LivePerson (LPSN) 10-Q 9 Nov 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Nov. 07, 2016
Document - Document And Entity Information [Abstract]
Document Fiscal Period Focus	Q3
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2,016
Trading Symbol	lpsn
Entity Registrant Name	LIVEPERSON INC
Entity Central Index Key	1,102,993
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		57,970,850

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 51,405	$ 48,803
Cash held as collateral	3,966	5,409
Accounts receivable, net of allowance for doubtful accounts of $1,742 and $1,184 as of September 30, 2016 and December 31, 2015, respectively	29,488	30,388
Prepaid expenses and other current assets	10,847	9,327
Deferred tax assets, net	0	455
Total current assets	95,706	94,382
Property and equipment, net	24,111	24,129
Intangibles, net	20,012	24,619
Goodwill	80,381	80,322
Deferred tax assets, net	1,076	785
Other assets	2,425	1,957
Total assets	223,711	226,194
CURRENT LIABILITIES:
Accounts payable	5,768	7,102
Accrued expenses and other current liabilities	32,601	34,296
Deferred revenue	26,454	13,862
Total current liabilities	64,823	55,260
Other liabilities	3,254	3,270
Deferred tax liability	4,236	2,359
Total liabilities	72,313	60,889
Commitments and contingencies
STOCKHOLDERS’ EQUITY:
Common stock	58	57
Additional paid-in capital	289,907	286,856
Treasury stock	(2)	(1)
Accumulated deficit	(135,379)	(119,071)
Accumulated other comprehensive loss	(3,186)	(2,536)
Total stockholders’ equity	151,398	165,305
Total liabilities and stockholders’ equity	$ 223,711	$ 226,194

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 1,742	$ 1,184

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue		$ 54,518	$ 60,757	$ 166,662	$ 179,861
Costs and expenses
Cost of revenue	[1],[2],[3],[4]	14,837	18,225	48,210	52,531
Sales and marketing	[2],[3]	22,067	23,286	67,831	71,962
General and administrative	[2],[3],[4]	10,069	6,587	29,758	27,058
Product development	[2],[3]	9,495	9,567	29,428	29,476
Restructuring costs	[2],[3]	(384)	0	(384)	2,988
Amortization of purchased intangibles	[2],[3]	1,013	1,193	2,954	3,683
Total costs and expenses	[2],[3]	57,097	58,858	177,797	187,698
(Loss) income from operations		(2,579)	1,899	(11,135)	(7,837)
Other expense		(123)	(369)	(135)	(371)
(Loss) income before provision for (benefit from) income taxes		(2,702)	1,530	(11,270)	(8,208)
Provision for (benefit from) income taxes		3,177	(395)	5,038	(2,721)
Net (loss) income		$ (5,879)	$ 1,925	$ (16,308)	$ (5,487)
Basic net (loss) income per common share (in dollars per share)		$ (0.10)	$ 0.03	$ (0.29)	$ (0.10)
Diluted net (loss) income per common share (in dollars per share)		$ (0.10)	$ 0.03	$ (0.29)	$ (0.10)
Weighted average shares outstanding used in basic net (loss) income per common share calculation (in shares)		56,047,645	56,525,647	56,131,818	56,437,198
Weighted average shares outstanding used in diluted net (loss) income per common share calculation (in shares)		56,047,645	57,084,437	56,131,818	56,437,198
Stock compensation expense				$ 7,600	$ 8,793
Changes in fair value				0	(3,792)
Cost of revenue [Member]
Costs and expenses
Amortization of purchased intangibles		$ 697	$ 760	2,091	2,439
Stock compensation expense		121	288	342	1,092
Depreciation expense		1,756	2,266	6,469	6,491
Cost of revenue [Member] | Contact At Once! and Engage [Member]
Costs and expenses
Changes in fair value		1,300		1,500
Sales and marketing expense [Member]
Costs and expenses
Stock compensation expense		502	760	1,936	2,292
Depreciation expense		212	254	1,012	819
General and administrative expense [Member]
Costs and expenses
Stock compensation expense		759	911	2,552	2,590
Depreciation expense		435	190	1,215	663
General and administrative expense [Member] | Contact At Once! and Engage [Member]
Costs and expenses
Changes in fair value		(1,300)		(1,500)
Product development expense [Member]
Costs and expenses
Stock compensation expense		873	927	2,770	2,819
Depreciation expense		$ 247	$ 229	$ 749	$ 626
[1]	Amounts include amortization expense as follows: Cost of revenue $697 thousand and $760 thousand for the three months ended September 30, 2016 and 2015, respectively.Amounts include amortization expense as follows: Cost of revenue $2,091 thousand and $2,439 thousand for the three months ended September 30, 2016 and 2015, respectively.
[2]	Amounts include depreciation expense as follows: Cost of revenue $1,756 thousand and $2,266 thousand for the three months ended September 30, 2016 and 2015, respectively, Sales and marketing $212 thousand and $254 thousand for the three months ended September 30, 2016 and 2015, respectively, General and administrative $435 thousand and $190 thousand for the three months ended September 30, 2016 and 2015, respectively, and Product development $247 thousand and $229 thousand for the three months ended September 30, 2016 and 2015, respectively. Amounts include depreciation expense as follows: Cost of revenue $6,469 thousand and $6,491 thousand for the three months ended September 30, 2016 and 2015, respectively, Sales and marketing $1,012 thousand and $819 thousand for the three months ended September 30, 2016 and 2015, respectively, General and administrative $1,215 thousand and $663 thousand for the three months ended September 30, 2016 and 2015, respectively, and Product development $749 thousand and $626 thousand for the three months ended September 30, 2016 and 2015, respectively.
[3]	Amounts include stock compensation expense as follows: Cost of revenue $121 thousand and $288 thousand for the three months ended September 30, 2016 and 2015, respectively, Sales and marketing $502 thousand and $760 thousand for the three months ended September 30, 2016 and 2015, respectively, General and administrative $759 thousand and $911 thousand for the three months ended September 30, 2016 and 2015, respectively and Product development $873 thousand and $927 thousand for the three months ended September 30, 2016 and 2015, respectively. Amounts include stock compensation expense as follows: Cost of revenue $342 thousand and $1,092 thousand for thenine months ended September 30, 2016 and 2015, respectively, Sales and marketing $1,936 thousand and $2,292 thousand for the nine months ended September 30, 2016 and 2015, respectively, General and administrative $2,552 thousand and $2,590 thousand for the nine months ended September 30, 2016 and 2015, respectively and Product development $2,770 thousand and $2,819 thousand for the nine months ended September 30, 2016 and 2015, respectively.
[4]	The Company reclassified $1.3 million and $1.5 million in the three and nine months ended September 30, 2016, respectively, related to the fair value adjustment of the contingent earn-out for CAO! and Engage from cost of revenue to general and administrative expenses to conform to the full year presentation.

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (5,879)	$ 1,925	$ (16,308)	$ (5,487)
Foreign currency translation adjustment	1,848	(2,374)	(650)	(1,303)
Comprehensive loss	$ (4,031)	$ (449)	$ (16,958)	$ (6,790)

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
OPERATING ACTIVITIES:
Net (loss) income	$ (16,308)	$ (5,487)
Adjustments to reconcile net loss to net cash provided by operating activities:
Stock-based compensation expense	7,600	8,793
Depreciation	9,445	8,599
Amortization of purchased intangibles	5,045	6,122
Deferred income taxes and other non-cash tax items	163	(4,103)
Change in fair value contingent consideration	0	3,792
Provision for doubtful accounts, net	1,240	1,688
Changes in operating assets and liabilities:
Accounts receivable	(340)	(2,750)
Prepaid expenses and other current assets	(1,627)	(1,278)
Other assets	(32)	85
Accounts payable	(1,404)	(2,494)
Accrued expenses and other current liabilities	(1,690)	(2,705)
Deferred revenue	12,593	(1,697)
Other liabilities	1,865	2,300
Net cash provided by operating activities	16,550	10,865
INVESTING ACTIVITIES:
Purchases of property and equipment, including capitalized software	(9,251)	(11,047)
Cash held as collateral for foreign exchange forward contracts	1,443	(5,400)
Payments for acquisitions and intangible assets, net of cash acquired	(411)	(150)
Net cash used in investing activities	(8,219)	(16,597)
FINANCING ACTIVITIES:
Excess tax benefit from the exercise of employee stock options	0	796
Proceeds from issuance of common stock in connection with the exercise of options	838	3,758
Payments related to contingent consideration	0	(2,366)
Repurchase of common stock	(5,773)	(4,202)
Net cash used in financing activities	(4,935)	(2,014)
EFFECT OF FOREIGN EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(794)	(782)
CHANGE IN CASH AND CASH EQUIVALENTS	2,602	(8,528)
CASH AND CASH EQUIVALENTS - Beginning of the period	48,803	49,372
CASH AND CASH EQUIVALENTS - End of the period	51,405	40,844
SUPPLEMENTAL DISCLOSURE OF OTHER CASH FLOW INFORMATION:
Cash paid for income taxes	628	1,497
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Purchase of property and equipment recorded in accounts payable	53	277
Leasehold improvements funded by landlord	$ 107	$ 0

