Interactive Intelligence 10-K 29 Feb 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 15, 2016	Jun. 30, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	Interactive Intelligence Group, Inc.
Entity Central Index Key	1,517,650
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		22,031,890
Entity Public Float			$ 772,774,951
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 94,808	$ 36,168
Short-term investments	64,182	20,041
Accounts receivable, net of allowance for doubtful accounts of $1,508 at December 31, 2015 and $1,052 at December 31, 2014	106,950	87,413
Prepaid expenses	32,709	29,417
Other current assets	13,264	14,655
Total current assets	311,913	187,694
Long-term investments	30,503	5,495
Property and equipment, net	44,837	44,785
Capitalized software, net	43,783	33,598
Goodwill	41,848	43,732
Intangible assets, net	14,427	16,517
Other assets, net	6,222	6,902
Total assets	493,533	338,723
Current liabilities:
Accounts payable	10,571	10,236
Accrued liabilities	17,157	18,299
Accrued compensation and related expenses	18,910	19,211
Deferred license and hardware revenues	7,823	5,945
Deferred recurring revenues	92,773	76,647
Deferred services revenues	14,979	9,925
Total current liabilities	162,213	140,263
Convertible notes	118,022	0
Long-term deferred revenues	19,834	18,158
Deferred tax liabilities, net	2,143	2,437
Other long-term liabilities	7,291	7,135
Total liabilities	309,503	167,993
Shareholders' equity:
Common stock, $0.01 par value; 100,000,000 authorized; 21,821,895 issued and outstanding at December 31, 2015 21,278,858 issued and outstanding at December 31, 2014	218	213
Additional paid-in capital	237,496	196,691
Accumulated other comprehensive loss	(11,244)	(5,561)
Accumulated deficit	(42,440)	(20,613)
Total shareholders' equity	184,030	170,730
Total liabilities and shareholders' equity	$ 493,533	$ 338,723

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Accounts receivable, allowance for doubtful accounts	$ 1,508	$ 1,052
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	21,821,895	21,278,858
Common stock , shares outstanding (in shares)	21,821,895	21,278,858

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Recurring	$ 230,697	$ 187,373	$ 147,941
License and hardware	99,001	99,200	117,708
Services	61,164	54,723	52,585
Total revenues	390,862	341,296	318,234
Costs of revenues (1)(2):
Costs of recurring	82,147	63,917	44,961
Costs of license and hardware	26,999	28,089	29,429
Costs of services	44,474	44,056	38,760
Total costs of revenues	153,620	136,062	113,150
Gross profit	237,242	205,234	205,084
Operating expenses (1)(2):
Sales and marketing	130,237	119,143	103,777
Research and development	73,198	59,482	50,397
General and administrative	49,219	44,388	36,513
Total operating expenses	252,654	223,013	190,687
Operating (loss) income	(15,412)	(17,779)	14,397
Other (expense) income:
Interest (expense) income, net	(4,109)	1,011	833
Other expense	(932)	(727)	(2,142)
Total other (expense) income	(5,041)	284	(1,309)
(Loss) income before income taxes	(20,453)	(17,495)	13,088
Income tax expense	(1,374)	(23,872)	(3,573)
Net (loss) income	$ (21,827)	$ (41,367)	$ 9,515
Net income (loss) per share:
Basic (in dollars per share)	$ (1.01)	$ (1.98)	$ 0.47
Diluted (in dollars per share)	$ (1.01)	$ (1.98)	$ 0.45
Shares used to compute net income (loss) per share:
Basic (shares)	21,609	20,930	20,033
Diluted (shares)	21,609	20,930	21,088
Total intangible amortization expense	$ 2,468	$ 2,421	$ 2,058
Total stock-based compensation expense	16,163	13,259	9,247
Costs of license and hardware
Shares used to compute net income (loss) per share:
Total intangible amortization expense	715	540	196
General and administrative
Shares used to compute net income (loss) per share:
Total intangible amortization expense	1,753	1,881	1,862
Total stock-based compensation expense	4,386	3,378	2,354
Costs of recurring revenues
Shares used to compute net income (loss) per share:
Total stock-based compensation expense	1,828	1,345	806
Costs of services revenues
Shares used to compute net income (loss) per share:
Total stock-based compensation expense	717	432	245
Sales and marketing
Shares used to compute net income (loss) per share:
Total stock-based compensation expense	3,959	4,077	3,109
Research and development
Shares used to compute net income (loss) per share:
Total stock-based compensation expense	$ 5,273	$ 4,027	$ 2,733

