ended December 31, 2016 , 2015 and 2014 were $2.1 million , $1.8 million and $0.8 million , respectively.

Quarterly Financial Data (Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data (Unaudited)	Quarterly Financial Data (Unaudited) (in thousands, except per share data): March 31, 2016 June 30, 2016 September 30, 2016 December 31, 2016 Total revenue $ 73,136 $ 81,721 $ 84,122 $ 101,983 Gross profit 52,338 59,175 60,369 77,903 Income (loss) from operations (419 ) 553 1,567 13,806 Net income (loss) (1,509 ) (2,895 ) (605 ) 5,826 Net income (loss) per share: Basic $ (0.05 ) $ (0.10 ) $ (0.02 ) $ 0.19 Diluted $ (0.05 ) $ (0.10 ) $ (0.02 ) $ 0.18 March 31, June 30, September 30, December 31, Total revenue $ 55,671 $ 64,484 $ 69,097 $ 89,591 Gross profit 39,661 44,249 47,451 69,724 Income (loss) from operations (1,275 ) (4,928 ) 822 20,624 Net income (loss) (2,905 ) (5,288 ) (3,250 ) 11,622 Net income (loss) per share: Basic $ (0.10 ) $ (0.18 ) $ (0.11 ) $ 0.40 Diluted $ (0.10 ) $ (0.18 ) $ (0.11 ) $ 0.39

Schedule II - Consolidated Valu

Schedule II - Consolidated Valuation Allowance and Qualifying Accounts	12 Months Ended
	Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract]
Schedule II - Consolidated Valuation Allowance and Qualifying Accounts	SCHEDULE II—CONSOLIDATED VALUATION AND QUALIFYING ACCOUNTS (In thousands) Balance at Beginning of Year Amounts Charged to Operations (1) Deductions (2) Additions Acquired from Business Combinations Balance at End of Year Allowance for doubtful accounts: Year Ended December 31, 2014 128 274 (116 ) — 286 Year Ended December 31, 2015 286 4 (205 ) — 85 Year Ended December 31, 2016 85 313 (290 ) — 108 Allowance for deferred tax assets: Year Ended December 31, 2014 3,297 (3,033 ) — — 264 Year Ended December 31, 2015 264 5 — 43 312 Year Ended December 31, 2016 312 1,652 (151 ) — 1,813 _______________________ (1) Amount represents charges to bad debt and increase to or (release of) our valuation allowance. (2) Amount represents recoveries of accounts receivable previously charged to the allowance and utilization of net operating losses against the valuation allowance.