Description of Business and Bas

Description of Business and Basis of Presentation	9 Months Ended
	Sep. 30, 2016
Accounting Policies [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation LivePerson, Inc. (the “Company” or “LivePerson”) was incorporated in the State of Delaware in November 1995 and the LivePerson service was introduced in November 1998. In April 2000, the Company completed an initial public offering and is currently traded on the Nasdaq Global Select Market and the Tel Aviv Stock Exchange. LivePerson is headquartered in New York City, with U.S. offices in Alpharetta (Georgia) and international offices in Amsterdam, Berlin, London, Mannheim, Melbourne, Milan, Paris, Ra'anana (Israel), Reading (UK), and Tokyo. LivePerson provides mobile and online messaging technologies that power digital communication between brands and consumers. LiveEngage, the Company’s enterprise-class, cloud-based platform, enables businesses to create a meaningful connection with consumers by offering messaging as a preferred channel of communication. Messaging diminishes the need to rely on email systems or call a 1-800 number. Brands leverage LivePerson’s sophisticated intelligence engine and suite of text and mobile messaging, real-time chat messaging, content delivery, and co-browsing offerings to proactively engage with consumers through m-dot sites, mobile apps, the desktop, social media and third-party consumer messaging platforms. The Company’s campaign-based messaging enables the brand to target the right consumer at the right time on a brand’s site by leveraging proprietary analysis and data-driven intelligence. The data that the Company gathers and analyzes, on behalf of its customers, spans the breadth of an online or mobile visitor session, starting from an initial keyword search or application login, through actions on the website or mobile application of the Company’s customer, and even into a shopping cart and an executed sale. The Company combines this session data with other historical, behavioral and operational information to develop insights into each step of a consumer’s journey for sales and service transactions. These unique, industry- and use-case specific insights are mapped to each brand’s business goals in order to deliver successful campaign outcomes. LivePerson’s products, coupled with its domain knowledge, industry expertise and consulting services, have been proven to maximize the effectiveness of consumer engagement. The Company’s primary revenue source is from the sale of LivePerson services to businesses of all sizes. The Company also offers an online marketplace that connects independent service providers (“Experts”) who provide information and knowledge for a fee via mobile and online messaging with individual consumers (“Users”). Basis of Presentation The accompanying condensed consolidated financial statements as of September 30, 2016 and for the three and nine months ended September 30, 2016 and 2015 are unaudited. In the opinion of management, the unaudited condensed consolidated financial statements have been prepared on the same basis as the annual financial statements and reflect all adjustments, which include only normal recurring adjustments, necessary to present fairly the consolidated financial position of LivePerson as of September 30, 2016 , and the consolidated results of operations, comprehensive loss and cash flows for the interim periods ended September 30, 2016 and 2015 . The financial data and other information disclosed in these notes to the condensed consolidated financial statements related to these periods are unaudited. The results of operations for any interim period are not necessarily indicative of the results of operations for any other future interim period or for a full fiscal year. The condensed consolidated balance sheet at December 31, 2015 has been derived from audited consolidated financial statements at that date. Certain information and note disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). These unaudited interim condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto for the year ended December 31, 2015, included in the Company’s Annual Report on Form 10-K filed with the SEC on March 15, 2016. Principles of Consolidation The condensed consolidated financial statements include the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated. Reclassification For comparability, certain 2015 amounts have been reclassified, where appropriate, to conform to the financial presentation in 2016. The Company reclassified $1.3 million and $1.5 million in the three and nine ended September 30, 2016 , respectively, related to the fair value adjustment of the contingent earn-out for CAO! and Engage Pty Ltd. (“Engage”) from cost of revenue to general and administrative expenses. Use of Estimates The preparation of the Company’s condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of income and expenses during the reporting period. These estimates are based on information available as of the date of the condensed consolidated financial statements; therefore, actual results could differ from management’s estimates. Recently Issued Accounting Standards In August 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2016-15, “Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments” (“ASU 2016-15”). Topic 230 addresses the following eight specific cash flow issues: debt prepayment or debt extinguishment costs; settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing; contingent consideration payments made after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies (COLIs) (including bank-owned life insurance policies (BOLIs)); distributions received from equity method investees; beneficial interests in securitization transactions; and separately identifiable cash flows and application of the predominance principle. ASU 2016-15 is effective for financial statements issued for annual periods beginning after December 15, 2017, and interim periods within those annual periods. The Company is in the process of evaluating the impact of adoption of ASU 2016-15 on its financial statements. In March 2016, the FASB issued Accounting Standards Update No. 2016-09, “Compensation -Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting” (“ASU 2016-09”). This update is intended to improve the accounting for employee share-based payments and affects all organizations that issue share-based payment awards to their employees. Several aspects of the accounting for share-based payment award transactions are simplified, including:(a) income tax consequences; (b) classification of awards as either equity or liabilities; and(c)classification on the statement of cash flows. ASU 2016-09 is effective for financial statements issued for annual periods beginning after December 15, 2016. The Company is currently in the process of evaluating the impact of adoption of ASU 2016-09 on its financial statements. In February 2016, the FASB issued Accounting Standards Update No. 2016-02, "Leases" ("ASU 2016-02"). ASU 2016-02 requires lessees to recognize the following for all leases (with the exception of short-term leases) at the commencement date: a lease liability, which is a lessee‘s obligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Under the new guidance, lessor accounting is largely unchanged. Certain targeted improvements were made to align, where necessary, lessor accounting with the lessee accounting model and Topic 606, Revenue from Contracts with Customers. The new lease guidance also simplified the accounting for sale and leaseback transactions primarily because lessees must recognize lease assets and lease liabilities. Lessees will no longer be provided with a source of off-balance sheet financing. Lessees (for capital and operating leases) and lessors (for sales-type, direct financing, and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. Lessees and lessors may not apply a full retrospective transition approach. ASU 2016-02 is effective for financial statements issued for annual periods beginning after December 15, 2018. The Company is currently in the process of evaluating the impact of adoption of ASU 2016-02 on its financial statements. In November 2015, FASB issued Accounting Standards Update No. 2015-17, “Income taxes: Balance Sheet Classification of Deferred Taxes Business” (“ASU 2015-17”). Topic 740, Income Taxes, requires an entity to separate deferred income tax liabilities and assets into current and noncurrent amounts in a classified statement of financial position. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. Deferred tax liabilities and assets that are not related to an asset or liability for financial reporting are classified according to the expected reversal date of the temporary difference. To simplify the presentation of deferred income taxes, ASU 2015-17 requires that deferred income tax liabilities and assets be classified as noncurrent in a classified statement of financial position. ASU 2015-17 is effective for financial statements issued for annual periods beginning after December 15, 2016, and interim periods within those annual periods. The Company has elected to early adopt ASU 2015-17 on its financial statements during the second quarter of 2016 on a prospective basis. In September 2015, FASB issued Accounting Standards Update No. 2015-16, “Business Combinations: Simplifying the Accounting for Measurement-Period Adjustments” (“ASU 2015-16”). ASU 2015-16 requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The amendments in ASU 2015-16 require that the acquirer record, in the same period’s financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. ASU 2015-16 is effective for annual reporting periods beginning after December 15, 2015. This standard became effective for the Company in the first quarter of 2016, and is applied on a prospective basis to adjustments to provisional amounts that occur after the effective date with no material impact to its financial statements. In February 2015, FASB issued Accounting Standards Update No. 2015-02, Consolidation: Amendments to the Consolidation Analysis (“ASU 2015-02”), which affects reporting entities that are required to evaluate whether they should consolidate certain legal entities. All legal entities are subject to reevaluation under the revised consolidation model. The standard amends the consolidation requirements in ASC 810. ASU 2015-02 is effective for fiscal periods beginning after December 15, 2015 for public companies, and early adoption is permitted. The Company adopted this standard during the first quarter of 2016 and there was no material impact to its financial statements. In May 2014, FASB issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”), which supersedes most existing revenue recognition guidance under GAAP. The core principle of ASU 2014-09 is to recognize revenues when promised goods or services are transferred to customers in an amount that reflects the consideration to which an entity expects to be entitled for those goods or services. ASU 2014-09 defines a five step process to achieve this core principle and, in doing so, more judgment and estimates may be required within the revenue recognition process than are required under existing GAAP. The standard is effective for annual periods beginning after December 15, 2017, and interim periods therein, using either of the following transition methods: (i) a full retrospective approach reflecting the application of the standard in each prior reporting period with the option to elect certain practical expedients, or (ii) a retrospective approach with the cumulative effect of initially adopting ASU 2014-09 recognized at the date of adoption (which includes additional footnote disclosures). In March 2016, the FASB issued implementation guidance that clarified the considerations in principal versus agent determination. In April 2016, the FASB issued guidance that clarified identifying performance obligations and licensing implementation guidance contained in the new revenue recognition standard. In May 2016, FASB issued guidance that addresses narrow-scope improvements to the guidance on collectability, noncash consideration, and completed contracts at transition. The Company will adopt this guidance at the beginning of its first quarter of fiscal year 2018. Adoption of this guidance is not expected to have a material impact on the Company’s financial statements.

Revenue Recognition

Revenue Recognition	9 Months Ended
	Sep. 30, 2016
Revenue Recognition [Abstract]
Revenue Recognition	Revenue Recognition The majority of the Company’s revenue is generated from monthly service revenues and related professional services from the sale of the LivePerson services. Because the Company provides its application as a service, the Company follows the provisions of FASB Accounting Standards Codification (“ASC”) 605-10-S99, “Revenue Recognition” and ASC 605-25, “Revenue Recognition with Multiple-Element Arrangements.” The Company charges a monthly, quarterly or annual fee, which varies by type of service, the level of customer usage and website traffic, and in some cases, the number of orders placed via the Company’s online engagement solutions. For certain of the Company’s larger customers, the Company may provide call center labor through an arrangement with one or more of several qualified vendors. For most of these customers, the Company passes the fee it incurs with the labor provider and its fee for the hosted services through to its customers in the form of a fixed fee for each order placed via the Company’s online engagement solutions. For these Pay for Performance (“PFP”) arrangements, in accordance with ASC 605-45, “Principal Agent Considerations,” the Company records revenue for transactions in which it acts as an agent on a net basis, and revenue for transactions in which it acts as a principal on a gross basis. The Company also sells certain of the LivePerson services directly via Internet download. These services are marketed as LiveEngage for small to medium-sized businesses, and are paid for almost exclusively by credit card. Credit card payments accelerate cash flow and reduce the Company’s collection risk, subject to the merchant bank’s right to hold back cash pending settlement of the transactions. Sales of LiveEngage may occur with or without the assistance of an online sales representative, rather than through face-to-face or telephone contact that is typically required for traditional direct sales. The Company recognizes monthly service revenue based upon the fee charged for the LivePerson services, provided that there is persuasive evidence of an arrangement, no significant Company obligations remain, collection of the resulting receivable is probable and the amount of fees to be paid is fixed or determinable. The Company’s service agreements typically have twelve month terms and, in some cases, are terminable or may terminate upon 30 to 90 days’ notice without penalty. When professional service fees add value to the customer on a standalone basis, the Company recognizes professional service fees upon completion and customer acceptance. The Company establishes a selling price hierarchy for determining the selling price of a deliverable, which is based on: (a) vendor-specific objective evidence; (b) third-party evidence; or (c) best estimated selling price. If a professional services arrangement does not qualify for separate accounting, the Company recognizes the fees, and the related labor costs, ratably over the contracted period. For revenue from the Company’s Consumer segment generated from online transactions between Experts and Users, the Company recognizes revenue net of the Expert fees in accordance with ASC 605-45, “Principal Agent Considerations,” due primarily to the fact that the Expert is the primary obligor. Additionally, the Company performs as an agent without any risk of loss for collection, and is not involved in selecting the Expert or establishing the Expert’s fee. The Company collects a fee from the User and retains a portion of the fee, and then remits the balance to the Expert. Revenue from these transactions is recognized when there is persuasive evidence of an arrangement, no significant Company obligations remain, collection of the resulting receivable is probable and the amount of fees to be paid is fixed and determinable.

Net Income (Loss) Per Share

Net Income (Loss) Per Share	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	Net Income (Loss) Per Share The Company calculates earnings per share (“EPS”) in accordance with the provisions of ASC 260-10 and the guidance of SEC Staff Accounting Bulletin (“SAB”) No. 98. Under ASC 260-10, basic EPS excludes dilution for common stock equivalents and is computed by dividing net income or loss attributable to common shareholders by the weighted average number of common shares outstanding for the period. All options, warrants or other potentially dilutive instruments issued for nominal consideration are required to be included in the calculation of basic and diluted net income attributable to common stockholders. Diluted EPS is calculated using the treasury stock method and reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock and resulted in the issuance of common stock. Diluted net loss per common share for the three and nine months ended September 30, 2016 does not include the effect of 9,492,949 outstanding common stock awards, as the effect of their inclusion is anti-dilutive. Diluted net loss per common share for the three months ended September 30, 2015 includes the effect of options to purchase 1,429,142 shares of outstanding common stock with a weighted average exercise price of $9.02 . Diluted net loss per common share for the three months ended September 30, 2015 does not include the effect of 8,140,127 outstanding common stock awards, as the effect of their inclusion is anti-dilutive. Diluted net loss per common share for the nine months ended September 30, 2015 does not include the effect of 9,569,269 outstanding common stock awards, as the effect of their inclusion is anti-dilutive. A reconciliation of shares used in calculating basic and diluted net loss per share follows: Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Basic 56,047,645 56,525,647 56,131,818 56,437,198 Effect of assumed exercised options — 558,790 — — Diluted 56,047,645 57,084,437 56,131,818 56,437,198

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Segment Information	Segment Information The Company accounts for its segment information in accordance with the provisions of ASC 280-10, “Segment Reporting.” ASC 280-10 establishes annual and interim reporting standards for operating segments of a company. ASC 280-10 requires disclosures of selected segment-related financial information about products, major customers, and geographic areas based on the Company’s internal accounting methods. The Company is organized into two operating segments for purposes of making operating decisions and assessing performance. The Business segment facilitates real-time online interactions – chat, voice and content delivery across multiple channels and screens for global corporations of all sizes. The Consumer segment facilitates online transactions between Experts and Users and sells its services to consumers. Both segments currently generate their revenue primarily in the United States. The chief operating decision maker, who is the chief executive officer, evaluates performance, makes operating decisions, and allocates resources based on the operating income of each segment. The reporting segments follow the same accounting polices used in the preparation of the Company’s condensed consolidated financial statements which are described in the summary of significant accounting policies. The Company allocates cost of revenue, sales and marketing and amortization of purchased intangibles to the segments, but it does not allocate product development expenses, general and administrative expenses, restructuring costs and income tax expense because management does not use this information to measure performance of the operating segments. There are currently no inter-segment sales. Summarized financial information by segment for the three months ended September 30, 2016 , based on the Company’s internal financial reporting system utilized by the Company’s chief operating decision maker, follows (amounts in thousands): Business Consumer Corporate Consolidated Revenue: Hosted services – Business $ 44,553 $ — $ — $ 44,553 Hosted services – Consumer — 4,044 — 4,044 Professional services 5,921 — — 5,921 Total revenue 50,474 4,044 — 54,518 Cost of revenue 14,215 622 — 14,837 Sales and marketing 20,278 1,789 — 22,067 Amortization of purchased intangibles 1,013 — — 1,013 Unallocated corporate expenses — — 19,180 19,180 Operating income (loss) $ 14,968 $ 1,633 $ (19,180 ) $ (2,579 ) Summarized financial information by segment for the three months ended September 30, 2015 , based on the Company’s internal financial reporting system utilized by the Company’s chief operating decision maker, follows (amounts in thousands): Business Consumer Corporate Consolidated Revenue: Hosted services – Business $ 50,957 $ — $ — $ 50,957 Hosted services – Consumer — 3,661 — 3,661 Professional services 6,139 — — 6,139 Total revenue 57,096 3,661 — 60,757 Cost of revenue 17,652 573 — 18,225 Sales and marketing 21,333 1,953 — 23,286 Amortization of purchased intangibles 1,193 — — 1,193 Unallocated corporate expenses — — 16,154 16,154 Operating income (loss) $ 16,918 $ 1,135 $ (16,154 ) $ 1,899 Summarized financial information by segment for the nine months ended September 30, 2016 , based on the Company’s internal financial reporting system utilized by the Company’s chief operating decision maker, follows (amounts in thousands): Business Consumer Corporate Consolidated Revenue: Hosted services – Business $ 137,240 $ — $ — $ 137,240 Hosted services – Consumer — 12,048 — 12,048 Professional services 17,374 — — 17,374 Total revenue 154,614 12,048 — 166,662 Cost of revenue 46,145 2,065 — 48,210 Sales and marketing 62,606 5,225 — 67,831 Amortization of purchased intangibles 2,954 — — 2,954 Unallocated corporate expenses — — 58,802 58,802 Operating income (loss) $ 42,909 $ 4,758 $ (58,802 ) $ (11,135 ) Summarized financial information by segment for the nine months ended September 30, 2015 , based on the Company’s internal financial reporting system utilized by the Company’s chief operating decision maker, follows (amounts in thousands): Business Consumer Corporate Consolidated Revenue: Hosted services – Business $ 151,767 $ — $ — $ 151,767 Hosted services – Consumer — 11,219 — 11,219 Professional services 16,875 — — 16,875 Total revenue 168,642 11,219 — 179,861 Cost of revenue 50,752 1,779 — 52,531 Sales and marketing 66,865 5,097 — 71,962 Amortization of purchased intangibles 3,683 — — 3,683 Unallocated corporate expenses — — 59,522 59,522 Operating income (loss) $ 47,342 $ 4,343 $ (59,522 ) $ (7,837 ) Geographic Information The Company is domiciled in the United States and has international operations in the United Kingdom, Asia-Pacific, Latin America and Western Europe, particularly France and Germany. The following table presents the Company’s revenues attributable to domestic and foreign operations for the periods presented (amounts in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 United States $ 35,114 $ 39,972 $ 111,177 $ 120,409 Other Americas (1) 2,073 3,589 5,165 9,437 Total Americas 37,187 43,561 116,342 129,846 EMEA (2) (4) 12,588 13,237 36,468 38,443 APAC (3) 4,743 3,959 13,852 11,572 Total revenue $ 54,518 $ 60,757 $ 166,662 $ 179,861 (1) Canada, Latin America and South America (2) Europe, the Middle East and Africa (“EMEA”) (3) Asia-Pacific (“APAC”) (4) Includes revenues from the United Kingdom of $8.9 million and $25.7 million for the three and nine months ended September 30, 2016, respectively. For the three and nine months ended September 30, 2015, revenues from the United Kingdom were $9.8 million and $28.1 million , respectively. The following table presents the Company’s long-lived assets by geographic region for the periods presented (amounts in thousands): September 30, December 31, 2016 2015 United States $ 94,716 $ 96,362 Israel 14,589 16,393 Australia 9,161 8,290 Netherlands 7,358 8,285 Other (1) 2,181 2,482 Total long-lived assets $ 128,005 $ 131,812 (1) United Kingdom, Germany, Japan, France and Italy No individual customer accounted for 10% or more of consolidated revenue for any of the periods presented. No individual customer accounted for 10% or more of accounts receivable as of September 30, 2016 and December 31, 2015