Consolidated Statement of Share

Consolidated Statement of Shareholders' Equity - USD ($)	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings (Accumulated Deficit)
Balance at Dec. 31, 2012	$ 144,117,000	$ 194,000	$ 133,359,000	$ (675,000)	$ 11,239,000
Balance (in shares) at Dec. 31, 2012		19,437,000
Stock-based compensation expense	9,247,000		9,247,000
Exercise of stock options	14,122,000	$ 11,000	14,111,000
Exercise of stock options (in shares)		1,007,000
Issuances of common stock	837,000		837,000
Issuances of common stock (in shares)		19,000
Issuance of restricted stock units, net of tax withholdings	(961,000)		(961,000)
Issuance of restricted stock units, net of tax withholdings (in shares)		41,000
Tax benefits from stock-based payment arrangements	13,479,000		13,479,000
Equity component of convertible notes	0
Net income	9,515,000				9,515,000
Foreign currency translation adjustment	(907,000)			(907,000)
Net unrealized investment loss	(94,000)			(94,000)
Balance at Dec. 31, 2013	189,355,000	$ 205,000	170,072,000	(1,676,000)	20,754,000
Balance (in shares) at Dec. 31, 2013		20,504,000
Stock-based compensation expense	14,912,000		14,912,000
Issuance of restricted shares	4,692,000		4,692,000
Exercise of stock options	8,610,000	$ 8,000	8,602,000
Exercise of stock options (in shares)		673,000
Issuances of common stock	1,320,000		1,320,000
Issuances of common stock (in shares)		25,000
Issuance of restricted stock units, net of tax withholdings	(2,724,000)		(2,724,000)
Issuance of restricted stock units, net of tax withholdings (in shares)		77,000
Tax benefits from stock-based payment arrangements	0
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation	(183,000)		(183,000)
Equity component of convertible notes	0
Net income	(41,367,000)				(41,367,000)
Foreign currency translation adjustment	(3,745,000)			(3,745,000)
Net unrealized investment loss	(140,000)			(140,000)
Balance at Dec. 31, 2014	$ 170,730,000	$ 213,000	196,691,000	(5,561,000)	(20,613,000)
Balance (in shares) at Dec. 31, 2014	21,278,858	21,279,000
Stock-based compensation expense	$ 17,541,000		17,541,000
Exercise of stock options	4,704,000	$ 5,000	4,699,000
Exercise of stock options (in shares)		251,000
Issuances of common stock	1,595,000		1,595,000
Issuances of common stock (in shares)		76,000
Issuance of restricted stock units, net of tax withholdings	(3,531,000)		(3,531,000)
Issuance of restricted stock units, net of tax withholdings (in shares)		156,000
Tax benefits from stock-based payment arrangements	0
Issuance of retirement plan shares	2,523,000		2,523,000
Issuance of retirement plan shares (in shares)		60,000
Equity component of convertible notes	31,756,000		31,756,000
Equity component of convertible notes issuance cost	(1,028,000)		(1,028,000)
Payment for capped call premiums	(12,750,000)		(12,750,000)
Net income	(21,827,000)
Foreign currency translation adjustment	(5,611,000)			(5,611,000)
Net unrealized investment loss	(72,000)			(72,000)
Balance at Dec. 31, 2015	$ 184,030,000	$ 218,000	$ 237,496,000	$ (11,244,000)	$ (42,440,000)
Balance (in shares) at Dec. 31, 2015	21,821,895	21,822,000