Summary of Significant Accoun24

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The accompanying consolidated financial statements include the accounts and results of operations of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in the accompanying consolidated financial statements.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with United States generally accepted accounting principles (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual amounts could differ from these estimates.
Cash Equivalents	Cash Equivalents The Company considers all highly liquid instruments purchased with an original maturity of three months or less to be cash equivalents. Cash equivalents are held in money market accounts.
Investments in Marketable Securities	Investments in Marketable Securities Marketable debt securities that the Company does not intend to hold to maturity are classified as available-for-sale, are carried at fair value and are included on the Company’s consolidated balance sheet as either short-term or long-term investments depending on their maturity. Investments with original maturities greater than three months that mature less than one year from the consolidated balance sheet date are classified as short-term investments. Investments with maturities greater than one year from the consolidated balance sheet date are classified as long-term investments. Available-for-sale investments are marked-to-market at the end of each reporting period, with unrealized holding gains or losses, which represent temporary changes in the fair value of the investment, reflected in accumulated other comprehensive income (loss), a separate component of stockholders’ equity. The transfers from accumulated other comprehensive income into net income is immaterial. The Company’s primary objective when investing excess cash is preservation of principal.
Fair Value Measurements	Fair Value Measurements The carrying amounts of the Company’s other financial instruments, accounts receivable, accounts payable and accrued expenses, approximate their respective fair values due to their short term nature. (See Note 9 Borrowings for additional information on fair value of debt.) The Company uses a three-tier fair value measurement hierarchy to classify and disclose all assets and liabilities measured at fair value on a recurring basis, as well as assets and liabilities measured at fair value on a non-recurring basis, in periods subsequent to their initial measurement. The three tiers are defined as follows: • Level 1 . Observable inputs based on unadjusted quoted prices in active markets for identical instruments and include the Company’s investments in money market funds and certificates of deposit; • Level 2 . Inputs valued using quoted market prices for similar instruments, nonbinding market prices that are corroborated by observable market data and include the Company’s investments and marketable securities in U.S. agency notes, commercial paper and corporate bonds; and • Level 3 . Unobservable inputs for which there is little or no market data, which require the Company to develop its own assumptions. Assets Measured at Fair Value on a Recurring Basis The Company evaluates its financial assets subject to fair value measurements on a recurring basis to determine the appropriate level of classification for each reporting period. This determination requires significant judgments to be made. There were no transfers between classification levels during the periods. Assets Measured at Fair Value on a Nonrecurring Basis The Company measures certain assets, including property and equipment, goodwill and intangible assets, at fair value on a nonrecurring basis. These assets are recognized at fair value when they are deemed to be impaired.
Concentration of Credit Risk	Concentration of Credit Risk Financial instruments that subject the Company to significant concentrations of credit risk consist primarily of cash and cash equivalents, marketable securities and accounts receivable. All of the Company’s cash and cash equivalents and marketable securities are held at financial institutions that management believes to be of high credit quality. The Company’s cash and cash equivalent accounts may exceed federally insured limits at times. The Company has not experienced any losses on cash and cash equivalents to date. To manage accounts receivable risk, the Company evaluates the creditworthiness of its customers and maintains an allowance for doubtful accounts.
Accounts Receivable and Allowance for Doubtful Accounts	Accounts Receivable and Allowance for Doubtful Accounts Accounts receivable are derived from sales to customers. Each customer is evaluated for creditworthiness through a credit review process at the time of each order. Accounts receivable are stated at realizable value, net of an allowance for doubtful accounts that is maintained for estimated losses that would result from the inability of some customers to make payments as they become due. The allowance is based on an analysis of past due amounts and ongoing credit evaluations. Collection experience has been consistent with the Company’s estimates.
Property and Equipment	Property and Equipment Property and equipment are stated at cost, less accumulated depreciation and amortization. Replacements and major improvements are capitalized; maintenance and repairs are charged to expense as incurred. Depreciation is calculated using the straight-line method over the estimated useful lives of the related assets per the table below: Equipment 3 - 5 years Software 1.5 - 3 years Furniture and fixtures 5 years Leasehold improvements are amortized over the shorter of the term of the lease and the estimated useful life of the assets.
Business Combinations	Business Combinations In a business combination, the Company allocates the purchase price to the acquired business’ identifiable assets and liabilities at their acquisition date fair values. The excess of the purchase price over the amount allocated to the identifiable assets and liabilities, if any, is recorded as goodwill. The excess, if any, of the fair value of the identifiable assets acquired and liabilities assumed over the consideration transferred is recognized as a gain within other income in the consolidated statement of operations as of the acquisition date. To date, the assets acquired and liabilities assumed in the Company’s business combinations have primarily consisted of acquired working capital, definite-lived intangible assets and goodwill. The carrying value of acquired working capital approximates its fair value, given the short-term nature of these assets and liabilities. The Company estimates the fair value of definite-lived intangible assets acquired using a discounted cash flow approach, which includes an analysis of the future cash flows expected to be generated by such assets and the risk associated with achieving such cash flows. The key assumptions used in the discounted cash flow model include the discount rate that is applied to the discretely forecasted future cash flows to calculate the present value of those cash flows and the estimate of future cash flows attributable to the acquired intangible, which include revenue, operating expenses and taxes. The Company's estimates are inherently uncertain and subject to refinement. As a result, during the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the fair value of assets acquired and liabilities assumed, with the corresponding offset to goodwill.
Goodwill	Goodwill Goodwill represents the excess of (a) the aggregate of the fair value of consideration transferred in a business combination, over (b) the fair value of assets acquired, net of liabilities assumed. Goodwill is not amortized, but is subject to annual impairment tests as described below. The Company tests goodwill for impairment annually on December 31, or more frequently if events or changes in business circumstances indicate the asset might be impaired. The Company may first assess qualitative factors to determine if it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test included in U.S. GAAP. To the extent the assessment identifies adverse conditions, or if the Company elects to bypass the qualitative assessment, goodwill is tested for impairment at the reporting unit level using a two-step approach. The first step is to compare the fair value of the reporting unit to the carrying value of the net assets assigned to the reporting unit. If the fair value of the reporting unit is greater than the carrying value of the net assets assigned to the reporting unit, the assigned goodwill is not considered impaired. If the fair value is less than the reporting unit’s carrying value, step two is performed to measure the amount of the impairment, if any. In the second step, the fair value of goodwill is determined by deducting the fair value of the reporting unit’s identifiable assets and liabilities from the fair value of the reporting unit as a whole, as if the reporting unit had just been acquired and the purchase price were being initially allocated. If the carrying value of goodwill exceeds the implied fair value, an impairment charge would be recorded to operating expenses in the consolidated statement of operations in the period the determination is made. The Company has determined that it has one reporting unit, BroadSoft, Inc., which is the consolidated entity.
Identifiable Intangible Assets	Identifiable Intangible Assets The Company acquired intangible assets in connection with certain of its business acquisitions. These assets were recorded at their estimated fair values at the acquisition date and are amortized over their respective estimated useful lives using a method of amortization that reflects the pattern in which the economic benefits of the intangible assets are used. Estimated useful lives are determined based on the Company’s historical use of similar assets and the expectation of future realization of revenue attributable to the intangible assets. In those cases where the Company determines that the useful life of an intangible asset should be shortened, the Company amortizes the net book value in excess of the estimated salvage value over its revised remaining useful life. The Company did not revise the useful life estimates attributed to any of the Company’s intangible assets during the years ended December 31, 2016 , 2015 or 2014 . (See Note 4 Goodwill and Intangibles .) The estimated useful lives used in computing amortization are as follows: Customer relationships 3 - 8 years Developed technology 2 - 6 years Trade names 1 - 7 years
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets The Company reviews long-lived assets, including property and equipment and definite-lived intangible assets, for impairment whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of the assets to future undiscounted net cash flows expected to be generated by the assets. Recoverability measurement and estimating of undiscounted cash flows for assets to be held and used is done at the lowest possible levels for which there are identifiable cash flows. If such assets are considered impaired, the amount of impairment recognized would be equal to the amount by which the carrying amount of the assets exceeds the fair value of the assets, which the Company would compute using a discounted cash flow approach. Assets to be disposed of are recorded at the lower of the carrying amount or fair value less costs to sell.
Deferred Financing Costs	Deferred Financing Costs The Company amortizes deferred financing costs using the effective-interest method and records such amortization as interest expense.
Revenue Recognition	Revenue Recognition The Company’s revenue is generated from the sales of software licenses and related maintenance for those licenses, subscription and usage fees related to the SaaS offerings and professional services. The Company’s software licenses, subscription and maintenance contracts and professional services are sold directly through its own sales force and indirectly through distribution partners.
License Software	License Software Revenue from software licenses is recognized when the following four basic criteria are met as follows: • Persuasive evidence of an arrangement. For direct sales, an agreement signed by the Company and by the customer, in conjunction with a non-cancelable purchase order or executed sales quote from the customer, is deemed to represent persuasive evidence of an arrangement. For sales through distribution partners, a purchase order or executed sales quote, in conjunction with a reseller agreement with the distribution partner and evidence of the distribution partner's customer, is deemed to represent persuasive evidence of an arrangement. Revenue is deferred for sales through a distribution partner without proof of the distribution partner's customer. • Delivery has occurred. Delivery is deemed to have occurred when the customer is given electronic access to the licensed software and a license key for the software has been delivered or made available. If an arrangement contains a requirement to deliver additional elements essential to the functionality of the delivered element, revenue associated with the arrangement is recognized when delivery of the final element has occurred. • Fees are fixed or determinable. The Company considers the fee to be fixed or determinable unless the fee is subject to refund or adjustment or is not payable within normal payment terms. If the fee is subject to refund or adjustment, revenue is recognized when the refund or adjustment right lapses. If payment terms exceed the Company’s normal terms, revenue is recognized as the amounts become due and payable or upon the receipt of cash if collection is not probable. • Collection is probable. Each customer is evaluated for creditworthiness through a credit review process at the inception of an arrangement. Collection is deemed probable if, based upon the Company’s evaluation, the Company expects that the customer will be able to pay amounts under the arrangement as payments become due. If it is determined that collection is not probable, revenue is deferred and recognized upon cash collection. The warranty period for the Company’s licensed software is generally 90 days . The Company delivers its licensed software primarily by utilizing electronic media.
Subscription and Maintenance Support	Subscription and Maintenance Support The Company typically sells annual maintenance support contracts in combination with license software sales. Maintenance support enables the customer to continue receiving software maintenance and support after the warranty period has expired. Maintenance support is renewable at the option of the customer. When customers prepay for annual maintenance support, the related revenue is deferred and recognized ratably over the term of the maintenance period. Generally, rates for maintenance support, including subsequent renewal rates, are established based upon a specific percentage of net license fees as set forth in the arrangement. Maintenance support typically includes the right to unspecified product upgrades on an if-and-when available basis. The Company’s subscription revenue is generated from a recurring fee and/or a usage based fee from customers purchasing the Company's SaaS offerings. Under these arrangements, the Company is generally paid a recurring fee calculated based on the number of seats and type of service purchased or a usage fee based on the actual number of transactions. Revenue related to the recurring fee is recognized ratably over the contract term beginning with the date our service is made available to the customer. The usage fee is recognized as revenue in the period in which the transactions occur. Subscription agreements do not provide customers with the right to take possession of the underlying software at any time.
Professional Services and Other	Professional Services and Other Revenue from professional services includes implementation, training and consulting and design and customization services. Professional services are generally either daily-rate or fixed-fee arrangements. Revenue from daily-rate arrangements is typically recognized as services are performed. Revenue related to fixed-fee arrangements are typically recognized upon completion of all of the deliverables. Services are generally not considered essential to the functionality of the licensed software. Costs related to shipping and handling and billable travel expenses are included in cost of revenue.
Multiple Element Arrangements	Multiple Element Arrangements The Company accounts for multiple element arrangements that consist of software and software-related services, collectively referred to as “software elements,” in accordance with industry specific accounting guidance for software and software-related transactions. For such transactions, the Company generally allocates revenue to the software license by determining the fair value of the undelivered elements, which is usually maintenance support and professional services. The Company establishes vendor-specific objective evidence ("VSOE") of the fair value of the maintenance support based on the renewal price as stated in the agreement and as charged in the first optional renewal period under the arrangement. VSOE for professional services is determined based on an analysis of our historical daily rates when these professional services are sold separately from the software license. For the Company's cloud offering with multiple element arrangements that include subscription and professional services, the Company allocates revenue to all deliverables based on their relative selling prices. In such circumstances, the Company uses the following hierarchy to determine the selling price to be used for allocating revenue to deliverables (a) vendor-specific objective evidence of fair value, (b) third-party evidence of selling price and (c) best estimate of the selling price. Best estimate of selling price reflects the Company’s estimates of what the selling prices of elements would be if they were sold on a stand-alone basis. Factors considered by the Company in developing relative selling prices for products and services include the discounting practices, price lists, go-to-market strategy, historical standalone sales and contract prices.
Research and Development	Research and Development Research and development expenses consist primarily of personnel and related expenses for the Company's research and development staff, including salaries, benefits, bonuses and stock-based compensation and the cost of certain third-party contractors. Research and development costs, other than software development expenses qualifying for capitalization, are expensed as incurred.
Software Development Costs and Internal-Use Software Development Costs	Software Development Costs Software development costs for software to be sold, leased or marketed that is incurred prior to the establishment of technological feasibility are expensed as incurred as research and development expense. Software development costs incurred subsequent to the establishment of technological feasibility, if any, are capitalized until the software is available for general release to customers. The Company has determined that technological feasibility has been established at approximately the same time as the general release of such software to customers. Therefore, to date, the Company has not capitalized any related software development costs. Internal-Use Software Development Costs The Company capitalizes costs associated with customized internal-use software systems that have reached the application development stage. Such capitalized costs include costs directly associated with the development of the applications. Capitalization of such costs begins when the preliminary project stage is complete and ceases at the point the project is substantially complete and is ready for its intended purpose. Internal-use software is amortized on a straight-line basis over the estimated useful life. Costs incurred during the preliminary development stage, as well as maintenance and training costs, are expensed as incurred.
Deferred Revenue	Deferred Revenue Deferred revenue represents amounts billed to or collected from customers for which the related revenue has not been recognized because one or more of the revenue recognition criteria have not been met. The current portion of deferred revenue is expected to be recognized as revenue within 12 months from the balance sheet date.
Cost of Revenue	Cost of Revenue Cost of revenue includes (a) royalties and other fees paid to third parties whose technology or products are sold as part of the Company’s products, (b) direct costs to manufacture and distribute product, (c) direct costs to provide product support and professional support services, (d) direct costs associated with delivery of the Company's SaaS offerings and (e) amortization expense related to acquired intangible assets.
Income Taxes	Income Taxes The Company uses the liability method of accounting for income taxes as set forth in the authoritative guidance for accounting for income taxes. This method requires an asset and liability approach for the recognition of deferred tax assets and liabilities for the expected future tax consequences attributable to temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and their respective tax bases, and for operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured by applying enacted statutory tax rates applicable to the future years in which deferred amounts are expected to be settled or realized. The Company currently has significant deferred tax assets, primarily resulting from net operating loss carryforwards, deferred revenue and stock-based compensation expense. The Company has a valuation allowance of $1.8 million against its net deferred tax assets. Management weighs the positive and negative evidence to determine if it is more likely than not that some or all of the deferred tax assets will be realized. The Company accounts for uncertainty in income taxes using a two-step approach to recognize and measure tax benefits when the realization of the benefits is uncertain. The first step is to determine whether the benefit is to be recognized; the second step is to determine the amount to be recognized. Income tax benefits should be recognized when, based on the technical merits of a tax position, the entity believes that if a dispute arose with the taxing authority and were taken to a court of last resort, it is more likely than not (i.e., a probability of greater than 50 percent) that the tax position would be sustained as filed. If a position is determined to be more likely than not of being sustained, the reporting enterprise should recognize the largest amount of tax benefit that is greater than 50 percent likely of being realized upon ultimate settlement with the taxing authority. The Company’s practice is to recognize interest and penalties related to income tax matters in income tax expense.
Stock-Based Compensation	Stock-Based Compensation The Company applies the fair value method for determining the cost of stock-based compensation for employees, directors and consultants. Under this method, the total cost of a stock option grant is measured based on the estimated fair value of the stock option award at the date of the grant, using the Black-Scholes valuation model. The fair value of a restricted stock unit ("RSU") is based on the market value of the Company’s common stock on the date of grant. The fair value of a performance stock unit ("PSU") is based on the market price of the Company’s stock on the date of grant and assumes that the performance criteria will be met and the target payout level will be achieved. Compensation cost is adjusted for subsequent changes in the outcome of performance-related conditions until the award vests. The fair value of PSUs with a market condition is estimated on the date of award, using a Monte Carlo simulation valuation model to estimate the total return ranking of the Company’s stock in relation to the target index of companies over each performance period. Compensation cost on PSUs with a market condition is not adjusted for subsequent changes regardless of the level of ultimate vesting. For service only awards, the total cost related to the portion of awards granted that is ultimately expected to vest is recognized as stock-based compensation expense on a straight-line basis over the requisite service period of the grant. For PSUs, the total cost related to the portion of the awards granted that is ultimately expected to vest is recognized as stock-based compensation expense on a graded basis over the requisite service period of the grant. Estimated Fair Value of Share-Based Payments For awards granted subsequent to January 1, 2016, the Company used the Black-Scholes valuation model. For awards granted prior to January 1, 2016, the Company used the binomial options pricing model, or binomial lattice valuation model. The fair value of the stock option awards calculated using Black-Scholes valuation model is consistent with the fair value of the stock option awards calculated using binomial lattice valuation model. Black-Scholes valuation model requires the input of highly subjective assumptions, including the the expected term of the option, the expected volatility of the price of the Company's common stock, risk-free interest rates, and the expected dividend yield of the Company's common stock. The assumptions used in the Company valuation model represent management’s best estimates. These estimates involve inherent uncertainties and the application of management’s judgment. If factors change and different assumptions are used, our stock-based compensation expense could be materially different in the future. Fair value of the stock options was estimated at the grant date, using the following weighted average assumptions: Year ended December 31, 2016 2015 2014 Average assumptions: Risk-free interest rate 1.3 % 1.5 % 1.7 % Expected dividend yield — % — % — % Expected volatility 47 % 52 % 53 % Expected term (years) 5.6 years 6.9 years 7.6 years The Company has assumed no dividend yield because dividends are not expected to be paid in the near future, which is consistent with the Company’s history of not paying dividends. The risk-free interest rate assumption is based upon observed interest rates for constant maturity U.S. Treasury securities appropriate for the term of the Company’s employee stock options. The expected term of an option represents the period that Company's stock-based awards are expected to be outstanding and is calculated using a combination of historical exercise experience adjusted to reflect the current vesting period of options being valued, and partial life cycles of outstanding options. Expected volatility is based on the historical volatility of the Company and comparable public companies. The Company’s estimate of pre-vesting forfeitures, or forfeiture rate, is based on an analysis of historical behavior by option holders.
Net Income Per Common Share	Due to the settlement features of the Notes, the Company only includes the impact of the premium feature in the diluted earnings per common share calculation when the average stock price exceeds the conversion price of the Notes. Net Income Per Common Share Basic net income per common share is computed based on the weighted average number of outstanding shares of common stock. Diluted income per common share adjusts the basic weighted average common shares outstanding for the potential dilution that could occur if stock options, RSUs, PSUs and convertible securities were exercised or converted into common stock.
Foreign Currency	Foreign Currency The functional currency of operations located outside the United States is the respective local currency. The financial statements of each operation are translated into U.S. dollars using period-end exchange rates for assets and liabilities and average exchange rates during the period for revenue and expenses. Translation effects are included in accumulated other comprehensive income.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, the FASB issued Accounting Standards Update 2014-09, Revenue from Contracts with Customers: Topic 606 ("ASU 2014-09"), which supersedes nearly all existing revenue recognition guidance under U.S. GAAP. The core principle is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration that is expected to be received for those goods or services. The standard 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 U.S. GAAP, including identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. The standard allows entities to apply either of two methods: (a) retrospective application to each prior reporting period presented with the option to elect certain practical expedients as defined within ASU 2014-09 (''full retrospective method''); or (b) retrospective application with the cumulative effect of initially applying the standard recognized at the date of initial application and providing certain additional disclosures as defined per ASU 2014-09 (''modified retrospective method''). In August 2015, the FASB issued Accounting Standards Update 2015-14, Revenue from Contracts with Customers: Topic 606 ("ASU 2015-14"), which defers the effective date for ASU 2014-09 to annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. While we have not yet completed our final review of the impact of the new standard, we expect that the new standard will impact the timing of revenue recognition for certain software and software related contracts. Due to the complexity of our contracts, the actual timing of revenue recognition required under the new standard will be dependent on contract-specific terms. We are still in the process of evaluating the impact of the new standard related to costs incurred to fulfill a contract. We will adopt the new standard on January 1, 2018 using the modified retrospective method. We will continue to evaluate the standard as well as additional changes, modifications or interpretations that may impact our current conclusions. In February 2016, the FASB issued Accounting Standards Update 2016-02, Leases: Topic 842 ("ASU 2016-02"), which provides updated guidance on lease accounting. ASU 2016-02 is effective for annual reporting periods beginning after December 15, 2018, including interim periods within that annual period, with early adoption permitted. The Company is evaluating the impact of adopting this new standard on its financial statements. In March 2016, the FASB issued Accounting Standards Update 2016-09, Compensation-Stock Compensation: Topic 718 ("ASU 2016-09"), which provides updated guidance on several aspects of the accounting for share-based payment transactions. ASU 2016-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods within those annual periods, with early adoption permitted. The Company will adopt this guidance on January 1, 2017. The Company is unable to estimate the impact of adoption as it is dependent upon future stock option exercises which can not be predicted. In August 2016, the FASB issued Accounting Standards Update 2016-16, Income Taxes: Topic 740: Intra-Entity Transfers of Assets Other Than Inventory (“ASU 2016-16”) which requires the recognition of the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The new standard is effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within those annual reporting periods, with early adoption permitted. The Company is evaluating the impact of adopting this new standard on its financial statements. In January 2017, the FASB issued Accounting Standards Update 2017-01, Business Combinations: Topic 805: Clarifying the Definition of a Business (“ASU 2017-01”), which clarifies the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The new standard is effective for annual periods beginning after December 15, 2017, including interim periods within those periods. The Company is evaluating the impact of adopting this new standard on its financial statements. In January 2017, the FASB issued Accounting Standards Update 2017-04, Intangibles - Goodwill and Other: Topic 350: Simplifying the Test for Goodwill Impairment (“ASU 2017-04”), which modifies the concept of impairment from the condition that exists when the carrying amount of goodwill exceeds its implied fair value to the condition that exists when the carrying amount of a reporting unit exceeds its fair value. The new standard is effective for annual periods beginning after December 15, 2019, including interim periods within those periods. While the Company continues to assess the potential impact of this standard, the adoption of this standard is not expected to have a material impact on its financial statements.