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill The changes in the carrying amount of goodwill for the nine months ended September 30, 2016 are as follows (amounts in thousands): Business Consumer Consolidated Balance as of December 31, 2015 $ 72,298 $ 8,024 $ 80,322 Adjustments to goodwill: Foreign exchange adjustment 59 — 59 Balance as of September 30, 2016 $ 72,357 $ 8,024 $ 80,381 Intangible Assets Intangible assets are summarized as follows (see Note 8) (amounts in thousands): As of September 30, 2016 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Amortization Period Amortizing intangible assets: Technology $ 28,059 $ (18,777 ) $ 9,282 4.7 years Customer relationships 16,018 (8,359 ) 7,659 5.8 years Trade names 1,298 (1,275 ) 23 2.6 years Non-compete agreements 1,448 (1,149 ) 299 1.7 years Patents 3,851 (1,129 ) 2,722 10.4 years Other 262 (235 ) 27 3.0 years Total $ 50,936 $ (30,924 ) $ 20,012 As of December 31, 2015 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Amortization Period Amortizing intangible assets: Technology $ 28,005 $ (15,723 ) $ 12,282 4.7 years Customer relationships 16,008 (6,873 ) 9,135 5.8 years Trade names 1,287 (1,250 ) 37 2.6 years Non-compete agreements 1,446 (936 ) 510 1.7 years Patents 3,440 (848 ) 2,592 9.3 years Other 312 (249 ) 63 3.0 years Total $ 50,498 $ (25,879 ) $ 24,619 Amortization expense is calculated over the estimated useful life of the asset. Aggregate amortization expense for intangible assets was $1.7 million and $2.0 million for the three months ended September 30, 2016 and 2015, respectively. Aggregate amortization expense for intangible assets was $ 5.0 million and $ 6.1 million for the nine months ended September 30, 2016 and 2015, respectively. For the three and nine months ended September 30, 2016 and 2015, respectively, a portion of this amortization is included in cost of revenue. Estimated amortization expense for the next five years is as follows (amounts in thousands): Estimated Amortization Expense 2016 $ 1,634 2017 4,933 2018 2,834 2019 2,620 2020 2,425 Thereafter 5,566 Total $ 20,012

Property and Equipment

Property and Equipment	9 Months Ended
	Sep. 30, 2016
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment The following table presents the detail of property and equipment for the periods presented (amounts in thousands): September 30, December 31, Computer equipment and software $ 76,838 $ 67,631 Furniture, equipment and building improvements 13,981 13,761 90,819 81,392 Less: accumulated depreciation (66,708 ) (57,263 ) Total $ 24,111 $ 24,129 In accordance with its policy, the Company reviews the estimated useful lives of its fixed assets on an ongoing basis. This review indicated that the actual lives of certain co-location assets were longer than the estimated useful lives used for depreciation purposes in the Company’s financial statements. As a result, effective August 1, 2016, the Company changed its estimates of the useful lives of its co-location assets to better reflect the estimated periods during which these assets will remain in service. The estimated useful lives of the co-location assets that previously averaged three years were increased to an average of four years. The effect of this change in estimate was to reduce depreciation expense for the three and nine months ended September 30, 2016 by $0.4 million , decrease net loss by $0.4 million , and decrease basic and diluted loss per share by $0.01 .

Accrued Liabilities

Accrued Liabilities	9 Months Ended
	Sep. 30, 2016
Payables and Accruals [Abstract]
Accrued Liabilities	Accrued Expenses and Other Current Liabilities The following table presents the detail of accrued expenses and other current liabilities for the periods presented (amounts in thousands): September 30, December 31, Payroll and other employee related costs $ 14,935 $ 14,107 Professional services and consulting and other vendor fees 11,068 12,372 Sales commissions 2,466 4,522 Contingent earnout (see Notes 8 and 9) 210 377 Other 3,922 2,918 Total $ 32,601 $ 34,296

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2016
Business Combinations [Abstract]
Acquisitions	Acquisitions Engage Pty Ltd. On November 9, 2012 , the Company acquired all of the outstanding shares of Engage Pty Ltd. (“Engage”), an Australian provider of cloud-based customer contact solutions. The transaction was accounted for under the purchase method of accounting and, accordingly, the operating results of Engage were included in the Company’s consolidated results of operations from the date of acquisition. The purchase price was approximately $10.6 million. The total acquisition costs incurred in the year ended December 31, 2012 were approximately $0.5 million and are included in general and administrative expenses in the Company’s condensed consolidated statements of operations for the same period. The acquisition enhances the Company’s ability to offer intelligent engagement solutions to businesses in the Asia Pacific region. Of the total purchase price, $0.8 million was allocated to the net book values of the acquired assets and assumed liabilities. The historical carrying amounts of such assets and liabilities approximated their fair values. All receivables acquired are expected to be collectible. The purchase price in excess of the fair value of the net book values of the assets acquired and liabilities assumed was allocated to intangible assets based on management’s best estimate of fair values, taking into account all relevant information available at the time of acquisition, and the excess was allocated to goodwill. The goodwill is not deductible for tax purposes. The intangible assets are being amortized over their expected period of benefit. The purchase price includes approximately $1.7 million of potential earn-out consideration for the shareholders if certain revenue targets are achieved. The earn-out is payable in shares of LivePerson common stock and cash. The Company recorded the contingent earn-out as part of the purchase price. In accordance with ASC 480, the Company had classified this amount as a liability with the amount included in accrued expenses. At June 30, 2015, the Company assessed this earn-out and recorded a $0.7 million fair value re-measurement adjustment, which was recorded in operating income as a decrease to general and administrative expenses. As of September 30, 2016 , there was no remaining liability included in accrued expenses relating to this earn-out. Synchronite, LLC On June 2, 2014 , the Company acquired Synchronite, LLC (“Synchronite”), a German-based start-up that provides co-browsing technology. The transaction was accounted for under the purchase method of accounting and, accordingly, the operating results of Synchronite were included in the Company’s consolidated results of operations from the date of acquisition. The allocation of the total purchase price of approximately $4.1 million was based upon the estimated fair value of Synchronite’s net tangible and identifiable intangible assets as of the date of acquisition. The total acquisition costs incurred were approximately $0.4 million and are included in general and administrative expenses in the Company’s condensed consolidated statements of operations. Of the total purchase price, $45,000 was allocated to the net book values of the acquired assets and assumed liabilities. The historical carrying amounts of such assets and liabilities approximated their fair values. All receivables acquired are expected to be collectible. The purchase price includes approximately $2.7 million of goodwill and approximately $1.5 million of intangible assets. The goodwill is deductible for tax purposes. The intangible assets are being amortized over their expected period of benefit. The purchase price includes $1.8 million of potential earn-out consideration for the shareholders if complete product integration is achieved. The earn-out is payable in shares of LivePerson common stock and cash. The Company recorded the contingent earn-out as part of the purchase price. In accordance with ASC 480, the Company has classified this amount as a liability and the amount is included in accrued expenses in the September 30, 2016 condensed consolidated balance sheet, due to the variable number of shares that will be issued if and when the targets are achieved. For the year ended December 31, 2015, the Company made $1.6 million of earn-out payments. The remaining potential earn-out consideration at September 30, 2016 was $0.2 million . The Company will continue to assess the earn-out calculation in future periods and any future adjustments will affect operating income. Contact At Once!, LLC On November 7, 2014 , the Company acquired Contact At Once!, LLC (“CAO!”), a software company with a cloud-based platform that instantly connects consumers with businesses through instant messaging, text messaging, chat, social media and video over the internet for consumer-to-business sales conversions. The transaction was accounted for under the purchase method of accounting and, accordingly, the operating results of CAO! were included in the Company’s consolidated results of operations from the date of acquisition. The allocation of the total purchase price of approximately $67.0 million , which includes approximately $42.8 million in cash, approximately $20.0 million in shares of common stock and approximately $4.2 million of potential earn-out consideration in cash, was based upon the estimated fair value of CAO!’s net tangible and identifiable intangible assets as of the date of acquisition. The historical carrying amounts of such assets and liabilities approximated their fair values. All receivables acquired are expected to be collectible. The purchase price includes approximately $45.1 million of goodwill and approximately $20.4 million of intangible assets. The goodwill will be deductible for tax purposes. The intangible assets are being amortized over their expected period of benefit. The purchase price includes $4.2 million of potential earn-out consideration for the shareholders if certain targeted financial, strategic and integration objectives is achieved. The earn-out is payable in cash. The Company recorded the contingent earn-out as part of the purchase price. In accordance with ASC 480, the Company had classified this amount as a liability included in accrued expenses in the consolidated balance sheet. During the year ended December 31, 2015 , the Company assessed this earn-out and recorded a $3.2 million fair value re-measurement adjustment, which was recorded in loss from operations as a decrease to general and administrative expenses. During the nine months ended September 30, 2016 , the Company made cash payments of $0.2 million . There is no remaining liability included in accrued expenses relating to this contingent earn-out as of September 30, 2016 .

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company measures its cash equivalents at fair value based on an expected exit price as defined by the authoritative guidance on fair value measurements, which represents the amount that would be received on the sale of an asset or paid to transfer a liability, as the case may be, in an orderly transaction between market participants. As such, fair value may be based on assumptions that market participants would use in pricing an asset or liability. The authoritative guidance on fair value measurements establishes a consistent framework for measuring fair value on either a recurring or nonrecurring basis whereby inputs, used in valuation techniques, are assigned a hierarchical level. The following are the hierarchical levels of inputs to measure fair value: • Level 1: Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. • Level 2: Inputs reflect: quoted prices for identical assets or liabilities in markets that are not active; quoted prices for similar assets or liabilities in active markets; inputs other than quoted prices that are observable for the assets or liabilities; or inputs that are derived principally from or corroborated by observable market data by correlation or other means. • Level 3: Unobservable inputs reflecting the Company’s assumptions incorporated in valuation techniques used to determine fair value. These assumptions are required to be consistent with market participant assumptions that are reasonably available. Financial Assets and Liabilities The carrying amount of cash, accounts receivable, and accounts payable approximate their fair value due to their short-term nature. The Company ’ s assets and liabilities that are measured at fair value on a recurring basis, by level, within the fair value hierarchy as of September 30, 2016 and December 31, 2015 , are summarized as follows (amounts in thousands). The Company’s restricted cash balance of $4.0 million at September 30, 2016 and $5.4 million at December 31, 2015 is not held in a money market account and is not included in the following table. September 30, 2016 December 31, 2015 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets: Cash equivalents: Money market funds $ 3,073 $ — $ — $ 3,073 $ 4,059 $ — $ — $ 4,059 Foreign currency derivative contracts — 965 — 965 — 102 — 102 Total assets $ 3,073 $ 965 $ — $ 4,038 $ 4,059 $ 102 $ — $ 4,161 Liabilities: Contingent earn-outs $ — $ — $ 210 $ 210 $ — $ — $ 377 $ 377 Foreign currency derivative contracts — 3 — 3 — 310 — 310 Total liabilities $ — $ 3 $ 210 $ 213 $ — $ 310 $ 377 $ 687 In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible as well as considers counterparty credit risk in its assessment of fair value. Observable or market inputs reflect market data obtained from independent sources, while unobservable inputs reflect the Company’s assumptions based on the best information available. The Company's money market funds are measured at fair value on a recurring basis based on quoted market prices in active markets and are classified as level 1 within the fair value hierarchy. The Company's contingent earn-out liability and foreign currency derivative contracts are measured at fair value on a recurring basis and are classified as level 3 and level 2, respectively, within the fair value hierarchy. On a nonrecurring basis, the Company uses fair value measures when analyzing asset impairment. Long-lived tangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If it is determined such indicators are present and the review indicates that the assets will not be fully recoverable, based on undiscounted estimated cash flows over the remaining amortization periods, their carrying values are reduced to estimated fair value. The Company uses an income approach and inputs that constitute level 3. During the third quarter of each year, the Company evaluates goodwill for impairment at the reporting unit level. The Company uses qualitative factors in accordance with ASU No. 2011-08 to determine whether 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. This measurement is classified based on level 3 input. The remaining contingent earn-out amounts as of September 30, 2016 are recorded in accrued expense on the condensed consolidated balance sheet and are payable in 2016. The contingent earn-out balance as of September 30, 2016 relates to Synchronite and is based on the fulfillment of a complete product integration and a minimum number of “Co-Browse” interactions per month. The changes in fair value of the Level 3 liabilities are as follows (amounts in thousands): Contingent Earn-Out September 30, 2016 December 31, 2015 Balance, Beginning of Period $ 377 $ 6,940 Cash payments (167 ) (2,883 ) Changes in fair value — (3,680 ) Balance, End of Period $ 210 $ 377 Derivative Financial Instruments The Company is exposed to foreign exchange risks that in part are managed by using derivative financial instruments. The Company entered into foreign currency forward contracts related to risks associated with foreign operations. The Company does not use derivatives for trading purposes. Derivatives are recorded at their estimated fair values based upon Level 2 inputs. Derivatives designated and effective as cash flow hedges are reported as a component of other comprehensive income and reclassified to earnings in the same periods in which the hedged transactions impact earnings. Gains and losses related to derivatives not meeting the requirements of hedge accounting and the portion of derivatives related to hedge ineffectiveness are recognized in current earnings. In accordance with the foreign currency forward contracts, the Company was required to pledge cash as collateral security to be maintained at the bank. The collateral shall remain in control of the lender, and these funds can be used to satisfy the outstanding obligation. Accordingly, the Company had cash at the bank of approximately $4.0 million at September 30, 2016 , and $5.4 million at December 31, 2015 recorded as cash held as collateral in current assets. The following summarizes certain information regarding the Company’s outstanding foreign currency derivative contracts related primarily to intercompany receivables and payables for the periods presented (in thousands): As of September 30, 2016 As of December 31, 2015 Notional amount of foreign currency derivative contracts $ 36,658 $ 43,431 Fair value of foreign currency derivatives contracts $ 962 $ (208 ) The fair value of the Company’s derivative instruments is summarized below (in thousands): Fair Value of Derivative Instruments Balance Sheet Location As of September 30, 2016 As of December 31, 2015 Derivative Assets Derivatives not designated as hedging instruments: Foreign currency derivatives contracts Prepaid expenses and other current assets $ 965 $ 102 Derivative Liabilities Derivatives not designated as hedging instruments: Foreign currency derivatives contracts Accrued expenses and other liabilities $ 3 $ 310 The following summarizes certain information regarding the Company’s derivatives that are not designated or are not effective as hedges (in thousands): Gain (losses) on Derivative Instruments Recognized in Statements of Operations Three Months Ended September 30, Nine Months Ended September 30, Location 2016 2015 2016 2015 Foreign currency derivatives contracts Other expense $ 44 $ (85 ) $ 132 $ (52 )