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating activities:
Net (loss) income	$ (21,827)	$ (41,367)	$ 9,515
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:
Depreciation	16,909	15,787	11,664
Amortization	8,653	2,421	2,058
Other non-cash items	(2,221)	(1,033)	1,439
Stock-based compensation expense	16,163	13,259	9,247
Excess tax benefits from stock-based compensation arrangements	0	0	(13,479)
Deferred income taxes	(294)	23,550	(4,795)
Amortization (accretion) of investment premium (discount)	(750)	523	(37)
Loss on disposal of fixed assets	62	76	0
Amortization of debt issuance costs	401	0	0
Amortization of debt discount	3,203	0	0
Changes in operating assets and liabilities:
Accounts receivable	(19,537)	(6,999)	(12,005)
Prepaid expenses	(3,261)	(7,374)	(6,178)
Other current assets	1,472	(1,257)	737
Accounts payable	335	1,509	(69)
Accrued liabilities	1,601	1,371	1,233
Accrued compensation and related expenses	(301)	1,717	3,854
Deferred licenses and hardware revenues	1,999	(4,355)	4,284
Deferred recurring revenues	15,878	17	17,183
Deferred services revenues	6,857	(943)	2,462
Other assets and liabilities	290	1,382	262
Net cash provided by (used in) operating activities	25,632	(1,716)	27,375
Investing activities:
Sales of available-for-sale investments	26,659	48,750	26,803
Purchases of available-for-sale investments	(95,131)	(32,967)	(33,270)
Purchases of property and equipment	(17,579)	(21,363)	(20,758)
Capitalized software	(15,284)	(20,417)	(6,112)
Acquisitions, net of cash acquired	(733)	(9,173)	(725)
Unrealized loss (gain) on investments	1	(33)	34
Net cash used in investing activities	(102,067)	(35,203)	(34,028)
Financing activities:
Proceeds from issuance of convertible debt	150,000	0	0
Payment for debt issuance costs	(4,854)	0	0
Payment for capped call premiums	(12,750)	0	0
Principal payments on capital lease obligations	(89)	0	0
Proceeds from stock options exercised	4,704	8,610	14,122
Proceeds from issuance of common stock	1,595	1,320	837
Tax withholding on restricted stock awards	(3,531)	(2,724)	(961)
Excess tax benefits from stock-based compensation arrangements	0	0	13,479
Net cash provided by financing activities	135,075	7,206	27,477
Net increase (decrease) in cash and cash equivalents	58,640	(29,713)	20,824
Cash and cash equivalents, beginning of period	36,168	65,881	45,057
Cash and cash equivalents, end of period	94,808	36,168	65,881
Cash paid during the period for:
Interest	979	0	6
Income taxes	1,312	2,410	882
Equity component of convertible notes	31,756	0	0
Issuance of retirement plan shares	2,523	0	0
Acquisition of equipment under capital leases	1,445	0	0
Other Noncash Investing and Financing Items [Abstract]
Capital Expenditures Incurred but Not yet Paid	$ 116	$ 1,761	$ 413

Consolidated Statements of Comp

Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (21,827)	$ (41,367)	$ 9,515
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Foreign currency translation adjustment	(5,611)	(3,745)	(907)
Net unrealized investment loss	(72)	(140)	(94)
Comprehensive (loss) income	$ (27,510)	$ (45,252)	$ 8,514