Summary of Significant Accoun25

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Summary of Long-Term Investments	The following table summarizes the Company's investments: December 31, 2016 December 31, 2015 Contracted Maturity Carrying Value Contracted Maturity Carrying Value (in thousands) (in thousands) Money market funds demand $ 44,962 demand $ 123,170 Total cash equivalents $ 44,962 $ 123,170 U.S. agency notes 120 - 156 days 60,103 50 - 365 days 39,467 Commercial paper 137 days 1,993 — Corporate bonds 10 - 363 days 66,820 12 - 319 days 33,064 Asset-backed securities 107 - 258 days 7,512 — Total short-term investments $ 136,428 $ 72,531 U.S. agency notes 380 - 516 days 93,922 486 - 851 days 44,175 Corporate bonds 381 - 488 days 42,202 376 - 846 days 58,210 Asset-backed securities 410 - 464 days 8,035 — Total long-term investments $ 144,159 $ 102,385
Schedule of Unrealized Loss on Investments	The following table summarizes the cost and fair value of the Company's investments at December 31, 2016 (in thousands): Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. agency notes $ 154,272 $ 12 $ (261 ) $ 154,023 Commercial paper 1,993 — — 1,993 Corporate bonds 109,133 10 (120 ) 109,023 Asset-backed securities 15,545 4 (1 ) 15,548 Total investments $ 280,943 $ 26 $ (382 ) $ 280,587 The following table summarizes the cost and fair value of the Company's investments at December 31, 2015 (in thousands): Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. agency notes $ 83,977 $ — $ (334 ) $ 83,643 Corporate bonds 91,537 2 (266 ) 91,273 Total investments $ 175,514 $ 2 $ (600 ) $ 174,916
Summary of Carrying and Fair Value of Company's Financial Assets	The following table summarizes the carrying and fair value of the Company’s financial assets (in thousands): December 31, 2016 December 31, 2015 Carrying Value Fair Value Carrying Value Fair Value Assets Cash equivalents* $ 44,962 $ 44,962 $ 123,170 $ 123,170 Short and long-term investments 280,587 280,587 174,916 174,916 Total assets $ 325,549 $ 325,549 $ 298,086 $ 298,086 * Excludes $38.0 million and $52.7 million of operating cash balances as of December 31, 2016 and 2015 , respectively.
Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis	The following table summarizes the values (in thousands): December 31, Level 1 Level 2 Level 3 Money market funds $ 44,962 $ 44,962 $ — $ — Total cash equivalents* 44,962 44,962 — — U.S. agency notes 154,024 — 154,024 — Commercial paper 1,993 — 1,993 — Corporate bonds 109,022 — 109,022 — Asset-backed securities 15,548 — 15,548 — Total investments 280,587 — 280,587 — Total cash equivalents and investments $ 325,549 $ 44,962 $ 280,587 $ — December 31, Level 1 Level 2 Level 3 Money market funds $ 123,170 $ 123,170 $ — $ — Total cash equivalents* 123,170 123,170 — — U.S. agency notes 83,643 — 83,643 — Corporate bonds 91,273 — 91,273 — Total investments 174,916 — 174,916 — Total cash equivalents and investments $ 298,086 $ 123,170 $ 174,916 $ — * Excludes $38.0 million and $52.7 million of operating cash balances as of December 31, 2016 and 2015 , respectively.
Customers Represented Percentage of Revenue or Accounts Receivable	The following customers represented 10% or more of revenue for the periods presented: Year Ended December 31, 2016 2015 2014 Revenue Company A * * 13 % Company B 10 % * * * Represented less than 10%
Estimated Useful Lives of Related Assets	Depreciation is calculated using the straight-line method over the estimated useful lives of the related assets per the table below: Equipment 3 - 5 years Software 1.5 - 3 years Furniture and fixtures 5 years
Estimated Useful Lives Used in Computing Amortization	The estimated useful lives used in computing amortization are as follows: Customer relationships 3 - 8 years Developed technology 2 - 6 years Trade names 1 - 7 years
Deferred Revenue	Deferred revenue consists of the following (in thousands): December 31, December 31, License software $ 17,662 $ 33,200 Subscription and maintenance support 72,559 61,399 Professional services and other 18,968 16,455 Total $ 109,189 $ 111,054 Current portion $ 97,037 $ 106,483 Non-current portion 12,152 4,571 Total $ 109,189 $ 111,054
Fair Value of Stock Options Estimated at Weighted Average Assumptions	Fair value of the stock options was estimated at the grant date, using the following weighted average assumptions: Year ended December 31, 2016 2015 2014 Average assumptions: Risk-free interest rate 1.3 % 1.5 % 1.7 % Expected dividend yield — % — % — % Expected volatility 47 % 52 % 53 % Expected term (years) 5.6 years 6.9 years 7.6 years
Net (Loss) Income Per Common Share	The following table presents a reconciliation of the numerator and denominator of the basic and diluted earnings per share computation. In the table below, net income represents the numerator and weighted average common shares outstanding represents the denominator: Year Ended December 31, 2016 2015 2014 (in thousands, except per share data) Net income $ 816 $ 179 $ 296 Weighted average basic common shares outstanding 29,670 29,113 28,654 Dilutive effect of stock-based awards 976 705 711 Dilutive effect of premium feature of the Notes 252 — — Weighted average diluted common shares outstanding 30,898 29,818 29,365 Earnings per share: Basic $ 0.03 $ 0.01 $ 0.01 Diluted $ 0.03 $ 0.01 $ 0.01