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Contractual Obligations The Company leases facilities and certain equipment under agreements accounted for as operating leases. These leases generally require the Company to pay all executory costs such as maintenance and insurance. Rental expense for operating leases for the three and nine months ended September 30, 2016 was approximately $2.4 million and $7.6 million , respectively. Rental expense for operating leases for the three and nine months ended September 30, 2015 was approximately $2.4 million and $5.9 million , respectively. Employee Benefit Plans The Company has a 401(k) defined contribution plan covering all eligible employees. The Company provides for employer matching contributions equal to 50% of employee contributions, up to the lesser of 5% of eligible compensation or $6,000 . Matching contributions are deposited into the employee’s 401(k) account and are subject to 5 year graded vesting. Salaries and related expenses include $0.3 million and $1.0 million of employer matching contributions for the three and nine months ended September 30, 2016 , respectively. Salaries and related expenses include $0.3 million and $1.0 million of employer matching contributions for the three and nine months ended September 30, 2015 , respectively. Letters of Credit As of September 30, 2016 , the Company has a $1.9 million letter of credit outstanding substantially in favor of a certain landlord for office space. In addition, the Company has a letter of credit totaling $0.1 million as a security deposit for the due performance by the Company of the terms and conditions of a supply contract. There were no draws against these letters of credit during the three and nine months ended September 30, 2016 .

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stockholders' Equity	Stockholders ’ Equity Common Stock As of September 30, 2016 , there were 100,000,000 shares of common stock authorized, and 57,919,090 shares issued and outstanding. As of December 31, 2015 , there were 100,000,000 shares of common stock authorized, and 57,374,907 shares issued and outstanding. The par value for common shares is $0.001 . Preferred Stock As of September 30, 2016 and December 31, 2015 , there were 5,000,000 shares of preferred stock authorized, and zero shares issued and outstanding. The par value for preferred shares is $0.001 . Stock Repurchase Program On December 10, 2012, the Company’s Board of Directors approved a stock repurchase program through June 30, 2014. Under the stock repurchase program, the Company is authorized to repurchase shares of its common stock, in the open market or privately negotiated transactions, at times and prices considered appropriate by the Board of Directors depending upon prevailing market conditions and other corporate considerations. On March 13, 2014, the Company’s Board of Directors increased the aggregate purchase price of the stock repurchase program from $30.0 million to $40.0 million . On July 23, 2014, the Company’s Board of Directors increased the aggregate purchase price of the stock repurchase program from $40.0 million to $50.0 million . On March 5, 2015, the Company’s Board of Directors extended the expiration date of the program out to December 31, 2016. On February 16, 2016, the Company's Board of Directors increased the aggregate purchase price of the total stock repurchase program by an additional $14.0 million . There were 1,027,349 shares repurchased under this program during the nine months ended September 30, 2016 , which were recorded in treasury stock at par on the condensed consolidated balance sheets as of September 30, 2016 . As of September 30, 2016 , approximately $14.3 million remained available for purchase under the program. Stock-Based Compensation The Company follows FASB ASC 718-10, “Stock Compensation,” which addresses the accounting for transactions in which an entity exchanges its equity instruments for goods or services, with a primary focus on transactions in which an entity obtains employee services in share-based payment transactions. ASC 718-10 requires measurement of the cost of employee services received in exchange for an award of equity instruments based on the grant-date fair value of the award (with limited exceptions). Incremental compensation costs arising from subsequent modifications of awards after the grant date must be recognized. The per share weighted average fair value of stock options granted during the three and nine months ended September 30, 2016 was $3.11 and $2.94 , respectively. The per share weighted average fair value of stock options granted during the three and nine months ended September 30, 2015 was $4.10 and $4.47 , respectively. The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions: Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Dividend yield 0.0% 0.0% 0.0% 0.0% Risk-free interest rate 1.1% 1.7% 1.0% - 1.4% 1.3% - 1.7% Expected life (in years) 5 5 5 5 Historical volatility 47.9% 47.4% 47.3% - 48.2% 47.4% - 49.7% A description of the methods used in the significant assumptions used to estimate the fair value of stock-based compensation awards follows: Dividend yield – The Company uses 0% as it has never issued dividends and does not anticipate issuing dividends in the near term. Risk-free interest rate – The Company uses the market yield on U.S. Treasury securities at five years with constant maturity, representing the current expected life of stock options in years. Expected life – The Company uses historical data to estimate the expected life of a stock option. Historical volatility – The Company uses a trailing five year from grant date to determine volatility. Stock Option Plans During 1998, the Company established the Stock Option and Restricted Stock Purchase Plan (the “1998 Plan”). Under the 1998 Plan, the Board of Directors could issue incentive stock options or nonqualified stock options to purchase up to 5,850,000 shares of common stock. The 2000 Stock Incentive Plan (the “2000 Plan”) succeeded the 1998 Plan. Under the 2000 Plan, the options which had been outstanding under the 1998 Plan were incorporated in the 2000 Plan increasing the number of shares available for issuance under the plan by approximately 4,150,000 , thereby reserving for issuance 10,000,000 shares of common stock in the aggregate. The Company established the 2009 Stock Incentive Plan (as amended and restated, the “2009 Plan”) as a successor to the 2000 Plan. Under the 2009 Plan, the options which had been outstanding under the 2000 Plan were incorporated into the 2009 Plan and the Company increased the number of shares available for issuance under the plan by 6,000,000 . The Company amended the 2009 stock incentive plan (the “Amended 2009 Plan”) effective June 7, 2012. The Amended 2009 Plan increased the number of shares authorized for issuance under the plan by an additional 4,250,000 , thereby reserving for issuance 23,817,744 shares of common stock in the aggregate. Options to acquire common stock granted thereunder have 10 -year terms. As of September 30, 2016 , approximately 2,014,000 shares of common stock were reserved for issuance under the 2009 Plan (taking into account all option exercises through September 30, 2016 ). Employee Stock Purchase Plan In June 2010, the Company’s stockholders approved the 2010 Employee Stock Purchase Plan with 1,000,000 shares of common stock initially reserved for issuance. As of September 30, 2016 , approximately 239,000 shares of common stock were reserved for issuance under the Employee Stock Purchase Plan (taking into account all share purchases through September 30, 2016 ). Stock Option Activity A summary of the Company’s stock option activity and weighted average exercise prices follows: Stock Option Activity Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) Options (in thousands) Weighted Average Exercise Price Balance outstanding at December 31, 2015 9,139 $ 11.05 Granted 473 6.92 Exercised (115 ) 5.54 Cancelled or expired (1,277 ) 11.42 Balance outstanding at September 30, 2016 8,220 $ 10.83 6.02 $ 4,452 Options vested and expected to vest 7,761 $ 10.92 5.86 $ 4,169 Options exercisable at September 30, 2016 5,898 $ 11.11 5.19 $ 3,724 The total fair value of stock options exercised during the nine months ended September 30, 2016 was approximately $0.4 million . As of September 30, 2016 , there was approximately $8.4 million of total unrecognized compensation cost related to nonvested share-based compensation arrangements. That cost is expected to be recognized over a weighted average period of approximately 2.0 years. The following table summarizes information about outstanding and vested stock options as of September 30, 2016 : Options Outstanding Options Exercisable Range of Exercise Prices Number of Shares Outstanding (in thousands) Weighted-Average Remaining Contractual Life (Years) Weighted-Average Exercise Price Number of Shares (in thousands) Weighted-Average Exercise Price $1.79 - $6.32 884 3.16 $ 4.46 717 $ 4.03 $6.54 - $9.20 898 6.29 7.42 529 7.44 $9.24 - $9.34 842 6.30 9.26 612 9.26 $9.44 - $10.09 729 7.91 9.90 451 9.89 $10.13 - $10.13 1,105 6.89 10.13 602 10.13 $10.31 - $12.32 921 6.02 11.21 676 11.47 $12.46 - $13.28 1,166 5.28 13.10 1,017 13.10 $13.34 - $16.98 1,286 6.58 15.22 905 15.89 $17.88 - $18.09 384 5.66 18.06 384 18.06 $18.24 - $18.24 5 5.83 18.24 5 18.24 8,220 6.02 $ 10.83 5,898 $ 11.11 Restricted Stock Unit Activity A summary of the Company’s restricted stock units (“RSUs”) activity and weighted average exercise prices follows: Restricted Stock Unit Activity Number of Shares (in thousands) Weighted Average Grant Date Fair Value (Per Share) Aggregate Fair Value (in thousands) Balance outstanding at December 31, 2015 1,202 $ 10.31 $ — Awarded 571 6.32 — Released (330 ) 10.31 — Forfeited (170 ) 10.26 — Non-vested and outstanding at September 30, 2016 1,273 $ 8.53 $ 10,699 Expected to vest 927 $ 8.90 $ 7,799 RSUs granted to employees generally vest over a four -year period. As of September 30, 2016 , total unrecognized compensation cost, adjusted for estimated forfeitures, related to nonvested RSUs was approximately $10.3 million and the weighted-average remaining vesting period was 3.0 years.

Restructuring

Restructuring	9 Months Ended
	Sep. 30, 2016
Restructuring and Related Activities [Abstract]
Restructuring	Restructuring The Company's restructuring costs relate to the termination and severance costs associated with a large customer contract, as well as re-prioritizing and reallocating resources to focus on areas showing high growth potential. There was a benefit of approximately $0.4 million due to the cash collection of a previously written off bad debt during the three and nine months ended September 30, 2016 , which is classified in the condensed consolidated statements of operations as restructuring costs. The expense associated with this restructuring was approximately $3.0 million during the nine months ended September 30, 2015 . The restructuring liability was approximately $1.5 million as of September 30, 2015 and is classified as accrued expenses and other current liabilities on the condensed consolidated balance sheets. The following table present the detail of expenses and liability for the Company's restructuring charges for the periods presented (amounts in thousands): Expense incurred during the nine months ended September 30, 2015 Liability as of September 30, 2015 Contract termination costs $ 1,745 $ 569 Severance and other associated costs 1,243 946 Total restructuring costs $ 2,988 $ 1,515

Legal Matters

Legal Matters	9 Months Ended
	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Legal Matters	Legal Matters The Company filed an intellectual property suit against [24]7 Customer, Inc. in the Southern District of New York on March 6, 2014 seeking damages on the grounds that [24]7 reverse engineered and misappropriated the Company's technology to develop competing products and misused the Company's business information. Discovery in the New York case is in process. On June 22, 2015, [24]7 Customer, Inc. filed suit against the Company in the Northern District of California alleging patent infringement. On December 7, 2015, [24]7 Customer Inc. filed a second patent infringement suit against the Company, also in the Northern District of California. On January 5, 2016, the two California cases were consolidated for all pre-trial purposes. The Company believes the claims filed by [24]7 Customer Inc. are without merit and intends to defend them vigorously. The Company routinely assesses all of its litigation and threatened litigation as to the probability of ultimately incurring a liability, and records its best estimate of the ultimate loss in situations where the Company assesses the likelihood of loss as probable. From time to time, the Company is involved in or subject to legal, administrative and regulatory proceedings, claims, demands and investigations arising in the ordinary course of business, including direct claims brought by or against the Company with respect to intellectual property, contracts, employment and other matters, as well as claims brought against the Company’s customers for whom the Company has a contractual indemnification obligation. The Company accrues for a liability when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. Significant judgment is required in both the determination of probability and the determination as to whether a loss is reasonably estimable. In addition, in the event the Company determines that a loss is not probable, but is reasonably possible, and it becomes possible to develop what the Company believes to be a reasonable range of possible loss, then the Company will include disclosure related to such matter as appropriate and in compliance with ASC 450. The accruals or estimates, if any, resulting from the foregoing analysis, are reviewed at least quarterly and adjusted to reflect the impact of negotiations, settlements, rulings, advice of legal counsel and other information and events pertaining to a particular matter. To the extent there is a reasonable possibility that the losses could exceed the amounts already accrued, the Company will, as applicable, adjust the accrual in the period the determination is made, disclose an estimate of the additional loss or range of loss, indicate that the estimate is immaterial with respect to its financial statements as a whole or, if the amount of such adjustment cannot be reasonably estimated, disclose that an estimate cannot be made. From time to time, third parties assert claims against the Company regarding intellectual property rights, privacy issues and other matters arising in the ordinary course of business. Although the Company cannot be certain of the outcome of any litigation or the disposition of any claims, nor the amount of damages and exposure, if any, that the Company could incur, the Company currently believes that the final disposition of all existing matters will not have a material adverse effect on our business, results of operations, financial condition or cash flows. In addition, in the ordinary course of business, the Company is also subject to periodic threats of lawsuits, investigations and claims. Regardless of the outcome, litigation can have an adverse impact on the Company because of defense and settlement costs, diversion of management resources and other factors.