The Company

The Company	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
THE COMPANY	THE COMPANY Interactive Intelligence Group, Inc. (together with its consolidated subsidiaries, "Interactive Intelligence" or the "Company") is a global provider of software and cloud services for customer engagement, communications and collaboration. Interactive Intelligence is the only vendor to be recognized by leading industry analyst firm Gartner, Inc. as a market leader in both its Magic Quadrant for Contact Center Infrastructure, 2015 (for its on-premises offering) and its Magic Quadrant for Contact Center as a Service, North America 2015 (for its cloud offerings). The Company offers three types of products: on-premises software; a single-tenant cloud service; and a multi-tenant cloud service. The Company's offerings are used across a wide variety of vertical industries, including accounts receivable management, banking, government, healthcare, insurance, manufacturing, outsourcing, utilities and retail, among others. Interactive Intelligence continues to invest in the development of both its on-premises and cloud offerings, with particular emphasis on its latest cloud services delivered by its PureCloud SM ("PureCloud") Platform. This cloud platform was designed as a set of components that work independently of each other to deliver coordinated services (a "microservices architecture"). The PureCloud Platform leverages Amazon Web Services ("AWS") and has a comprehensive set of features capable of delivering cloud services for organizations of all types and sizes. The first PureCloud services were released in North America in March 2015. Subsequent releases were made available in 2015 in Australia, New Zealand and throughout Europe. The Company commenced principal operations in 1994 and revenues were first recognized in 1997. Since then, the Company has established wholly-owned subsidiaries in 14 other countries. The Company’s world headquarters are located in Indianapolis, Indiana with regional offices throughout the United States and 20 other countries. The Company markets its software products worldwide.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Accounting Changes and Error Corrections [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Principles of Consolidation The accompanying consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after elimination of all significant intercompany accounts and transactions. Use of Estimates The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. On an on-going basis, management reevaluates these estimates including those related to revenue recognition, allowance for doubtful accounts, stock-based compensation, research and development, legal, goodwill and intangible assets, other assets and accounting for income taxes. Despite management’s best effort to establish good faith estimates and assumptions, actual results could differ from these estimates. Revenue Recognition The Company reports three types of revenues: recurring revenues, license and hardware revenues and services revenues. Recurring revenues are generated by fees from the Company’s cloud offerings and annual support fees from on-premises license agreements. License and hardware revenues are generated from licensing the right to use its software products on-premises and, in certain instances, selling hardware as a component of the product offering. Services revenues are generated primarily from professional services and educational services fees. Revenues are generated by direct sales to customers and by indirect sales through the Company’s partner channels. Recurring Revenues The Company generates recurring revenues from its cloud offerings and annual support fees. The Company's single-tenant and some of its multi-tenant cloud customers pay a minimum monthly fee to use a specified number of software licenses, plus any overages above the minimum. Customers are generally billed the greater of their minimum monthly fee or actual usage, and revenues are recognized monthly as services are delivered. Other multi-tenant cloud customers have signed month-to-month contracts and are billed monthly for actual usage. This revenue is recognized monthly as services are delivered. The total contract fee also includes an implementation fee, which is recognized ratably over the term of the contract. The Company recognizes annual support fees as recurring revenues ratably over the post-contract support period, which is typically 12 months , but may extend up to three years if prepaid. License and Hardware Revenues For any revenues to be recognized from a perpetual license agreement, the following criteria must be met: • Persuasive evidence of an arrangement exists; • The fee is fixed or determinable; • Collection is probable; and • Delivery has occurred. Upon meeting the revenue recognition criteria above, the Company immediately recognizes as license and hardware revenues the residual amount of the total contract fees if sufficient vendor specific objective evidence (“VSOE”) of fair value exists to support allocating a portion of the total fee to the undelivered elements of the arrangement. If sufficient VSOE of fair value for the undelivered product support does not exist, the Company recognizes the initial license fee as license and hardware revenues ratably over the initial term of the support agreement once support is the only undelivered element. The support period is generally 12 months but may be up to 18 months for initial sales because support begins when the licenses are downloaded, when support commences or no more than six months following the contract date. If the contract includes prepaid support, the support period may be up to 36 months . The Company determines VSOE of fair value for support in on-premises agreements based on substantive renewal rates the customer must pay to renew the support. The VSOE of fair value for other services is based on amounts charged when the services are sold in stand-alone sales. The Company sells hardware manufactured by third parties, which does not contain the Company’s software, and certain appliances, including the Interactive EDGE, Interaction Gateway and Interaction Media Server, which combine third-party hardware and the Company’s Interaction Gateway or Interaction Media Server software. These appliances are not pre-loaded with the Company’s Customer Interaction Center ("CIC") software and the Company does not require its customers to purchase these items directly from them. The Company’s CIC software will still function properly on hardware, gateways or media servers purchased from other vendors. Although the appliances mentioned above are a combination of hardware and software, the software does not primarily work together with the hardware to provide the hardware’s essential functionality. In addition, the Interaction Media Server software can be purchased separately and loaded onto other media servers the customer already owns or purchased from another vendor. The Company recognizes revenues related to hardware sales when the hardware is delivered and all other revenue recognition criteria are met. Contracts that contain both software and hardware are reviewed to allocate the deliverables into separate units of accounting in accordance with Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") Topic 605-25, Revenue Recognition – Multiple Element Arrangements ("FASB ASC 605-25"). The units of accounting fall into one of two categories: software or non-software related products. FASB ASC 605-25 is used to allocate the fair value of each. Services Revenues The Company generates revenues