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2016
Business Combinations [Abstract]
Summary of Fair Value of Assets Acquired and Liabilities Assumed at the Acquisition Date	The following table summarizes the fair value of the assets acquired and liabilities assumed at the acquisition date of October 28, 2016 (in thousands): Cash and cash equivalents $ 69 Accounts receivable 388 Prepaid and other assets 21 Property and equipment 182 Trade name 100 Customer relationships 7,900 Goodwill 5,065 Accounts payable and accrued expenses (375 ) Total consideration $ 13,350 The following table summarizes the fair value of the assets acquired and liabilities assumed at the acquisition date of June 3, 2015 (in thousands): Cash and cash equivalents $ 2,748 Accounts receivable 1,920 Prepaid and other assets 293 Deferred tax assets 2,404 Property and equipment 15 Customer relationships 5,600 Goodwill 2,497 Accounts payable and accrued expenses (677 ) Total consideration $ 14,800 The following table summarizes the fair value of the assets acquired and liabilities assumed at the acquisition date of February 4, 2016 (in thousands): Cash and cash equivalents $ 365 Accounts receivable 1,623 Prepaid and other assets 285 Property and equipment 155 Deferred tax assets 3,496 Trade name 160 Customer relationships 4,100 Developed technology 3,050 Goodwill 7,825 Deferred revenue (111 ) Accounts payable and accrued expenses (1,148 ) Total consideration $ 19,800
Unaudited Pro-forma Statements of Operations	The unaudited pro forma statements of operations data below gives effect to the acquisitions as if they had occurred as of the beginning of the year prior to the acquisition. The following data includes adjustments for amortization of intangibles and acquisition costs. The pro forma information as presented below is for informational purposes only and is not necessarily indicative of the results of operations that would have been achieved if the acquisitions had been in effect for the periods presented. Year Ended December 31, 2016 2015 2014 (In thousands except per share data) Revenue $ 346,844 $ 298,974 $ 233,576 Net (loss) income 1,103 (1,785 ) (1,311 ) Net (loss) income per common share, basic $ 0.04 $ (0.06 ) $ (0.05 ) Net (loss) income per common share, diluted $ 0.04 $ (0.06 ) $ (0.05 )

Goodwill and Intangibles (Table

Goodwill and Intangibles (Tables)	12 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Changes in Carrying Amounts of Goodwill	The following table provides a summary of the changes in the carrying amounts of goodwill (in thousands): Balance, December 31, 2014 $ 65,303 Increase in goodwill related to acquisitions 9,123 Other (2,151 ) Balance, December 31, 2015 72,275 Increase in goodwill related to acquisitions 13,638 Other (3,155 ) Balance, December 31, 2016 $ 82,758
Schedule of Company's Acquired Intangible Assets Subject to Amortization	The Company’s acquired intangible assets are subject to amortization. The following is a summary of intangible assets (in thousands): December 31, 2016 December 31, 2015 Gross Carrying Amount Accumulated Amortization Net Amount Gross Carrying Amount Accumulated Amortization Net Amount Customer relationships $ 28,252 $ 6,259 $ 21,993 $ 17,571 $ 3,721 $ 13,850 Developed technology 12,952 7,446 5,506 13,277 8,489 4,788 Trade name 550 210 340 298 101 197 Total $ 41,754 $ 13,915 $ 27,839 $ 31,146 $ 12,311 $ 18,835
Schedule of Future Expected Amortization Expense on Intangible Assets	As of December 31, 2016 , future amortization expense on intangible assets is expected to be as follows (in thousands): 2017 $ 6,429 2018 5,105 2019 4,729 2020 4,140 2021 2,883 2022 and thereafter 4,553 Total amortization expense $ 27,839

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment at Cost	Property and equipment consists of the following (in thousands): December 31, 2016 2015 Equipment $ 31,999 $ 26,767 Software 16,887 11,460 Furniture and fixtures 2,133 1,645 Leasehold improvements 6,580 5,605 57,599 45,477 Less accumulated depreciation and amortization (34,973 ) (25,996 ) Property and equipment, net $ 22,626 $ 19,481

Accounts Payable and Other Cu29

Accounts Payable and Other Current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2016
Accounts Payable and Accrued Liabilities, Current [Abstract]
Schedule of Accounts Payable and Other Current Liabilities	Accounts payable and other current liabilities consist of the following (in thousands): December 31, 2016 2015 Accounts payable and accrued expenses $ 14,676 $ 12,102 Accrued compensation 15,021 11,670 Other 4,157 4,895 $ 33,854 $ 28,667

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Components of Income Before Income Taxes and Provision for (Benefit From) Income Taxes	The following table presents the components of the income before income taxes and the provision for (benefit from) income taxes (in thousands): Year ended December 31, 2016 2015 2014 Income (loss) before income taxes: United States $ 4,260 $ (1,488 ) $ (4,769 ) Foreign (1,984 ) 1,631 2,866 Income (loss) before income taxes $ 2,276 $ 143 $ (1,903 ) Provision for (benefit from) income taxes: Current: Federal and state $ 848 $ 965 $ 4,718 Foreign 2,571 3,244 1,726 Total current $ 3,419 $ 4,209 $ 6,444 Deferred: Federal and state $ (2,354 ) $ (4,018 ) $ (5,360 ) Foreign 395 (227 ) (3,283 ) Total deferred $ (1,959 ) $ (4,245 ) $ (8,643 ) Provision for (benefit from) income taxes $ 1,460 $ (36 ) $ (2,199 )
Components of Net Deferred Tax Assets (Liabilities) and Related Valuation Allowance	The following table presents the components of net deferred tax assets (liabilities) and the related valuation allowance (in thousands): December 31, 2016 2015 Deferred tax assets: Net operating loss carry-forward $ 2,795 $ 2,509 Deferred revenue 8,718 8,296 Depreciation and amortization 1,581 1,428 Research tax credit carry-forward 4,961 2,869 Accrued expenses 1,565 2,927 Stock-based compensation 10,094 8,181 Other 10,136 7,726 Total deferred tax assets $ 39,850 $ 33,936 Valuation allowance (1,813 ) (312 ) Net deferred tax assets $ 38,037 $ 33,624 Deferred tax liabilities: Acquired intangibles $ (7,734 ) $ (6,181 ) Convertible debt discount (23,978 ) (28,213 ) Other (177 ) (537 ) Total deferred tax liabilities $ (31,889 ) $ (34,931 ) Net deferred tax assets $ 6,148 $ (1,307 )
Provisions for Income Taxes Compared with Income Taxes Based on Federal Statutory Tax Rate	The following table presents the provisions for income taxes compared with income taxes based on the federal statutory tax rate of 35% (in thousands): Year ended December 31, 2016 2015 2014 Tax provision (benefit) based on federal statutory rate $ 800 $ 50 $ (666 ) State taxes 411 490 430 Impact of foreign operations 180 201 (508 ) Other permanent items 414 144 193 IRC 162(m) add back 699 222 456 Stock-based compensation 1,202 1,096 1,002 Change in income tax valuation allowance 1,506 16 (2,804 ) Business tax credits (4,357 ) (2,302 ) (2,314 ) Finland intellectual property transfer (387 ) (324 ) (81 ) Meals and entertainment 464 432 198 Acquisition costs 163 248 128 Change in tax rates 365 (309 ) 1,767 Provision for (benefit from) income taxes $ 1,460 $ (36 ) $ (2,199 )
Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands): Year ended December 31, 2016 2015 2014 Unrecognized tax benefits balance at January 1, $ 4,927 $ 4,619 $ 4,875 Additions for tax positions of prior years 1,395 413 243 Additions for tax provisions of current year 2,449 453 — Settlements of tax positions of prior years (146 ) (558 ) (499 ) Unrecognized tax benefits balance at December 31, $ 8,625 $ 4,927 $ 4,619 The amount of the unrecognized tax benefit if realized that would impact the rate is $6.8 million , $4.9 million and $4.6 million for years ended December 31, 2016, 2015 and 2014 respectively.