Description of Business and B20

Description of Business and Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2016
Accounting Policies [Abstract]
Summary of Operations	LivePerson, Inc. (the “Company” or “LivePerson”) was incorporated in the State of Delaware in November 1995 and the LivePerson service was introduced in November 1998. In April 2000, the Company completed an initial public offering and is currently traded on the Nasdaq Global Select Market and the Tel Aviv Stock Exchange. LivePerson is headquartered in New York City, with U.S. offices in Alpharetta (Georgia) and international offices in Amsterdam, Berlin, London, Mannheim, Melbourne, Milan, Paris, Ra'anana (Israel), Reading (UK), and Tokyo. LivePerson provides mobile and online messaging technologies that power digital communication between brands and consumers. LiveEngage, the Company’s enterprise-class, cloud-based platform, enables businesses to create a meaningful connection with consumers by offering messaging as a preferred channel of communication. Messaging diminishes the need to rely on email systems or call a 1-800 number. Brands leverage LivePerson’s sophisticated intelligence engine and suite of text and mobile messaging, real-time chat messaging, content delivery, and co-browsing offerings to proactively engage with consumers through m-dot sites, mobile apps, the desktop, social media and third-party consumer messaging platforms. The Company’s campaign-based messaging enables the brand to target the right consumer at the right time on a brand’s site by leveraging proprietary analysis and data-driven intelligence. The data that the Company gathers and analyzes, on behalf of its customers, spans the breadth of an online or mobile visitor session, starting from an initial keyword search or application login, through actions on the website or mobile application of the Company’s customer, and even into a shopping cart and an executed sale. The Company combines this session data with other historical, behavioral and operational information to develop insights into each step of a consumer’s journey for sales and service transactions. These unique, industry- and use-case specific insights are mapped to each brand’s business goals in order to deliver successful campaign outcomes. LivePerson’s products, coupled with its domain knowledge, industry expertise and consulting services, have been proven to maximize the effectiveness of consumer engagement. The Company’s primary revenue source is from the sale of LivePerson services to businesses of all sizes. The Company also offers an online marketplace that connects independent service providers (“Experts”) who provide information and knowledge for a fee via mobile and online messaging with individual consumers (“Users”).
Basis of Presentation	Basis of Presentation The accompanying condensed consolidated financial statements as of September 30, 2016 and for the three and nine months ended September 30, 2016 and 2015 are unaudited. In the opinion of management, the unaudited condensed consolidated financial statements have been prepared on the same basis as the annual financial statements and reflect all adjustments, which include only normal recurring adjustments, necessary to present fairly the consolidated financial position of LivePerson as of September 30, 2016 , and the consolidated results of operations, comprehensive loss and cash flows for the interim periods ended September 30, 2016 and 2015 . The financial data and other information disclosed in these notes to the condensed consolidated financial statements related to these periods are unaudited. The results of operations for any interim period are not necessarily indicative of the results of operations for any other future interim period or for a full fiscal year. The condensed consolidated balance sheet at December 31, 2015 has been derived from audited consolidated financial statements at that date. Certain information and note disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). These unaudited interim condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto for the year ended December 31, 2015, included in the Company’s Annual Report on Form 10-K filed with the SEC on March 15, 2016.
Revenue Recognition	Revenue Recognition The majority of the Company’s revenue is generated from monthly service revenues and related professional services from the sale of the LivePerson services. Because the Company provides its application as a service, the Company follows the provisions of FASB Accounting Standards Codification (“ASC”) 605-10-S99, “Revenue Recognition” and ASC 605-25, “Revenue Recognition with Multiple-Element Arrangements.” The Company charges a monthly, quarterly or annual fee, which varies by type of service, the level of customer usage and website traffic, and in some cases, the number of orders placed via the Company’s online engagement solutions. For certain of the Company’s larger customers, the Company may provide call center labor through an arrangement with one or more of several qualified vendors. For most of these customers, the Company passes the fee it incurs with the labor provider and its fee for the hosted services through to its customers in the form of a fixed fee for each order placed via the Company’s online engagement solutions. For these Pay for Performance (“PFP”) arrangements, in accordance with ASC 605-45, “Principal Agent Considerations,” the Company records revenue for transactions in which it acts as an agent on a net basis, and revenue for transactions in which it acts as a principal on a gross basis. The Company also sells certain of the LivePerson services directly via Internet download. These services are marketed as LiveEngage for small to medium-sized businesses, and are paid for almost exclusively by credit card. Credit card payments accelerate cash flow and reduce the Company’s collection risk, subject to the merchant bank’s right to hold back cash pending settlement of the transactions. Sales of LiveEngage may occur with or without the assistance of an online sales representative, rather than through face-to-face or telephone contact that is typically required for traditional direct sales. The Company recognizes monthly service revenue based upon the fee charged for the LivePerson services, provided that there is persuasive evidence of an arrangement, no significant Company obligations remain, collection of the resulting receivable is probable and the amount of fees to be paid is fixed or determinable. The Company’s service agreements typically have twelve month terms and, in some cases, are terminable or may terminate upon 30 to 90 days’ notice without penalty. When professional service fees add value to the customer on a standalone basis, the Company recognizes professional service fees upon completion and customer acceptance. The Company establishes a selling price hierarchy for determining the selling price of a deliverable, which is based on: (a) vendor-specific objective evidence; (b) third-party evidence; or (c) best estimated selling price. If a professional services arrangement does not qualify for separate accounting, the Company recognizes the fees, and the related labor costs, ratably over the contracted period. For revenue from the Company’s Consumer segment generated from online transactions between Experts and Users, the Company recognizes revenue net of the Expert fees in accordance with ASC 605-45, “Principal Agent Considerations,” due primarily to the fact that the Expert is the primary obligor. Additionally, the Company performs as an agent without any risk of loss for collection, and is not involved in selecting the Expert or establishing the Expert’s fee. The Company collects a fee from the User and retains a portion of the fee, and then remits the balance to the Expert. Revenue from these transactions is recognized when there is persuasive evidence of an arrangement, no significant Company obligations remain, collection of the resulting receivable is probable and the amount of fees to be paid is fixed and determinable.
Net Income (Loss) Per Share	Net Income (Loss) Per Share The Company calculates earnings per share (“EPS”) in accordance with the provisions of ASC 260-10 and the guidance of SEC Staff Accounting Bulletin (“SAB”) No. 98. Under ASC 260-10, basic EPS excludes dilution for common stock equivalents and is computed by dividing net income or loss attributable to common shareholders by the weighted average number of common shares outstanding for the period. All options, warrants or other potentially dilutive instruments issued for nominal consideration are required to be included in the calculation of basic and diluted net income attributable to common stockholders. Diluted EPS is calculated using the treasury stock method and reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock and resulted in the issuance of common stock. Diluted net loss per common share for the three and nine months ended September 30, 2016 does not include the effect of 9,492,949 outstanding common stock awards, as the effect of their inclusion is anti-dilutive. Diluted net loss per common share for the three months ended September 30, 2015 includes the effect of options to purchase 1,429,142 shares of outstanding common stock with a weighted average exercise price of $9.02 . Diluted net loss per common share for the three months ended September 30, 2015 does not include the effect of 8,140,127 outstanding common stock awards, as the effect of their inclusion is anti-dilutive. Diluted net loss per common share for the nine months ended September 30, 2015 does not include the effect of 9,569,269 outstanding common stock awards, as the effect of their inclusion is anti-dilutive. A reconciliation of shares used in calculating basic and diluted net loss per share follows: Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Basic 56,047,645 56,525,647 56,131,818 56,437,198 Effect of assumed exercised options — 558,790 — — Diluted 56,047,645 57,084,437 56,131,818 56,437,198
Segment Information	Segment Information The Company accounts for its segment information in accordance with the provisions of ASC 280-10, “Segment Reporting.” ASC 280-10 establishes annual and interim reporting standards for operating segments of a company. ASC 280-10 requires disclosures of selected segment-related financial information about products, major customers, and geographic areas based on the Company’s internal accounting methods. The Company is organized into two operating segments for purposes of making operating decisions and assessing performance. The Business segment facilitates real-time online interactions – chat, voice and content delivery across multiple channels and screens for global corporations of all sizes. The Consumer segment facilitates online transactions between Experts and Users and sells its services to consumers. Both segments currently generate their revenue primarily in the United States. The chief operating decision maker, who is the chief executive officer, evaluates performance, makes operating decisions, and allocates resources based on the operating income of each segment. The reporting segments follow the same accounting polices used in the preparation of the Company’s condensed consolidated financial statements which are described in the summary of significant accounting policies. The Company allocates cost of revenue, sales and marketing and amortization of purchased intangibles to the segments, but it does not allocate product development expenses, general and administrative expenses, restructuring costs and income tax expense because management does not use this information to measure performance of the operating segments. There are currently no inter-segment sales.
Goodwill and Intangible Assets	Amortization expense is calculated over the estimated useful life of the asset.
Stock-Based Compensation	gram. Stock-Based Compensation The Company follows FASB ASC 718-10, “Stock Compensation,” which addresses the accounting for transactions in which an entity exchanges its equity instruments for goods or services, with a primary focus on transactions in which an entity obtains employee services in share-based payment transactions. ASC 718-10 requires measurement of the cost of employee services received in exchange for an award of equity instruments based on the grant-date fair value of the award (with limited exceptions). Incremental compensation costs arising from subsequent modifications of awards after the grant date must be reco

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Reconciliation of Shares Used in Calculating Basic and Diluted Earnings Per Share	A reconciliation of shares used in calculating basic and diluted net loss per share follows: Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Basic 56,047,645 56,525,647 56,131,818 56,437,198 Effect of assumed exercised options — 558,790 — — Diluted 56,047,645 57,084,437 56,131,818 56,437,198

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Summary of Financial Information by Segment	Summarized financial information by segment for the three months ended September 30, 2016 , based on the Company’s internal financial reporting system utilized by the Company’s chief operating decision maker, follows (amounts in thousands): Business Consumer Corporate Consolidated Revenue: Hosted services – Business $ 44,553 $ — $ — $ 44,553 Hosted services – Consumer — 4,044 — 4,044 Professional services 5,921 — — 5,921 Total revenue 50,474 4,044 — 54,518 Cost of revenue 14,215 622 — 14,837 Sales and marketing 20,278 1,789 — 22,067 Amortization of purchased intangibles 1,013 — — 1,013 Unallocated corporate expenses — — 19,180 19,180 Operating income (loss) $ 14,968 $ 1,633 $ (19,180 ) $ (2,579 ) Summarized financial information by segment for the three months ended September 30, 2015 , based on the Company’s internal financial reporting system utilized by the Company’s chief operating decision maker, follows (amounts in thousands): Business Consumer Corporate Consolidated Revenue: Hosted services – Business $ 50,957 $ — $ — $ 50,957 Hosted services – Consumer — 3,661 — 3,661 Professional services 6,139 — — 6,139 Total revenue 57,096 3,661 — 60,757 Cost of revenue 17,652 573 — 18,225 Sales and marketing 21,333 1,953 — 23,286 Amortization of purchased intangibles 1,193 — — 1,193 Unallocated corporate expenses — — 16,154 16,154 Operating income (loss) $ 16,918 $ 1,135 $ (16,154 ) $ 1,899 Summarized financial information by segment for the nine months ended September 30, 2016 , based on the Company’s internal financial reporting system utilized by the Company’s chief operating decision maker, follows (amounts in thousands): Business Consumer Corporate Consolidated Revenue: Hosted services – Business $ 137,240 $ — $ — $ 137,240 Hosted services – Consumer — 12,048 — 12,048 Professional services 17,374 — — 17,374 Total revenue 154,614 12,048 — 166,662 Cost of revenue 46,145 2,065 — 48,210 Sales and marketing 62,606 5,225 — 67,831 Amortization of purchased intangibles 2,954 — — 2,954 Unallocated corporate expenses — — 58,802 58,802 Operating income (loss) $ 42,909 $ 4,758 $ (58,802 ) $ (11,135 ) Summarized financial information by segment for the nine months ended September 30, 2015 , based on the Company’s internal financial reporting system utilized by the Company’s chief operating decision maker, follows (amounts in thousands): Business Consumer Corporate Consolidated Revenue: Hosted services – Business $ 151,767 $ — $ — $ 151,767 Hosted services – Consumer — 11,219 — 11,219 Professional services 16,875 — — 16,875 Total revenue 168,642 11,219 — 179,861 Cost of revenue 50,752 1,779 — 52,531 Sales and marketing 66,865 5,097 — 71,962 Amortization of purchased intangibles 3,683 — — 3,683 Unallocated corporate expenses — — 59,522 59,522 Operating income (loss) $ 47,342 $ 4,343 $ (59,522 ) $ (7,837 )
Revenues Attributable to Domestic and Foreign Operations	The following table presents the Company’s revenues attributable to domestic and foreign operations for the periods presented (amounts in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 United States $ 35,114 $ 39,972 $ 111,177 $ 120,409 Other Americas (1) 2,073 3,589 5,165 9,437 Total Americas 37,187 43,561 116,342 129,846 EMEA (2) (4) 12,588 13,237 36,468 38,443 APAC (3) 4,743 3,959 13,852 11,572 Total revenue $ 54,518 $ 60,757 $ 166,662 $ 179,861 (1) Canada, Latin America and South America (2) Europe, the Middle East and Africa (“EMEA”) (3) Asia-Pacific (“APAC”) (4) Includes revenues from the United Kingdom of $8.9 million and $25.7 million for the three and nine months ended September 30, 2016, respectively. For the three and nine months ended September 30, 2015, revenues from the United Kingdom were $9.8 million and $28.1 million , respectively.
Long-Lived Assets by Geographic Region	The following table presents the Company’s long-lived assets by geographic region for the periods presented (amounts in thousands): September 30, December 31, 2016 2015 United States $ 94,716 $ 96,362 Israel 14,589 16,393 Australia 9,161 8,290 Netherlands 7,358 8,285 Other (1) 2,181 2,482 Total long-lived assets $ 128,005 $ 131,812
Long Lived Assets By Geographic Region	The following table presents the Company’s long-lived assets by geographic region for the periods presented (amounts in thousands): September 30, December 31, 2016 2015 United States $ 94,716 $ 96,362 Israel 14,589 16,393 Australia 9,161 8,290 Netherlands 7,358 8,285 Other (1) 2,181 2,482 Total long-lived assets $ 128,005 $ 131,812 (1) United Kingdom, Germany, Japan, France and Italy

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The changes in the carrying amount of goodwill for the nine months ended September 30, 2016 are as follows (amounts in thousands): Business Consumer Consolidated Balance as of December 31, 2015 $ 72,298 $ 8,024 $ 80,322 Adjustments to goodwill: Foreign exchange adjustment 59 — 59 Balance as of September 30, 2016 $ 72,357 $ 8,024 $ 80,381
Summary of Intangible Assets	Intangible assets are summarized as follows (see Note 8) (amounts in thousands): As of September 30, 2016 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Amortization Period Amortizing intangible assets: Technology $ 28,059 $ (18,777 ) $ 9,282 4.7 years Customer relationships 16,018 (8,359 ) 7,659 5.8 years Trade names 1,298 (1,275 ) 23 2.6 years Non-compete agreements 1,448 (1,149 ) 299 1.7 years Patents 3,851 (1,129 ) 2,722 10.4 years Other 262 (235 ) 27 3.0 years Total $ 50,936 $ (30,924 ) $ 20,012 As of December 31, 2015 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Amortization Period Amortizing intangible assets: Technology $ 28,005 $ (15,723 ) $ 12,282 4.7 years Customer relationships 16,008 (6,873 ) 9,135 5.8 years Trade names 1,287 (1,250 ) 37 2.6 years Non-compete agreements 1,446 (936 ) 510 1.7 years Patents 3,440 (848 ) 2,592 9.3 years Other 312 (249 ) 63 3.0 years Total $ 50,498 $ (25,879 ) $ 24,619
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	Estimated amortization expense for the next five years is as follows (amounts in thousands): Estimated Amortization Expense 2016 $ 1,634 2017 4,933 2018 2,834 2019 2,620 2020 2,425 Thereafter 5,566 Total $ 20,012

Property and Equipment (Tables)

Property and Equipment (Tables)	9 Months Ended
	Sep. 30, 2016
Property, Plant and Equipment [Abstract]
Summary of Property and Equipment	The following table presents the detail of property and equipment for the periods presented (amounts in thousands): September 30, December 31, Computer equipment and software $ 76,838 $ 67,631 Furniture, equipment and building improvements 13,981 13,761 90,819 81,392 Less: accumulated depreciation (66,708 ) (57,263 ) Total $ 24,111 $ 24,129

Accrued Liabilities (Tables)

Accrued Liabilities (Tables)	9 Months Ended
	Sep. 30, 2016
Payables and Accruals [Abstract]
Accrued Liabilities	The following table presents the detail of accrued expenses and other current liabilities for the periods presented (amounts in thousands): September 30, December 31, Payroll and other employee related costs $ 14,935 $ 14,107 Professional services and consulting and other vendor fees 11,068 12,372 Sales commissions 2,466 4,522 Contingent earnout (see Notes 8 and 9) 210 377 Other 3,922 2,918 Total $ 32,601 $ 34,296

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring Basis	The Company ’ s assets and liabilities that are measured at fair value on a recurring basis, by level, within the fair value hierarchy as of September 30, 2016 and December 31, 2015 , are summarized as follows (amounts in thousands). The Company’s restricted cash balance of $4.0 million at September 30, 2016 and $5.4 million at December 31, 2015 is not held in a money market account and is not included in the following table. September 30, 2016 December 31, 2015 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets: Cash equivalents: Money market funds $ 3,073 $ — $ — $ 3,073 $ 4,059 $ — $ — $ 4,059 Foreign currency derivative contracts — 965 — 965 — 102 — 102 Total assets $ 3,073 $ 965 $ — $ 4,038 $ 4,059 $ 102 $ — $ 4,161 Liabilities: Contingent earn-outs $ — $ — $ 210 $ 210 $ — $ — $ 377 $ 377 Foreign currency derivative contracts — 3 — 3 — 310 — 310 Total liabilities $ — $ 3 $ 210 $ 213 $ — $ 310 $ 377 $ 687
Change in Fair Value of Level 3 Liabilities	The changes in fair value of the Level 3 liabilities are as follows (amounts in thousands): Contingent Earn-Out September 30, 2016 December 31, 2015 Balance, Beginning of Period $ 377 $ 6,940 Cash payments (167 ) (2,883 ) Changes in fair value — (3,680 ) Balance, End of Period $ 210 $ 377
Schedule of Derivative Instruments	The following summarizes certain information regarding the Company’s outstanding foreign currency derivative contracts related primarily to intercompany receivables and payables for the periods presented (in thousands): As of September 30, 2016 As of December 31, 2015 Notional amount of foreign currency derivative contracts $ 36,658 $ 43,431 Fair value of foreign currency derivatives contracts $ 962 $ (208 )
Schedule of Derivative Liabilities at Fair Value	The fair value of the Company’s derivative instruments is summarized below (in thousands): Fair Value of Derivative Instruments Balance Sheet Location As of September 30, 2016 As of December 31, 2015 Derivative Assets Derivatives not designated as hedging instruments: Foreign currency derivatives contracts Prepaid expenses and other current assets $ 965 $ 102 Derivative Liabilities Derivatives not designated as hedging instruments: Foreign currency derivatives contracts Accrued expenses and other liabilities $ 3 $ 310
Gain (Losses) on Derivative Instruments Recognized in Income Statement	The following summarizes certain information regarding the Company’s derivatives that are not designated or are not effective as hedges (in thousands): Gain (losses) on Derivative Instruments Recognized in Statements of Operations Three Months Ended September 30, Nine Months Ended September 30, Location 2016 2015 2016 2015 Foreign currency derivatives contracts Other expense $ 44 $ (85 ) $ 132 $ (52 )

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Weighted Average Assumptions of Fair Value Options Using Black-Scholes Option-Pricing Model	The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions: Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Dividend yield 0.0% 0.0% 0.0% 0.0% Risk-free interest rate 1.1% 1.7% 1.0% - 1.4% 1.3% - 1.7% Expected life (in years) 5 5 5 5 Historical volatility 47.9% 47.4% 47.3% - 48.2% 47.4% - 49.7%
Summary of Stock Option Activity and Weighted Average Exercise Prices	A summary of the Company’s stock option activity and weighted average exercise prices follows: Stock Option Activity Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) Options (in thousands) Weighted Average Exercise Price Balance outstanding at December 31, 2015 9,139 $ 11.05 Granted 473 6.92 Exercised (115 ) 5.54 Cancelled or expired (1,277 ) 11.42 Balance outstanding at September 30, 2016 8,220 $ 10.83 6.02 $ 4,452 Options vested and expected to vest 7,761 $ 10.92 5.86 $ 4,169 Options exercisable at September 30, 2016 5,898 $ 11.11 5.19 $ 3,724
Summary of Status of Nonvested Shares	A summary of the Company’s stock option activity and weighted average exercise prices follows: Stock Option Activity Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) Options (in thousands) Weighted Average Exercise Price Balance outstanding at December 31, 2015 9,139 $ 11.05 Granted 473 6.92 Exercised (115 ) 5.54 Cancelled or expired (1,277 ) 11.42 Balance outstanding at September 30, 2016 8,220 $ 10.83 6.02 $ 4,452 Options vested and expected to vest 7,761 $ 10.92 5.86 $ 4,169 Options exercisable at September 30, 2016 5,898 $ 11.11 5.19 $ 3,724
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range	The following table summarizes information about outstanding and vested stock options as of September 30, 2016 : Options Outstanding Options Exercisable Range of Exercise Prices Number of Shares Outstanding (in thousands) Weighted-Average Remaining Contractual Life (Years) Weighted-Average Exercise Price Number of Shares (in thousands) Weighted-Average Exercise Price $1.79 - $6.32 884 3.16 $ 4.46 717 $ 4.03 $6.54 - $9.20 898 6.29 7.42 529 7.44 $9.24 - $9.34 842 6.30 9.26 612 9.26 $9.44 - $10.09 729 7.91 9.90 451 9.89 $10.13 - $10.13 1,105 6.89 10.13 602 10.13 $10.31 - $12.32 921 6.02 11.21 676 11.47 $12.46 - $13.28 1,166 5.28 13.10 1,017 13.10 $13.34 - $16.98 1,286 6.58 15.22 905 15.89 $17.88 - $18.09 384 5.66 18.06 384 18.06 $18.24 - $18.24 5 5.83 18.24 5 18.24 8,220 6.02 $ 10.83 5,898 $ 11.11
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity	A summary of the Company’s restricted stock units (“RSUs”) activity and weighted average exercise prices follows: Restricted Stock Unit Activity Number of Shares (in thousands) Weighted Average Grant Date Fair Value (Per Share) Aggregate Fair Value (in thousands) Balance outstanding at December 31, 2015 1,202 $ 10.31 $ — Awarded 571 6.32 — Released (330 ) 10.31 — Forfeited (170 ) 10.26 — Non-vested and outstanding at September 30, 2016 1,273 $ 8.53 $ 10,699 Expected to vest 927 $ 8.90 $ 7,799

Restructuring (Tables)

Restructuring (Tables)	9 Months Ended
	Sep. 30, 2016
Restructuring and Related Activities [Abstract]
Restructuring and Related Costs	The following table present the detail of expenses and liability for the Company's restructuring charges for the periods presented (amounts in thousands): Expense incurred during the nine months ended September 30, 2015 Liability as of September 30, 2015 Contract termination costs $ 1,745 $ 569 Severance and other associated costs 1,243 946 Total restructuring costs $ 2,988 $ 1,515

Description of Business and B29

Description of Business and Basis of Presentation (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
Business Acquisition [Line Items]
Changes in fair value		$ 0	$ (3,792)
General and administrative expense [Member] | Contact At Once! and Engage [Member]
Business Acquisition [Line Items]
Changes in fair value	$ (1,300)	(1,500)
Cost of revenue [Member] | Contact At Once! and Engage [Member]
Business Acquisition [Line Items]
Changes in fair value	$ 1,300	$ 1,500

Revenue Recognition (Details)

Revenue Recognition (Details)	9 Months Ended
	Sep. 30, 2016
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Typical service agreements	12 months
Minimum [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Typical service agreements termination notice period	30 days
Maximum [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Typical service agreements termination notice period	90 days

Net Income (Loss) Per Share (Na

Net Income (Loss) Per Share (Narrative) (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Effect of option to purchase share of common stock on diluted net income per share	9,492,949	8,140,127	9,492,949,000	9,569,269
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements		1,429,142
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements		$ 9.02

Net Income (Loss) Per Share (Re

Net Income (Loss) Per Share (Reconciliation of Shares Used in Calculating Basic and Diluted Earnings Per Share) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Basic	56,047,645	56,525,647	56,131,818	56,437,198
Effect of assumed exercised options	0	558,790	0	0
Diluted	56,047,645	57,084,437	56,131,818	56,437,198

Segment Information (Narrative)