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Summary of Company's Financial Statements	The following table shows the amounts recorded within the Company’s financial statements with respect to the combined 2022 Notes and 2018 Notes (collectively, the "Notes") (in thousands): December 31, December 31, Convertible debt principal $ 270,355 $ 270,355 Unamortized debt discount (65,590 ) (77,440 ) Unamortized debt issuance costs (3,750 ) (4,584 ) Net carrying amount of convertible debt $ 201,015 $ 188,331
Summary of Interest Expense Recognized	The following table presents the interest expense recognized related to the Notes (in thousands): Year ended December 31, 2016 2015 2014 Contractual interest expense $ 3,049 $ 2,039 $ 1,800 Amortization of debt issuance costs 834 1,022 406 Accretion of debt discount 11,847 7,595 5,500 Interest expense $ 15,730 $ 10,656 $ 7,706
Aggregate Maturities of Borrowings	The aggregate maturities of borrowings as of December 31, 2016 were as follows (in thousands): 2017 $ — 2018 69,105 2019-2020 — 2021 and thereafter 201,250 $ 270,355

Stock-based Compensation (Table

Stock-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Stock-based Compensation Expense Recognized by Company	Stock-based compensation expense recognized by the Company is as follows (in thousands): Year ended December 31, 2016 2015 2014 Stock options $ 8,156 $ 7,572 $ 6,814 Restricted stock units 41,727 31,719 19,585 Performance stock units 1,624 1,153 3,874 Total recognized stock-based compensation expense $ 51,507 $ 40,444 $ 30,273
Summary of Information Related to Stock Options	The following table presents a summary related to stock options for the year ended December 31, 2016 : Number of Options Outstanding Weighted Average Exercise Price Weighted Average Remaining Contractual Term (years) Aggregate Intrinsic Value (in thousands) Balance, December 31, 2015 1,999,875 $ 29.48 Granted 617,950 37.62 Exercised (474,409 ) 32.00 Forfeited (148,697 ) 32.65 Expired (10,436 ) 32.79 Balance, December 31, 2016 1,984,283 $ 31.15 7.26 $ 20,798 Vested and exercisable at December 31, 2016 975,131 $ 27.67 5.69 $ 13,243
Summary of Activity for Restricted Stock Units	The following table presents a summary of activity for RSUs (excluding RSUs that are subject to performance-based vesting conditions): Number of RSUs Weighted Average Grant Date Fair Value Balance, December 31, 2015 1,512,022 $ 33.20 Granted 1,567,621 38.27 Vested (1,112,838 ) 34.47 Forfeited (107,394 ) 34.71 Balance, December 31, 2016 1,859,411 $ 36.63
Schedule Of Share Based Compensation Performance Stock Units Award Activity	The following table presents a summary of activity for PSUs: Number of PSUs Weighted Average Grant Date Fair Value Balance, December 31, 2015 550,088 $ 26.87 Granted 5,000 45.90 Vested (116,506 ) 30.13 Forfeited (33,798 ) 23.72 Balance, December 31, 2016 404,784 $ 26.44

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Summary of Future Minimum Lease Payments Under Non-cancelable Operating Leases	The following table presents future minimum lease payments under the non-cancelable operating leases (in thousands): Operating Leases Years Ending December 31: 2017 $ 5,807 2018 5,024 2019 3,171 2020 2,132 2021 and thereafter 5,429 Total future minimum lease payments $ 21,563

Segment and Geographic Inform34

Segment and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2016
Segment Reporting [Abstract]
Schedule of Revenue by Geographic Area	The following table presents revenue and long-lived assets, net, by geographic area (in thousands): Year Ended December 31, 2016 2015 2014 Revenue: North America $ 192,824 $ 180,791 $ 112,198 EMEA 98,138 61,187 54,950 Emerging Markets 50,000 36,865 49,709 Total revenue $ 340,962 $ 278,843 $ 216,857 North America includes $ 177.5 million , $172.0 million and $106.8 million of United States revenue for the years ended December 31, 2016 , 2015 and 2014 . December 31, December 31, Long-Lived Assets, net North America $ 22,909 $ 21,135 EMEA 4,683 5,008 Emerging Markets 2,932 1,171 Total long-lived assets, net $ 30,524 $ 27,314 North America includes $22.6 million and $20.9 million of United States long-lived assets as of December 31, 2016 and 2015 .

Quarterly Financial Data (Una35

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Consolidated Results of Operations by Quarter	Quarterly Financial Data (Unaudited) (in thousands, except per share data): March 31, 2016 June 30, 2016 September 30, 2016 December 31, 2016 Total revenue $ 73,136 $ 81,721 $ 84,122 $ 101,983 Gross profit 52,338 59,175 60,369 77,903 Income (loss) from operations (419 ) 553 1,567 13,806 Net income (loss) (1,509 ) (2,895 ) (605 ) 5,826 Net income (loss) per share: Basic $ (0.05 ) $ (0.10 ) $ (0.02 ) $ 0.19 Diluted $ (0.05 ) $ (0.10 ) $ (0.02 ) $ 0.18 March 31, June 30, September 30, December 31, Total revenue $ 55,671 $ 64,484 $ 69,097 $ 89,591 Gross profit 39,661 44,249 47,451 69,724 Income (loss) from operations (1,275 ) (4,928 ) 822 20,624 Net income (loss) (2,905 ) (5,288 ) (3,250 ) 11,622 Net income (loss) per share: Basic $ (0.10 ) $ (0.18 ) $ (0.11 ) $ 0.40 Diluted $ (0.10 ) $ (0.18 ) $ (0.11 ) $ 0.39

Summary of Significant Accoun36

Summary of Significant Accounting Policies - Contracted Maturity and Carrying Value of Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Investments In Marketable Securities [Line Items]
Total cash equivalents, carrying value	$ 82,993	$ 175,857	$ 101,543	$ 69,866
Total short term investments, carrying value	136,428	72,531
Total long term investments, carrying value	$ 144,159	$ 102,385
Money market funds
Schedule Of Investments In Marketable Securities [Line Items]
Contracted maturity of cash equivalents	demand	demand
Total cash equivalents, carrying value	$ 44,962	$ 123,170
U.S. agency notes
Schedule Of Investments In Marketable Securities [Line Items]
Total short term investments, carrying value	60,103	39,467
Total long term investments, carrying value	$ 93,922	$ 44,175
U.S. agency notes | Minimum
Schedule Of Investments In Marketable Securities [Line Items]
Contracted maturity of short term investments	120 days	50 days
Contracted maturity of long term investments	380 days	486 days
U.S. agency notes | Maximum
Schedule Of Investments In Marketable Securities [Line Items]
Contracted maturity of short term investments	156 days	365 days
Contracted maturity of long term investments	516 days	851 days
Commercial paper
Schedule Of Investments In Marketable Securities [Line Items]
Contracted maturity of short term investments	137 days
Total short term investments, carrying value	$ 1,993	$ 0
Corporate bonds
Schedule Of Investments In Marketable Securities [Line Items]
Total short term investments, carrying value	66,820	33,064
Total long term investments, carrying value	$ 42,202	$ 58,210
Corporate bonds | Minimum
Schedule Of Investments In Marketable Securities [Line Items]
Contracted maturity of short term investments	10 days	12 days
Contracted maturity of long term investments	381 days	376 days
Corporate bonds | Maximum
Schedule Of Investments In Marketable Securities [Line Items]
Contracted maturity of short term investments	363 days	319 days
Contracted maturity of long term investments	488 days	846 days
Asset-backed securities
Schedule Of Investments In Marketable Securities [Line Items]
Total short term investments, carrying value	$ 7,512	$ 0
Total long term investments, carrying value	$ 8,035	$ 0
Asset-backed securities | Minimum
Schedule Of Investments In Marketable Securities [Line Items]
Contracted maturity of short term investments	107 days
Contracted maturity of long term investments	410 days
Asset-backed securities | Maximum
Schedule Of Investments In Marketable Securities [Line Items]
Contracted maturity of short term investments	258 days
Contracted maturity of long term investments	464 days

Summary of Significant Accoun37

Summary of Significant Accounting Policies - Cost, Unrealized Gains (Losses) and Fair Value of Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Marketable Securities [Line Items]
Cost	$ 280,943	$ 175,514
Gross Unrealized Gains	26	2
Gross Unrealized Losses	(382)	(600)
Fair Value	280,587	174,916
U.S. agency notes
Schedule Of Investments In Marketable Securities [Line Items]
Cost	154,272	83,977
Gross Unrealized Gains	12	0
Gross Unrealized Losses	(261)	(334)
Fair Value	154,023	83,643
Commercial paper
Schedule Of Investments In Marketable Securities [Line Items]
Cost	1,993
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	1,993
Corporate bonds
Schedule Of Investments In Marketable Securities [Line Items]
Cost	109,133	91,537
Gross Unrealized Gains	10	2
Gross Unrealized Losses	(120)	(266)
Fair Value	109,023	$ 91,273
Asset-backed securities
Schedule Of Investments In Marketable Securities [Line Items]
Cost	15,545
Gross Unrealized Gains	4
Gross Unrealized Losses	(1)
Fair Value	$ 15,548

Summary of Significant Accoun38

Summary of Significant Accounting Policies - Carrying and Fair Value of Company's Financial Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Cash equivalents and certificates of deposit, Carrying Value	$ 44,962	$ 123,170
Short and long-term investments, Carrying Value	280,587	174,916
Total assets, Carrying Value	325,549	298,086
Cash equivalents and certificates of deposit, Fair Value	44,962	123,170
Short and long-term investments, Fair Value	280,587	174,916
Total cash equivalents and investments	325,549	298,086
Cash equivalents and certificates of deposit not included in operating cash	$ 38,000	$ 52,700

Summary of Significant Accoun39

Summary of Significant Accounting Policies - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and certificates of deposit	$ 44,962,000	$ 123,170,000
Total investments	280,587,000	174,916,000
Total cash equivalents and investments	325,549,000	298,086,000
Cash equivalents and certificates of deposit not included in operating cash	38,000,000	52,700,000
Assets, fair value, nonrecurring basis subsequent to initial recognition	0	0	$ 0
Liabilities, fair value, nonrecurring basis subsequent to initial recognition	0	0	$ 0
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and certificates of deposit	44,962,000	123,170,000
Total investments	280,587,000	174,916,000
Total cash equivalents and investments	325,549,000	298,086,000
Fair Value, Measurements, Recurring | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and certificates of deposit	44,962,000	123,170,000
Fair Value, Measurements, Recurring | U.S. agency notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	154,024,000	83,643,000
Fair Value, Measurements, Recurring | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	1,993,000
Fair Value, Measurements, Recurring | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	109,022,000	91,273,000
Fair Value, Measurements, Recurring | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	15,548,000
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and certificates of deposit	44,962,000	123,170,000
Total investments	0	0
Total cash equivalents and investments	44,962,000	123,170,000
Fair Value, Measurements, Recurring | Level 1 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and certificates of deposit	44,962,000	123,170,000
Fair Value, Measurements, Recurring | Level 1 | U.S. agency notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	0	0
Fair Value, Measurements, Recurring | Level 1 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	0
Fair Value, Measurements, Recurring | Level 1 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	0	0
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	0
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and certificates of deposit	0	0
Total investments	280,587,000	174,916,000
Total cash equivalents and investments	280,587,000	174,916,000
Fair Value, Measurements, Recurring | Level 2 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and certificates of deposit	0	0
Fair Value, Measurements, Recurring | Level 2 | U.S. agency notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	154,024,000	83,643,000
Fair Value, Measurements, Recurring | Level 2 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	1,993,000
Fair Value, Measurements, Recurring | Level 2 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	109,022,000	91,273,000
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	15,548,000
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and certificates of deposit	0	0
Total investments	0	0
Total cash equivalents and investments	0	0
Fair Value, Measurements, Recurring | Level 3 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and certificates of deposit	0	0
Fair Value, Measurements, Recurring | Level 3 | U.S. agency notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	0	0
Fair Value, Measurements, Recurring | Level 3 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	0
Fair Value, Measurements, Recurring | Level 3 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	0	$ 0
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	$ 0