Segment Information (Narrative) (Details)	9 Months Ended
	Sep. 30, 2016segment
Segment Reporting [Abstract]
Number of operating segments	2

Segment Information (Summary of

Segment Information (Summary of Financial Information by Segment) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue
Hosted services – Business		$ 44,553	$ 50,957	$ 137,240	$ 151,767
Hosted services – Consumer		4,044	3,661	12,048	11,219
Professional services		5,921	6,139	17,374	16,875
Revenue		54,518	60,757	166,662	179,861
Cost of revenue	[1],[2],[3],[4]	14,837	18,225	48,210	52,531
Sales and marketing	[2],[3]	22,067	23,286	67,831	71,962
Amortization of purchased intangibles	[2],[3]	1,013	1,193	2,954	3,683
Unallocated corporate expenses		19,180	16,154	58,802	59,522
Operating income (loss)		(2,579)	1,899	(11,135)	(7,837)
Corporate [Member]
Revenue
Unallocated corporate expenses		19,180	16,154	58,802	59,522
Operating income (loss)		(19,180)	(16,154)	(58,802)	(59,522)
Business [Member]
Revenue
Hosted services – Business		44,553	50,957	137,240	151,767
Professional services		5,921	6,139	17,374	16,875
Revenue		50,474	57,096	154,614	168,642
Cost of revenue		14,215	17,652	46,145	50,752
Sales and marketing		20,278	21,333	62,606	66,865
Amortization of purchased intangibles		1,013	1,193	2,954	3,683
Operating income (loss)		14,968	16,918	42,909	47,342
Consumer [Member]
Revenue
Hosted services – Consumer		4,044	3,661	12,048	11,219
Revenue		4,044	3,661	12,048	11,219
Cost of revenue		622	573	2,065	1,779
Sales and marketing		1,789	1,953	5,225	5,097
Operating income (loss)		$ 1,633	$ 1,135	$ 4,758	$ 4,343
[1]	Amounts include amortization expense as follows: Cost of revenue $697 thousand and $760 thousand for the three months ended September 30, 2016 and 2015, respectively.Amounts include amortization expense as follows: Cost of revenue $2,091 thousand and $2,439 thousand for the three months ended September 30, 2016 and 2015, respectively.
[2]	Amounts include depreciation expense as follows: Cost of revenue $1,756 thousand and $2,266 thousand for the three months ended September 30, 2016 and 2015, respectively, Sales and marketing $212 thousand and $254 thousand for the three months ended September 30, 2016 and 2015, respectively, General and administrative $435 thousand and $190 thousand for the three months ended September 30, 2016 and 2015, respectively, and Product development $247 thousand and $229 thousand for the three months ended September 30, 2016 and 2015, respectively. Amounts include depreciation expense as follows: Cost of revenue $6,469 thousand and $6,491 thousand for the three months ended September 30, 2016 and 2015, respectively, Sales and marketing $1,012 thousand and $819 thousand for the three months ended September 30, 2016 and 2015, respectively, General and administrative $1,215 thousand and $663 thousand for the three months ended September 30, 2016 and 2015, respectively, and Product development $749 thousand and $626 thousand for the three months ended September 30, 2016 and 2015, respectively.
[3]	Amounts include stock compensation expense as follows: Cost of revenue $121 thousand and $288 thousand for the three months ended September 30, 2016 and 2015, respectively, Sales and marketing $502 thousand and $760 thousand for the three months ended September 30, 2016 and 2015, respectively, General and administrative $759 thousand and $911 thousand for the three months ended September 30, 2016 and 2015, respectively and Product development $873 thousand and $927 thousand for the three months ended September 30, 2016 and 2015, respectively. Amounts include stock compensation expense as follows: Cost of revenue $342 thousand and $1,092 thousand for thenine months ended September 30, 2016 and 2015, respectively, Sales and marketing $1,936 thousand and $2,292 thousand for the nine months ended September 30, 2016 and 2015, respectively, General and administrative $2,552 thousand and $2,590 thousand for the nine months ended September 30, 2016 and 2015, respectively and Product development $2,770 thousand and $2,819 thousand for the nine months ended September 30, 2016 and 2015, respectively.
[4]	The Company reclassified $1.3 million and $1.5 million in the three and nine months ended September 30, 2016, respectively, related to the fair value adjustment of the contingent earn-out for CAO! and Engage from cost of revenue to general and administrative expenses to conform to the full year presentation.

Segment Information (Revenues A

Segment Information (Revenues Attributable to Domestic and Foreign Operations) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Revenue		$ 54,518	$ 60,757	$ 166,662	$ 179,861
United States [Member]
Segment Reporting Information [Line Items]
Revenue		35,114	39,972	111,177	120,409
Other Americas [Member]
Segment Reporting Information [Line Items]
Revenue	[1]	2,073	3,589	5,165	9,437
Americas [Member]
Segment Reporting Information [Line Items]
Revenue		37,187	43,561	116,342	129,846
EMEA [Member]
Segment Reporting Information [Line Items]
Revenue	[2],[3]	12,588	13,237	36,468	38,443
APAC [Member]
Segment Reporting Information [Line Items]
Revenue	[4]	4,743	3,959	13,852	11,572
United Kingdom [Member]
Segment Reporting Information [Line Items]
Revenue	[2]	$ 8,900	$ 9,800	$ 25,700	$ 28,100
[1]	Canada, Latin America and South America
[2]	Europe, the Middle East and Africa (“EMEA”)
[3]	Includes revenues from the United Kingdom of $8.9 million and $25.7 million for the three and nine months ended September 30, 2016, respectively. For the three and nine months ended September 30, 2015, revenues from the United Kingdom were $9.8 million and $28.1 million, respectively.
[4]	Asia-Pacific (“APAC”)

Segment Information (Long-Lived

Segment Information (Long-Lived Assets by Geographic Region) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total long-lived assets	$ 128,005	$ 131,812
United States [Member]
Segment Reporting Information [Line Items]
Total long-lived assets	94,716	96,362
Israel [Member]
Segment Reporting Information [Line Items]
Total long-lived assets	14,589	16,393
Australia [Member]
Segment Reporting Information [Line Items]
Total long-lived assets	9,161	8,290
Netherlands [Member]
Segment Reporting Information [Line Items]
Total long-lived assets	7,358	8,285
Other [Member]
Segment Reporting Information [Line Items]
Total long-lived assets	$ 2,181	$ 2,482

Goodwill and Intangible Asset37

Goodwill and Intangible Assets (Changes in Carrying Amount of Goodwill) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)
Goodwill [Line Items]
Beginning Balance	$ 80,322
Ending Balance	80,381
Business [Member]
Goodwill [Line Items]
Beginning Balance	72,298
Ending Balance	72,357
Consumer [Member]
Goodwill [Line Items]
Beginning Balance	8,024
Ending Balance	8,024
Synchronite, LLC [Member]
Goodwill [Line Items]
Foreign exchange adjustment	59
Synchronite, LLC [Member] | Business [Member]
Goodwill [Line Items]
Foreign exchange adjustment	$ 59

Goodwill and Intangible Asset38

Goodwill and Intangible Assets (Summary of Intangible Assets) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 50,936	$ 50,498
Accumulated Amortization	(30,924)	(25,879)
Net Carrying Amount	20,012	24,619
Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	28,059	28,005
Accumulated Amortization	(18,777)	(15,723)
Net Carrying Amount	$ 9,282	$ 12,282
Weighted Average Amortization Period	4 years 8 months 18 days	4 years 8 months 18 days
Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 16,018	$ 16,008
Accumulated Amortization	(8,359)	(6,873)
Net Carrying Amount	$ 7,659	$ 9,135
Weighted Average Amortization Period	5 years 9 months 18 days	5 years 9 months 18 days
Trade names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,298	$ 1,287
Accumulated Amortization	(1,275)	(1,250)
Net Carrying Amount	$ 23	$ 37
Weighted Average Amortization Period	2 years 7 months 12 days	2 years 7 months 12 days
Non-compete agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,448	$ 1,446
Accumulated Amortization	(1,149)	(936)
Net Carrying Amount	$ 299	$ 510
Weighted Average Amortization Period	1 year 8 months 12 days	1 year 8 months 12 days
Patents [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,851	$ 3,440
Accumulated Amortization	(1,129)	(848)
Net Carrying Amount	$ 2,722	$ 2,592
Weighted Average Amortization Period	10 years 4 months 18 days	9 years 3 months 15 days
Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 262	$ 312
Accumulated Amortization	(235)	(249)
Net Carrying Amount	$ 27	$ 63
Weighted Average Amortization Period	3 years	3 years

Goodwill and Intangible Asset39

Goodwill and Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Aggregate amortization expense for intangible assets	$ 1,700	$ 2,000	$ 5,045	$ 6,122

Goodwill and Intangible Asset40

Goodwill and Intangible Assets (Future Amortization Expense) (Details) $ in Thousands	Sep. 30, 2016USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,016	$ 1,634
2,017	4,933
2,018	2,834
2,019	2,620
2,020	2,425
Thereafter	5,566
Total	$ 20,012

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 90,819	$ 90,819	$ 81,392
Less: accumulated depreciation	66,708	66,708	57,263
Total	24,111	24,111	24,129
Decrease to depreciation expense	400	400
Decrease to net loss	$ (400)	$ (400)
Basic net (loss) income per common share (in dollars per share)	$ (0.01)	$ (0.01)
Diluted net (loss) income per common share (in dollars per share)	$ (0.01)	$ (0.01)
Computer Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 76,838	$ 76,838	67,631
Furniture, Equipment and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 13,981	$ 13,981	$ 13,761

Accrued Liabilities (Details)

Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Payroll and other employee related costs	$ 14,935	$ 14,107
Professional services and consulting and other vendor fees	11,068	12,372
Sales commissions	2,466	4,522
Contingent earnout (see Notes 8 and 9)	210	377
Other	3,922	2,918
Total	$ 32,601	$ 34,296

Acquisitions (Details)

Acquisitions (Details) - USD ($) $ in Thousands	Nov. 08, 2014	Nov. 07, 2014	Jun. 02, 2014	Nov. 09, 2012	Jun. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2012
Business Acquisition [Line Items]
Change in fair value of contingent consideration						$ 0	$ 3,792
Goodwill						80,381		$ 80,322
Engage Pty Limited [Member]
Business Acquisition [Line Items]
Business acquisition, acquisition date				Nov. 9, 2012
Total consideration transferred				$ 10,600
Acquisition costs incurred to acquire entity									$ 500
Assets acquired liabilities assumed, net				800
Potential earn-out consideration				$ 1,700
Change in fair value of contingent consideration					$ 700
Synchronite, LLC [Member]
Business Acquisition [Line Items]
Business acquisition, acquisition date			Jun. 2, 2014
Total consideration transferred			$ 4,100
Acquisition costs incurred to acquire entity			400
Assets acquired liabilities assumed, net			45
Potential earn-out consideration			1,800			200
Goodwill			2,700
Intangible assets			$ 1,500
Payments for previous acquisition								1,600
Contact At Once! [Member]
Business Acquisition [Line Items]
Business acquisition, acquisition date		Nov. 7, 2014
Total consideration transferred	$ 67,000
Potential earn-out consideration		$ 4,200
Change in fair value of contingent consideration								$ 3,200
Goodwill		45,100
Intangible assets		20,400
Payments for previous acquisition						$ 200
Cash payment		42,800
Consideration transferred (in shares)		$ 20,000

Fair Value Measurements - Finan

Fair Value Measurements - Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Restricted cash balance	$ 3,966	$ 5,409
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	4,038	4,161
Liabilities	213	687
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	3,073	4,059
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	965	102
Liabilities	3	310
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	210	377
Recurring [Member] | Contingent Earn-Out [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	210	377
Recurring [Member] | Contingent Earn-Out [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	210	377
Recurring [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	3,073	4,059
Recurring [Member] | Money Market Funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	3,073	4,059
Recurring [Member] | Foreign currency derivative contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	965	102
Liabilities	3	310
Recurring [Member] | Foreign currency derivative contracts [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	965	102
Liabilities	$ 3	$ 310

Fair Value Measurements - Level

Fair Value Measurements - Level 3 Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Business Combination, Contingent Consideration Arrangements, Change In Contingent Consideration Liability [Roll Forward]
Changes in fair value	$ 0	$ (3,792)
Recurring [Member] | Level 3 [Member]
Business Combination, Contingent Consideration Arrangements, Change In Contingent Consideration Liability [Roll Forward]
Balance, Beginning of Period	377	$ 6,940	$ 6,940
Cash payments	(167)		(2,883)
Changes in fair value	0		(3,680)
Balance, End of Period	$ 210		$ 377

Fair Value Measurements - Deriv

Fair Value Measurements - Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Derivative [Line Items]
Cash held as collateral	$ 3,966		$ 3,966		$ 5,409
Foreign Currency Derivatives Contracts [Member]
Derivative [Line Items]
Notional amount	36,658		36,658		43,431
Fair value	962		962		(208)
Foreign Currency Derivatives Contracts [Member] | Other Expense [Member]
Derivative [Line Items]
Gain (losses) on Derivative Instruments Recognized in Statements of Operations	44	$ (85)	132	$ (52)
Foreign Currency Derivatives Contracts [Member] | Not Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivative [Line Items]
Derivative assets	965		965		102
Foreign Currency Derivatives Contracts [Member] | Not Designated as Hedging Instrument [Member] | Accrued Expenses And Other Liabilities [Member]
Derivative [Line Items]
Derivative liabilities	$ 3		$ 3		$ 310