Summary of Significant Accoun40

Summary of Significant Accounting Policies - Concentration of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2014
Concentration Risk [Line Items]
Accounts Receivable (as a percent)	10.00%
Company A
Concentration Risk [Line Items]
Revenue (as a percent)		13.00%
Company B
Concentration Risk [Line Items]
Revenue (as a percent)	10.00%

Summary of Significant Accoun41

Summary of Significant Accounting Policies - Estimated Useful Lives of Related Assets (Details)	12 Months Ended
	Dec. 31, 2016
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of related assets (in years)	3 years
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of related assets (in years)	5 years
Software | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of related assets (in years)	1 year 6 months
Software | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of related assets (in years)	3 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated useful lives of related assets (in years)	5 years

Summary of Significant Accoun42

Summary of Significant Accounting Policies - Estimated Useful Lives Used in Computing Amortization (Details)	12 Months Ended
	Dec. 31, 2016
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives used in computing amortization (in years)	3 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives used in computing amortization (in years)	8 years
Developed technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives used in computing amortization (in years)	2 years
Developed technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives used in computing amortization (in years)	6 years
Trade names | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives used in computing amortization (in years)	1 year
Trade names | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives used in computing amortization (in years)	7 years

Summary of Significant Accoun43

Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2016USD ($)reporting_unitshares	Dec. 31, 2015USD ($)shares	Dec. 31, 2014USD ($)shares
Accounting Policies [Abstract]
Number of reporting units | reporting_unit	1
Impairment of long-lived assets	$ 0	$ 0	$ 0
Warranty period for Company's licensed software (in days)	90 days
Capitalized in internal-use software	$ 3,500,000	2,200,000
Amortization of software development cost	$ 1,900,000	1,500,000	$ 700,000
Recognition period for current portion of deferred revenue no more than twelve months (in months)	12 months
Deferred tax asset valuation allowance	$ 1,813,000	$ 312,000
Weighted average effect of potentially dilutive securities excluded contribution (in shares) | shares	730,704	1,203,399	1,369,462

Summary of Significant Accoun44

Summary of Significant Accounting Policies - Deferred Revenue (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 109,189	$ 111,054
Deferred revenue, current portion	97,037	106,483
Deferred revenue, Non-current portion	12,152	4,571
License software
Deferred Revenue Arrangement [Line Items]
Deferred revenue	17,662	33,200
Subscription and maintenance support
Deferred Revenue Arrangement [Line Items]
Deferred revenue	72,559	61,399
Professional services and other
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 18,968	$ 16,455

Summary of Significant Accoun45

Summary of Significant Accounting Policies - Fair Value of Stock Options Estimated at Weighted Average Assumptions (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Average assumptions:
Risk-free interest rate (as a percent)	1.30%	1.50%	1.70%
Expected dividend yield (as a percent)	0.00%	0.00%	0.00%
Expected volatility (as a percent)	47.00%	52.00%	53.00%
Expected term (years)	5 years 7 months 6 days	6 years 10 months 24 days	7 years 7 months 6 days

Summary of Significant Accoun46

Summary of Significant Accounting Policies - Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Net income									$ 816	$ 179	$ 296
Weighted average basic common shares outstanding (in shares)									29,670	29,113	28,654
Dilutive effect of stock-based awards (in shares)									976	705	711
Dilutive effect of premium feature of the Notes (in shares)									252	0	0
Weighted average diluted common shares outstanding (in shares)									30,898	29,818	29,365
Earnings per share:
Basic (in dollars per share)	$ 0.19	$ (0.02)	$ (0.10)	$ (0.05)	$ 0.40	$ (0.11)	$ (0.18)	$ (0.10)	$ 0.03	$ 0.01	$ 0.01
Diluted (in dollars per share)	$ 0.18	$ (0.02)	$ (0.10)	$ (0.05)	$ 0.39	$ (0.11)	$ (0.18)	$ (0.10)	$ 0.03	$ 0.01	$ 0.01

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details) - USD ($) $ in Thousands	Oct. 28, 2016	Feb. 04, 2016	Jun. 03, 2015	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Increase in goodwill related to acquisitions				$ 13,638	$ 9,123
Goodwill				82,758	72,275
VoIP Logic
Business Acquisition [Line Items]
Consideration paid	$ 13,400
Business acquisition, transaction costs	500
Customer relationships	7,900
Increase in goodwill related to acquisitions				5,100	3,300
Goodwill	$ 5,065
Goodwill associated with acquisition, amortization period for tax purposes	15 years
VoIP Logic | Trade names
Business Acquisition [Line Items]
Amortization period of customer relationship intangibles (in years)	3 years
VoIP Logic | Customer relationships
Business Acquisition [Line Items]
Amortization period of customer relationship intangibles (in years)	8 years
Transera
Business Acquisition [Line Items]
Consideration paid		$ 19,800
Business acquisition, transaction costs		500
Customer relationships		$ 4,100
Increase in goodwill related to acquisitions				$ 7,800
Weighted-average amortization period for amortizable intangible assets (in years)		6 years
Goodwill		$ 7,825
Transera | Trade names
Business Acquisition [Line Items]
Amortization period of customer relationship intangibles (in years)		3 years
Transera | Customer relationships
Business Acquisition [Line Items]
Amortization period of customer relationship intangibles (in years)		7 years
Transera | Developed technology
Business Acquisition [Line Items]
Amortization period of customer relationship intangibles (in years)		5 years
mPortal, Inc.
Business Acquisition [Line Items]
Consideration paid			$ 14,800
Business acquisition, transaction costs			700
Customer relationships			5,600
Increase in goodwill related to acquisitions					$ 2,500
Goodwill			2,497
Cash on hand to fund acquisition			14,300
Restricted stock issued to fund acquisition			$ 500
mPortal, Inc. | Customer relationships
Business Acquisition [Line Items]
Amortization period of customer relationship intangibles (in years)			8 years

Acquisitions - Estimated Fair V

Acquisitions - Estimated Fair Value of Assets Acquired and Liabilities Assumed-VoIP logic (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Oct. 28, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 82,758		$ 72,275
VoIP Logic
Business Acquisition [Line Items]
Cash and cash equivalents		$ 69
Accounts receivable		388
Prepaid and other assets		21
Deferred tax assets		182
Trade name		100
Customer relationships		7,900
Goodwill		5,065
Accounts payable and accrued expenses		(375)
Total consideration		$ 13,350

Acquisitions - Estimated Fair49

Acquisitions - Estimated Fair Value of Assets Acquired and Liabilities Assumed-Transera Communications, Inc (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Feb. 04, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 82,758		$ 72,275
Transera
Business Acquisition [Line Items]
Cash and cash equivalents		$ 365
Accounts receivable		1,623
Prepaid and other assets		285
Property and equipment		155
Deferred tax assets		3,496
Trade name		160
Customer relationships		4,100
Developed technology		3,050
Goodwill		7,825
Deferred revenue		(111)
Accounts payable and accrued expenses		(1,148)
Total consideration		$ 19,800

Acquisitions - Estimated Fair50

Acquisitions - Estimated Fair Value of Assets Acquired and Liabilities Assumed-mPortal, Inc. (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Jun. 03, 2015
Business Acquisition [Line Items]
Goodwill	$ 82,758	$ 72,275
mPortal, Inc.
Business Acquisition [Line Items]
Cash and cash equivalents			$ 2,748
Accounts receivable			1,920
Prepaid expenses and other assets			293
Deferred tax asset			2,404
Property and equipment			15
Customer relationships			5,600
Goodwill			2,497
Accounts payable and accrued expenses			(677)
Total consideration			$ 14,800

Acquisitions - Pro-forma Financ

Acquisitions - Pro-forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Combinations [Abstract]
Contributed aggregate revenue from business acquisitions	$ 8,800	$ 7,600
Contributed aggregate losses from business acquisitions	5,000	800
Revenue	346,844	298,974	$ 233,576
Net (loss) income	$ 1,103	$ (1,785)	$ (1,311)
Net (loss) income per common share, basic (in dollars per share)	$ 0.04	$ (0.06)	$ (0.05)
Net (loss) income per common share, diluted (in dollars per share)	$ 0.04	$ (0.06)	$ (0.05)

Goodwill and Intangibles - Addi

Goodwill and Intangibles - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite Lived Intangible Assets Amortization [Line Items]
Goodwill impairment	$ 0	$ 0
Increase in goodwill related to acquisitions	13,638,000	9,123,000
Amortization expense on intangible assets	6,600,000	5,800,000	$ 5,400,000
Gross carrying amount of intangible assets retired	4,500,000	5,900,000	$ 1,300,000
VoIP Logic
Finite Lived Intangible Assets Amortization [Line Items]
Increase in goodwill related to acquisitions	5,100,000	3,300,000
Transera
Finite Lived Intangible Assets Amortization [Line Items]
Increase in goodwill related to acquisitions	7,800,000
Enterprise Messaging-based Collaboration Software
Finite Lived Intangible Assets Amortization [Line Items]
Increase in goodwill related to acquisitions	900,000
mPortal, Inc.
Finite Lived Intangible Assets Amortization [Line Items]
Increase in goodwill related to acquisitions		2,500,000
Cloud-based Communication Company | Japan
Finite Lived Intangible Assets Amortization [Line Items]
Increase in goodwill related to acquisitions		$ 3,300,000
Goodwill measurement period adjustment	$ (200,000)

Goodwill and Intangibles - Summ

Goodwill and Intangibles - Summary of Changes in Carrying Amounts of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Goodwill, gross, balance at beginning of period	$ 72,275	$ 65,303
Increase in goodwill related to acquisitions	13,638	9,123
Other	(3,155)	(2,151)
Goodwill, gross, balance at end of period	$ 82,758	$ 72,275

Goodwill and Intangibles - Sche

Goodwill and Intangibles - Schedule of Company's Acquired Intangible Assets Subject to Amortization (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 41,754	$ 31,146
Accumulated Amortization	13,915	12,311
Net Amount	27,839	18,835
Customer relationships
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	28,252	17,571
Accumulated Amortization	6,259	3,721
Net Amount	21,993	13,850
Developed technology
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	12,952	13,277
Accumulated Amortization	7,446	8,489
Net Amount	5,506	4,788
Trade names
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	550	298
Accumulated Amortization	210	101
Net Amount	$ 340	$ 197

Goodwill and Intangibles - Sc55

Goodwill and Intangibles - Schedule of Future Expected Amortization Expense on Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
2,017	$ 6,429
2,018	5,105
2,019	4,729
2,020	4,140
2,021	2,883
2022 and thereafter	4,553
Net Amount	$ 27,839	$ 18,835

Property and Equipment (Detail)

Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment gross	$ 57,599	$ 45,477
Less accumulated depreciation and amortization	(34,973)	(25,996)
Property and equipment, net	22,626	19,481
Depreciation and amortization expense	11,400	9,800	$ 7,000
Equipment
Property, Plant and Equipment [Line Items]
Property and equipment gross	31,999	26,767
Software
Property, Plant and Equipment [Line Items]
Property and equipment gross	16,887	11,460
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment gross	2,133	1,645
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment gross	$ 6,580	$ 5,605

Accounts Payable and Other Cu57

Accounts Payable and Other Current Liabilities - Schedule of Accounts Payable and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts Payable and Accrued Liabilities, Current [Abstract]
Accounts payable and accrued expenses	$ 14,676	$ 12,102
Accrued compensation	15,021	11,670
Other	4,157	4,895
Total accounts payable and other current liabilities	$ 33,854	$ 28,667

Software Licenses (Details)

Software Licenses (Details) - USD ($) $ in Millions	12 Months Ended			48 Months Ended	55 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	May 31, 2016	Dec. 20, 2020	Jun. 30, 2016
Deferred Revenue Arrangement [Line Items]
Amount distributed for licenses				$ 10.2
Amortized cost of revenue period (in years)				4 years
Additional cost for amortized cost of revenue						$ 17.3
Amortization expense related to agreement	$ 3.3	$ 2.6	$ 2.6
Scenario, Forecast
Deferred Revenue Arrangement [Line Items]
Extent annual billed license revenue					$ 850

Income Taxes - Components of In

Income Taxes - Components of Income Before Income Taxes and Provision for (Benefit From) Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income (loss) before income taxes:
United States	$ 4,260	$ (1,488)	$ (4,769)
Foreign	(1,984)	1,631	2,866
Income (loss) before income taxes	2,276	143	(1,903)
Current:
Federal and state	848	965	4,718
Foreign	2,571	3,244	1,726
Total current	3,419	4,209	6,444
Deferred:
Federal and state	(2,354)	(4,018)	(5,360)
Foreign	395	(227)	(3,283)
Total deferred	(1,959)	(4,245)	(8,643)
Provision for (benefit from) income taxes	$ 1,460	$ (36)	$ (2,199)

Income Taxes - Components of Ne

Income Taxes - Components of Net Deferred Tax Assets (Liabilities) and Related Valuation Allowance (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Net operating loss carry-forward	$ 2,795	$ 2,509
Deferred revenue	8,718	8,296
Depreciation and amortization	1,581	1,428
Research tax credit carry-forward	4,961	2,869
Accrued expenses	1,565	2,927
Stock-based compensation	10,094	8,181
Other	10,136	7,726
Total deferred tax assets	39,850	33,936
Valuation allowance	(1,813)	(312)
Net deferred tax assets	38,037	33,624
Deferred tax liabilities:
Acquired intangibles	(7,734)	(6,181)
Convertible debt discount	(23,978)	(28,213)
Other	(177)	(537)
Total deferred tax liabilities	(31,889)	(34,931)
Net deferred tax assets	$ 6,148
Net deferred tax liabilities		$ (1,307)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Tax Credit Carryforward [Line Items]
Tax credit carryforward	$ 16.5	$ 11.1
Effects tax benefits not included in deferred tax assets	19.6	$ 17.9
Deferred tax liability for undistributed earnings	$ 10.2
Federal statutory tax rate (as a percent)	35.00%	35.00%	35.00%
Threshold amount to separately disclose tax effect of items	$ 0.3
Unrecognized tax benefits that would impact effective tax rate	6.8	$ 4.9	$ 4.6
Recorded interest and penalties	0.4	0.1
Domestic Tax Authority
Tax Credit Carryforward [Line Items]
U.S. net operating loss carryforwards	34.4	$ 35.9
Tax effect, deferred tax assets, operating loss carryforward	12.8
Foreign Tax Authority
Tax Credit Carryforward [Line Items]
Net operating losses valuation allowance	1.8
Foreign Tax Authority | General Business Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Deferred tax assets, net, noncurrent	$ 4.2

Income Taxes - Provisions for I

Income Taxes - Provisions for Income Taxes Compared with Income Taxes Based on Federal Statutory Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Tax provision (benefit) based on federal statutory rate	$ 800	$ 50	$ (666)
State taxes	411	490	430
Impact of foreign operations	180	201	(508)
Other permanent items	414	144	193
IRC 162(m) add back	699	222	456
Stock-based compensation	1,202	1,096	1,002
Change in income tax valuation allowance	1,506	16	(2,804)
Business tax credits	(4,357)	(2,302)	(2,314)
Finland intellectual property transfer	(387)	(324)	(81)
Meals and entertainment	464	432	198
Acquisition costs	163	248	128
Change in tax rates	365	(309)	1,767
Provision for (benefit from) income taxes	$ 1,460	$ (36)	$ (2,199)

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits balance at January 1,	$ 4,927	$ 4,619	$ 4,875
Additions for tax positions of prior years	1,395	413	243
Additions for tax provisions of current year	2,449	453	0
Settlements of tax positions of prior years	(146)	(558)	(499)
Unrecognized tax benefits balance at December 31,	$ 8,625	$ 4,927	$ 4,619

Borrowings - Additional Informa

Borrowings - Additional Information (Details)	1 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2011USD ($)d$ / shares	Sep. 30, 2015USD ($)d$ / shares	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Debt Instrument [Line Items]
Aggregate principal amount issued			$ 270,355,000	$ 270,355,000
Unamortized offering costs			3,750,000	4,584,000
Proceeds from issuance of 2018 and 2022 convertible senior notes, net of issuance costs			0	194,822,000	$ 0
Senior Notes | 2022 Convertible Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount issued		$ 201,300,000
Coupon rate of notes (as a percent)		1.00%
Debt instrument, principal amount of note		$ 1,000
Initial conversion rate for the Notes (in shares)		25.8249
Principal amount of notes, converted amount		$ 1,000
Conversion price of notes (in dollars per share) | $ / shares		$ 38.72
Debt instrument, redemption price, percentage of principal amount redeemed		100.00%
Debt instrument, valuation rate		7.40%
Initial fair value of the liability component		$ 131,300,000		221,100,000
Amount allocated to the embedded conversion option		70,000,000	59,500,000
Offering costs expense payable		6,400,000
Debt issuance costs		4,200,000
Offering costs allocated to equity component		$ 2,200,000
Unamortized offering costs			3,400,000
Fair value of the Notes			241,500,000
Proceeds from issuance of 2018 and 2022 convertible senior notes, net of issuance costs			194,800,000
Senior Notes | 2022 Convertible Senior Notes | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Number of consecutive or nonconsecutive trading days in condition | d		20
Numbers of consecutive trading days		30 days
Redemption percentage, conversion threshold		130.00%
Senior Notes | 2022 Convertible Senior Notes | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Number of consecutive or nonconsecutive trading days in condition | d		5
Numbers of consecutive trading days		10 days
Redemption percentage, conversion threshold		98.00%
Senior Notes | 2022 Convertible Senior Notes | Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Number of consecutive or nonconsecutive trading days in condition | d		20
Numbers of consecutive trading days		30 days
Redemption percentage, conversion threshold		140.00%
Debt instrument, redemption price, percentage of principal amount redeemed		100.00%
Senior Notes | 2018 Convertible Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount issued	$ 120,000,000
Coupon rate of notes (as a percent)	1.50%
Initial conversion rate for the Notes (in shares)	23.8126
Principal amount of notes, converted amount	$ 1,000
Conversion price of notes (in dollars per share) | $ / shares	$ 41.99
Initial fair value of the liability component	$ 42,400,000
Amount allocated to the embedded conversion option			6,100,000
Offering costs expense payable	4,300,000
Debt issuance costs	2,900,000
Offering costs allocated to equity component	$ 1,400,000
Unamortized offering costs			400,000
Number of business days in conversion condition | d	5
Number of consecutive trading days in condition | d	10
Measurement period adjustment against product (as a percent)	98.00%
Number of trading days in condition	20 or more trading days
Number of consecutive trading days in condition | d	30
Percentage of applicable conversion price	130.00%
Percentage of principal amount of the Notes being repurchased	100.00%
Percentage of applicable conversion price under redemption	140.00%
Number of trading days under redemption	20 or more trading days
Number of consecutive trading days under redemption | d	30
Percentage of interest rate estimated	8.00%
Debt instrument, convertible, initial fair value of liability component	$ 79,400,000
Debt instrument, convertible, initial carrying amount of equity component	40,600,000
Repurchased face amount	50,900,000
Extinguishment of debt, amount	53,400,000
Loss on extinguishment of debt	4,200,000
Debt issuance costs written off	500,000
Debt instrument, convertible, fair value of equity component	$ 6,800,000
Fair value of the Notes			80,200,000	$ 75,300,000
Proceeds from issuance of 2018 and 2022 convertible senior notes, net of issuance costs			$ 115,700,000