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Rental expense for operating leases	$ 2,400,000	$ 2,400,000	$ 7,600,000	$ 5,900,000
Defined benefit plan employer matching contribution on first five percent of employee compensation			50.00%
Percentage of employees' eligible compensation for employer matching contribution			5.00%
Defined benefit plan employer contribution limit			$ 6,000
Defined benefit plan employer contribution vesting period			5 years
Defined benefit plan employer contribution	300,000	$ 300,000	$ 1,000,000	$ 1,000,000
Letter Of Credit For Office Space [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Letter of credit outstanding	1,900,000		1,900,000
Letter Of Credit For Security Deposit [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Letter of credit outstanding	$ 100,000		$ 100,000

Stockholders' Equity (Narrative

Stockholders' Equity (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Feb. 02, 2016	Jul. 23, 2014	Mar. 13, 2014	Dec. 10, 2012	Jun. 30, 2010
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common stock, shares authorized	100,000,000		100,000,000		100,000,000
Common stock, shares issued (in shares)	57,919,090		57,919,090		57,374,907
Common stock, shares outstanding (in shares)	57,919,090		57,919,090		57,374,907
Common stock, par value (in dollars per share)	$ 0.001		$ 0.001		$ 0.001
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock, shares authorized	5,000,000		5,000,000		5,000,000
Preferred stock, shares issued (in shares)	0		0		0
Preferred stock, shares outstanding (in shares)	0		0		0
Preferred stock, par value (in dollars per share)	$ 0.001		$ 0.001		$ 0.001
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased (in shares)	1,027,349		1,027,349
Per share weighed average fair value of stock options granted during the period (in dollars per share)	$ 3.11	$ 4.10	$ 2.94	$ 4.47
Dividend yield	0.00%	0.00%	0.00%	0.00%
Expected life	5 years	5 years	5 years	5 years
Period used to determine volatility			5 years
Stock option term			10 years
Total value of stock options exercised			$ 400,000
Incentive Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested share-based compensation arrangements	$ 8,400,000		$ 8,400,000
Weighted average recognition period of unrecognized compensation cost			1 year 11 months 23 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested share-based compensation arrangements	$ 10,300,000		$ 10,300,000
Weighted average recognition period of unrecognized compensation cost			3 years 11 days
Vesting period					4 years
1998 Plan [Member] | Incentive Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock available for issuance (up to)	5,850,000		5,850,000
2000 Plan [Member] | Incentive Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in number of shares of common stock available for issuance			4,150,000
1998 and 2000 Plan [Member] | Incentive Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock available for issuance (up to)	10,000,000		10,000,000
2009 Plan [Member] | Incentive Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock available for issuance (up to)	2,014,000		2,014,000
Increase in number of shares of common stock available for issuance			6,000,000
2010 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock available for issuance (up to)	239,000		239,000							1,000,000
2009 Plan [Member] | 2009 Plan [Member] | Incentive Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock available for issuance (up to)	23,817,744		23,817,744
Increase in number of shares of common stock available for issuance			4,250,000
2012 Stock Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount						$ 14,000,000	$ 50,000,000	$ 40,000,000	$ 30,000,000
Stock repurchase program, remaining authorized repurchase amount	$ 14,300,000		$ 14,300,000

Stockholders' Equity (Weighted

Stockholders' Equity (Weighted Average Assumptions of Fair Value Options Using Black-Scholes Option-Pricing Model) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%	0.00%	0.00%	0.00%
Risk-free interest rate	1.10%			1.70%
Expected life	5 years	5 years	5 years	5 years
Historical volatility	47.90%			47.40%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate		1.00%		1.30%
Historical volatility		4730000.00%		4740000.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate		1.40%		1.70%
Historical volatility		4820000.00%		4970000.00%

Stockholders' Equity (Summary o

Stockholders' Equity (Summary of Stock Option Activity and Weighted Average Exercise Prices) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)$ / sharesshares
Options
Options outstanding, beginning balance (in shares) | shares	9,139
Options granted (in shares) | shares	473
Options exercised (in shares) | shares	(115)
Options cancelled or expired (in shares) | shares	(1,277)
Options outstanding, ending balance (in shares) | shares	8,220
Options vested and expected to vest (in shares) | shares	7,761
Options exercisable at September 30, 2016 (in shares) | shares	5,898
Weighted Average Exercise Price
Options outstanding, beginning balance (in dollars per share) | $ / shares	$ 11.05
Options granted (in dollars per share) | $ / shares	6.92
Options exercised (in dollars per share) | $ / shares	5.54
Options cancelled or expired (in dollars per share) | $ / shares	11.42
Options outstanding, ending balance (in dollars per share) | $ / shares	10.83
Options vested and expected to vest (in dollars per share) | $ / shares	10.92
Options exercisable at September 30, 2016 (in dollars per share) | $ / shares	$ 11.11
Weighted Average Remaining Contractual Term (in years)
Options outstanding at September 30, 2016	6 years 7 days
Options vested and expected to vest	5 years 10 months 10 days
Options exercisable at September 30, 2016	5 years 2 months 9 days
Aggregate Intrinsic Value
Options outstanding at September 30, 2016 | $	$ 4,452
Options vested and expected to vest | $	4,169
Options exercisable at September 30, 2016 | $	$ 3,724

Stockholders' Equity (Summary51

Stockholders' Equity (Summary of Options by Range of Exercise Prices) (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2016$ / sharesshares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, Number of shares outstanding | shares	8,220
Options outstanding, Weighted-average remaining contractual life	6 years 7 days
Options outstanding, Weighted-average exercise price (in dollars per share)	$ 10.83
Options exercisable, Number of shares | shares	5,898
Options exercisable, Weighted-average exercise price (in dollars per share)	$ 11.11
$1.79 - $6.32 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum (in dollars per share)	1.79
Exercise price range, maximum (in dollars per share)	$ 6.32
Options outstanding, Number of shares outstanding | shares	884
Options outstanding, Weighted-average remaining contractual life	3 years 1 month 28 days
Options outstanding, Weighted-average exercise price (in dollars per share)	$ 4.46
Options exercisable, Number of shares | shares	717
Options exercisable, Weighted-average exercise price (in dollars per share)	$ 4.03
$6.54 - $9.20 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum (in dollars per share)	6.54
Exercise price range, maximum (in dollars per share)	$ 9.20
Options outstanding, Number of shares outstanding | shares	898
Options outstanding, Weighted-average remaining contractual life	6 years 3 months 15 days
Options outstanding, Weighted-average exercise price (in dollars per share)	$ 7.42
Options exercisable, Number of shares | shares	529
Options exercisable, Weighted-average exercise price (in dollars per share)	$ 7.44
$9.24 - $9.34 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum (in dollars per share)	9.24
Exercise price range, maximum (in dollars per share)	$ 9.34
Options outstanding, Number of shares outstanding | shares	842
Options outstanding, Weighted-average remaining contractual life	6 years 3 months 18 days
Options outstanding, Weighted-average exercise price (in dollars per share)	$ 9.26
Options exercisable, Number of shares | shares	612
Options exercisable, Weighted-average exercise price (in dollars per share)	$ 9.26
$9.44 - $10.09 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum (in dollars per share)	9.44
Exercise price range, maximum (in dollars per share)	$ 10.09
Options outstanding, Number of shares outstanding | shares	729
Options outstanding, Weighted-average remaining contractual life	7 years 10 months 28 days
Options outstanding, Weighted-average exercise price (in dollars per share)	$ 9.90
Options exercisable, Number of shares | shares	451
Options exercisable, Weighted-average exercise price (in dollars per share)	$ 9.89
$10.13 - $10.13 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum (in dollars per share)	10.13
Exercise price range, maximum (in dollars per share)	$ 10.13
Options outstanding, Number of shares outstanding | shares	1,105
Options outstanding, Weighted-average remaining contractual life	6 years 10 months 21 days
Options outstanding, Weighted-average exercise price (in dollars per share)	$ 10.13
Options exercisable, Number of shares | shares	602
Options exercisable, Weighted-average exercise price (in dollars per share)	$ 10.13
$10.31 - $12.32 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum (in dollars per share)	10.31
Exercise price range, maximum (in dollars per share)	$ 12.32
Options outstanding, Number of shares outstanding | shares	921
Options outstanding, Weighted-average remaining contractual life	6 years 7 days
Options outstanding, Weighted-average exercise price (in dollars per share)	$ 11.21
Options exercisable, Number of shares | shares	676
Options exercisable, Weighted-average exercise price (in dollars per share)	$ 11.47
$12.46 - $13.28 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum (in dollars per share)	12.46
Exercise price range, maximum (in dollars per share)	$ 13.28
Options outstanding, Number of shares outstanding | shares	1,166
Options outstanding, Weighted-average remaining contractual life	5 years 3 months 11 days
Options outstanding, Weighted-average exercise price (in dollars per share)	$ 13.10
Options exercisable, Number of shares | shares	1,017
Options exercisable, Weighted-average exercise price (in dollars per share)	$ 13.10
$13.34 - $16.98 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum (in dollars per share)	13.34
Exercise price range, maximum (in dollars per share)	$ 16.98
Options outstanding, Number of shares outstanding | shares	1,286
Options outstanding, Weighted-average remaining contractual life	6 years 6 months 29 days
Options outstanding, Weighted-average exercise price (in dollars per share)	$ 15.22
Options exercisable, Number of shares | shares	905
Options exercisable, Weighted-average exercise price (in dollars per share)	$ 15.89
$17.88 - $18.09 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum (in dollars per share)	17.88
Exercise price range, maximum (in dollars per share)	$ 18.09
Options outstanding, Number of shares outstanding | shares	384
Options outstanding, Weighted-average remaining contractual life	5 years 7 months 28 days
Options outstanding, Weighted-average exercise price (in dollars per share)	$ 18.06
Options exercisable, Number of shares | shares	384
Options exercisable, Weighted-average exercise price (in dollars per share)	$ 18.06
$18.24 - $18.24 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum (in dollars per share)	18.24
Exercise price range, maximum (in dollars per share)	$ 18.24
Options outstanding, Number of shares outstanding | shares	5
Options outstanding, Weighted-average remaining contractual life	5 years 9 months 29 days
Options outstanding, Weighted-average exercise price (in dollars per share)	$ 18.24
Options exercisable, Number of shares | shares	5
Options exercisable, Weighted-average exercise price (in dollars per share)	$ 18.24

Stockholders' Equity (Summary52

Stockholders' Equity (Summary of Restricted Stock Unit Activity and Weighted Average Exercise Price) (Details) - Restricted Stock Units (RSUs) [Member] $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)$ / sharesshares
Number of Shares (in thousands)
Balance outstanding at December 31, 2015 | shares	1,202
Awarded | shares	571
Released | shares	(330)
Forfeited | shares	(170)
Non-vested and outstanding at September 30, 2016 | shares	1,273
Expected to vest (shares) | shares	927
Weighted Average Grant Date Fair Value (usd per share)
Balance outstanding at December 31, 2015 | $ / shares	$ 10.31
Awarded | $ / shares	6.32
Released | $ / shares	10.31
Forfeited | $ / shares	10.26
Non-vested and outstanding at September 30, 2016 | $ / shares	8.53
Expected to vest (usd per share) | $ / shares	$ 8.90
Aggregate Fair Value (in thousands)
Non-vested and outstanding at September 30, 2016 | $	$ 10,699
Expected to vest | $	$ 7,799

Restructuring (Details)

Restructuring (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring expense	[1],[2]	$ (384)	$ 0	$ (384)	$ 2,988
Restructuring liability						$ 1,515
Contract Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense					1,745
Restructuring liability						569
Severance and Other Associated Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense					$ 1,243
Restructuring liability						946
Accrued Expenses And Other Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring liability						$ 1,500
[1]	Amounts include depreciation expense as follows: Cost of revenue $1,756 thousand and $2,266 thousand for the three months ended September 30, 2016 and 2015, respectively, Sales and marketing $212 thousand and $254 thousand for the three months ended September 30, 2016 and 2015, respectively, General and administrative $435 thousand and $190 thousand for the three months ended September 30, 2016 and 2015, respectively, and Product development $247 thousand and $229 thousand for the three months ended September 30, 2016 and 2015, respectively. Amounts include depreciation expense as follows: Cost of revenue $6,469 thousand and $6,491 thousand for the three months ended September 30, 2016 and 2015, respectively, Sales and marketing $1,012 thousand and $819 thousand for the three months ended September 30, 2016 and 2015, respectively, General and administrative $1,215 thousand and $663 thousand for the three months ended September 30, 2016 and 2015, respectively, and Product development $749 thousand and $626 thousand for the three months ended September 30, 2016 and 2015, respectively.
[2]	Amounts include stock compensation expense as follows: Cost of revenue $121 thousand and $288 thousand for the three months ended September 30, 2016 and 2015, respectively, Sales and marketing $502 thousand and $760 thousand for the three months ended September 30, 2016 and 2015, respectively, General and administrative $759 thousand and $911 thousand for the three months ended September 30, 2016 and 2015, respectively and Product development $873 thousand and $927 thousand for the three months ended September 30, 2016 and 2015, respectively. Amounts include stock compensation expense as follows: Cost of revenue $342 thousand and $1,092 thousand for thenine months ended September 30, 2016 and 2015, respectively, Sales and marketing $1,936 thousand and $2,292 thousand for the nine months ended September 30, 2016 and 2015, respectively, General and administrative $2,552 thousand and $2,590 thousand for the nine months ended September 30, 2016 and 2015, respectively and Product development $2,770 thousand and $2,819 thousand for the nine months ended September 30, 2016 and 2015, respectively.