Borrowings - Summary of Company

Borrowings - Summary of Company's Financial Statements (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
Convertible debt principal	$ 270,355	$ 270,355
Unamortized debt discount	(65,590)	(77,440)
Unamortized Debt Issuance Expense	(3,750)	(4,584)
Net carrying amount of convertible debt	$ 201,015	$ 188,331

Borrowings - Summary of Interes

Borrowings - Summary of Interest Expense Recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
Contractual interest expense	$ 3,049	$ 2,039	$ 1,800
Amortization of debt issuance costs	834	1,022	406
Accretion of debt discount	11,847	7,595	5,500
Interest expense	$ 15,730	$ 10,656	$ 7,706

Borrowings - Aggregate Maturiti

Borrowings - Aggregate Maturities of Borrowings (Details) $ in Thousands	Dec. 31, 2016USD ($)
Debt Disclosure [Abstract]
2,017	$ 0
2,018	69,105
2019-2020	0
2021 and thereafter	201,250
Total	$ 270,355

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - shares	Dec. 31, 2016	Dec. 31, 2015	Jun. 21, 2010
Stockholders' Equity Note [Abstract]
Authorized number of shares of preferred stock (in shares)	5,000,000	5,000,000	5,000,000

Stock-based Compensation - Addi

Stock-based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of stock based grants (in years)	10 years
APIC pool balance	$ 11.2
Net operating loss carryforward excluded from deferred tax asset calculation	$ 55.5	$ 50.4
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of granted stock options (in dollars per share)	$ 34.47
Unrecognized stock-based compensation expense related to unvested options	$ 53.2
Weighted average period of compensation expense to be recognized (in years)	1 year 10 months 10 days
Restricted stock units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for grants (in years)	3 years
Restricted stock units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for grants (in years)	4 years
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of granted stock options (in dollars per share)	$ 30.13
Unrecognized stock-based compensation expense related to unvested options	$ 0.3
Weighted average period of compensation expense to be recognized (in years)	7 months 21 days
Shares to be received subject to performance conditions	1
Performance stock units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for grants (in years)	3 years
Performance stock units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for grants (in years)	4 years
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of granted stock options (in dollars per share)	$ 16.60	$ 15.75	$ 12.91
Intrinsic value of stock options exercised	$ 4.9	$ 5.2	$ 1.6
Cash received from stock options exercised	15.2	$ 6.2	$ 0.7
Unrecognized stock-based compensation expense related to unvested options	$ 13.2
Weighted average period of compensation expense to be recognized (in years)	1 year 10 months 17 days
Stock-based grants after 2005
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of stock based grants (in years)	5 years
Equity Incentive Plan 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for grants (in years)	4 years
Additional shares of common stock	1,250,000	1,250,000
Shares available for future issuance	708,642
Equity Incentive Plan 2009 | Equity Incentive Plan 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for grants (in years)	3 years

Stock-based Compensation - Summ

Stock-based Compensation - Summary of Stock-based Compensation Expense Recognized by Company (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total recognized stock-based compensation expense	$ 51,507	$ 40,444	$ 30,273
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total recognized stock-based compensation expense	8,156	7,572	6,814
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total recognized stock-based compensation expense	41,727	31,719	19,585
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total recognized stock-based compensation expense	$ 1,624	$ 1,153	$ 3,874

Stock-based Compensation - Su71

Stock-based Compensation - Summary of Information Related to Stock Options (Details) - Stock options $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)$ / sharesshares
Number of Options Outstanding
Beginning Balance (in shares) | shares	1,999,875
Granted (in shares) | shares	617,950
Exercised (in shares) | shares	(474,409)
Forfeited (in shares) | shares	(148,697)
Expired (in shares) | shares	(10,436)
Ending Balance (in shares) | shares	1,984,283
Vested, Ending Balance (in shares) | shares	975,131
Exercisable, Ending Balance (in shares) | shares	975,131
Weighted Average Exercise Price
Beginning Balance (in dollars per share) | $ / shares	$ 29.48
Granted (in dollars per share) | $ / shares	37.62
Exercised (in dollars per share) | $ / shares	32
Forfeited (in dollars per share) | $ / shares	32.65
Expired (in dollars per share) | $ / shares	32.79
Ending Balance (in dollars per share) | $ / shares	31.15
Vested, Ending Balance (in dollars per share) | $ / shares	27.67
Exercisable, Ending Balance (in dollars per share) | $ / shares	$ 27.67
Weighted Average Remaining Contractual Term (years)
Term , Ending Balance	7 years 3 months 4 days
Term Vested, Ending Balance	5 years 8 months 9 days
Term, Exercisable, Ending Balance	5 years 8 months 9 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Ending Balance | $	$ 20,798
Aggregate Intrinsic Value Vested, Ending Balance | $	13,243
Aggregate Intrinsic Value, Exercisable, Ending Balance | $	$ 13,243

Stock-based Compensation - Su72

Stock-based Compensation - Summary of Activity for Restricted Stock Units (Details) - Restricted stock units	12 Months Ended
	Dec. 31, 2016$ / sharesshares
Number of RSUs
Beginning balance (in shares) | shares	1,512,022
Granted (in shares) | shares	1,567,621
Vested (in shares) | shares	(1,112,838)
Forfeited (in shares) | shares	(107,394)
Ending balance (in shares) | shares	1,859,411
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 33.20
Granted (in dollars per share) | $ / shares	38.27
Vested (in dollars per share) | $ / shares	34.47
Forfeited (in dollars per share) | $ / shares	34.71
Ending balance (in dollars per share) | $ / shares	$ 36.63

Stock-based Compensation - Su73

Stock-based Compensation - Summary of Activity for Performance Units (Details) - Performance stock units	12 Months Ended
	Dec. 31, 2016$ / sharesshares
Number of PSUs
Beginning balance (in shares) | shares	550,088
Granted (in shares) | shares	5,000
Vested (in shares) | shares	(116,506)
Forfeited (in shares) | shares	(33,798)
Ending balance (in shares) | shares	404,784
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 26.87
Granted (in dollars per share) | $ / shares	45.90
Vested (in dollars per share) | $ / shares	30.13
Forfeited (in dollars per share) | $ / shares	23.72
Ending balance (in dollars per share) | $ / shares	$ 26.44

Commitments and Contingencies74

Commitments and Contingencies (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$ 5,700	$ 4,700	$ 3,600
2,017	5,807
2,018	5,024
2,019	3,171
2,020	2,132
2021 and thereafter	5,429
Total future minimum lease payments	$ 21,563

Segment and Geographic Inform75

Segment and Geographic Information - Summary of Revenue and Long-Lived Assets, Net, by Geographic Area (Detail) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2016USD ($)reporting_unit	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments | reporting_unit									1
Revenue:
Total revenue	$ 101,983	$ 84,122	$ 81,721	$ 73,136	$ 89,591	$ 69,097	$ 64,484	$ 55,671	$ 340,962	$ 278,843	$ 216,857
Long-Lived Assets, net
Total long-lived assets, net	30,524				27,314				30,524	27,314
North America
Revenue:
Total revenue									192,824	180,791	112,198
Long-Lived Assets, net
Total long-lived assets, net	22,909				21,135				22,909	21,135
United States
Revenue:
Total revenue									177,500	172,000	106,800
Long-Lived Assets, net
Total long-lived assets, net	22,600				20,900				22,600	20,900
EMEA
Revenue:
Total revenue									98,138	61,187	54,950
Long-Lived Assets, net
Total long-lived assets, net	4,683				5,008				4,683	5,008
Emerging Markets
Revenue:
Total revenue									50,000	36,865	$ 49,709
Long-Lived Assets, net
Total long-lived assets, net	$ 2,932				$ 1,171				$ 2,932	$ 1,171

401(k) Defined Contribution P76

401(k) Defined Contribution Plan - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
401 (k) Plan
Defined Contribution Plan [Line Items]
Contributions to 401(k) plan	$ 2.1	$ 1.8	$ 0.8

Quarterly Financial Data (Una77

Quarterly Financial Data (Unaudited) - Consolidated Results of Operations by Quarter (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 101,983	$ 84,122	$ 81,721	$ 73,136	$ 89,591	$ 69,097	$ 64,484	$ 55,671	$ 340,962	$ 278,843	$ 216,857
Gross profit	77,903	60,369	59,175	52,338	69,724	47,451	44,249	39,661	249,785	201,085	159,163
Income (loss) from operations	13,806	1,567	553	(419)	20,624	822	(4,928)	(1,275)	$ 15,507	$ 15,243	$ 6,574
Net income (loss)	$ 5,826	$ (605)	$ (2,895)	$ (1,509)	$ 11,622	$ (3,250)	$ (5,288)	$ (2,905)
Net income (loss) per share:
Basic (in dollars per share)	$ 0.19	$ (0.02)	$ (0.10)	$ (0.05)	$ 0.40	$ (0.11)	$ (0.18)	$ (0.10)	$ 0.03	$ 0.01	$ 0.01
Diluted (in dollars per share)	$ 0.18	$ (0.02)	$ (0.10)	$ (0.05)	$ 0.39	$ (0.11)	$ (0.18)	$ (0.10)	$ 0.03	$ 0.01	$ 0.01

Schedule II - Consolidated Va78

Schedule II - Consolidated Valuation Allowance and Qualifying Accounts Schedule II - Consolidated Valuation Allowance and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 85	$ 286	$ 128
Amounts Charged to Operations	313	4	274
Deductions	(290)	(205)	(116)
Additions Acquired from Business Combinations	0	0	0
Balance at End of Year	108	85	286
Valuation Allowance of Deferred Tax Assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	312	264	3,297
Amounts Charged to Operations	1,652	5	(3,033)
Deductions	(151)	0	0
Additions Acquired from Business Combinations	0	43	0
Balance at End of Year	$ 1,813	$ 312	$ 264