from other services that it provides to its customers and partners including fees for professional services and educational services. Revenues from professional services, which include implementing the Company’s product offerings and subsequent services engagements and educational services, which consist of training courses for customers and partners, are recognized as the related services are performed. Accounts Receivable and Allowance for Doubtful Accounts Receivable Trade accounts receivable are recorded at the invoiced amount. The allowance for doubtful accounts is the Company’s best estimate of the amount of probable credit losses in the Company’s existing accounts receivable. The Company estimates bad debt expense based on a percentage of revenue reported and a detailed analysis of receivables each period. The Company reviews the allowance for doubtful accounts each reporting period based on a detailed analysis of its accounts receivable. In the analysis, the Company primarily considers the age of the customer’s or partner’s receivable and also considers the creditworthiness of the customer or partner, the economic conditions of the customer’s or partner’s industry and general economic conditions, among other factors. If any of these factors change, the Company may also change its original estimates, which could impact the level of its future allowance for doubtful accounts. If payment is not made timely, the Company will contact the customer or partner to try to obtain the payment. If this is not successful, the Company will institute other collection practices such as generating collection letters, charging interest, involving sales personnel and ultimately terminating the customer’s or partner’s access to future upgrades, licenses or services and technical support. Once all collection efforts are exhausted, the receivable is written off against the allowance for doubtful accounts. Cash and Cash Equivalents The Company considers all highly liquid investments with a maturity of three months or less from date of purchase to be cash equivalents. Cash and cash equivalents consist primarily of cash on deposit with financial institutions and high quality money market instruments. Investments The Company’s investments, which consist primarily of taxable corporate and government debt securities, are classified as available-for-sale. Such investments are recorded at fair value and unrealized gains and losses are excluded from earnings and recorded as a separate component of equity until realized. Premiums or discounts are amortized or accreted over the life of the related security as an adjustment to yield using the effective interest method. Realized gains and losses from the sale of available-for-sale securities are determined on a specific identification basis. A decline in the market value of securities below cost judged to be other than temporary results in a reduction in the carrying amount to fair value. The impairment is charged to earnings and a new cost basis for the security is established. Interest and dividends on all securities are included in interest income when earned. Property and Equipment Property and equipment are stated at cost. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized using the straight-line method over the lesser of the term of the related lease or the estimated useful life. The Company leases its office space under operating lease agreements. In accordance with FASB ASC Topic 840, Leases ("FASB ASC 840"), for operating leases with escalating rent payments, the Company records rent expense on a straight-line basis over the life of the lease. Impairment of Long-Lived Assets In accordance with FASB ASC Topic 360, Property, Plant and Equipment, certain of the Company’s assets, such as property and equipment and intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized for the amount by which the carrying amount of the asset exceeds the fair value of the asset. Identifiable intangible assets such as intellectual property trademarks and patents are amortized over a 10 to 15 year period using the straight-line method. In addition, other intangible assets, such as customer relationships, core technology and non-compete agreements are amortized over a 5 to 18 year period using the straight-line method. Goodwill and Other Intangible Assets The Company reviews goodwill and intangible assets with indefinite lives for impairment at least annually in accordance with FASB Accounting Standards Update ("ASU") 2011-8, Testing Goodwill for Impairment ("FASB ASU 2011-8") , which amends FASB ASC Topic 350, Intangibles – Goodwill and Other ("FASB ASC 350"). This guidance requires the Company to perform the goodwill impairment analysis annually or when a change in facts and circumstances indicates that the fair value of an asset may be below its carrying amount. Application of goodwill impairment testing involves judgment, including but not limited to, the identification of reporting units and estimation of the fair value of each reporting unit. A reporting unit is defined as an operating segment or one level below an operating segment. The Company tests goodwill at the operating segment level as it has determined that the characteristics of the reporting units within its operating segment are similar and allow for their aggregation in accordance with the applicable accounting guidance. Based on the quantitative review, the Company determined that the fair value of its reporting unit was greater than its carrying amount. The Company determined no indication of impairment existed as of December 31, 2015 when the annual impairment tests were performed for goodwill and indefinite-lived intangible assets. Advertising The Company expenses all advertising costs as incurred. Advertising expense for 2015 , 2014 and 2013 was $4.8 million , $6.2 million and $6.4 million , respectively. Research and Development Research and development expenditures for the Company’s on-premises and single-tenant cloud offerings are generally expensed as incurred. FASB ASC Topic 985, Software , requires capitalization of certain software development costs subsequent to the establishment of technological feasibility. Based on the Company’s product development process, technological feasibility is established upon completion of a working model. Historically, costs incurred by the Company between completion of the working model and the point at which the product is ready for general release have been insignificant as it related to our on-premises and single-tenant cloud offerings. During 2015 , the Company continued to invest in its PureCloud Platform, a next generation cloud communication platform. This platform is the Company’s first product offered solely as a cloud service, with no on-premises option. The costs incurred for this new platform result from internal activity, as the Company does not intend to sell the PureCloud product but offers PureCloud as a service. As a result, the Company capitalized $12.7 million and $16.9 million of internal use software costs relating to the PureCloud Platform during 2015 and 2014 , respectively. Research and development expense (after capitalization) for 2015 , 2014 and 2013 was $73.2 million , $59.5 million and $50.4 million , respectively. The Company began amortizing development costs related to PureCloud Collaborate SM , PureCloud Communicate SM and PureCloud Engage SM during 2015, with such amortization included in costs of recurring revenue. The Company will continue to capitalize development costs related to new PureCloud offerings and will begin amortizing such costs once those offerings are released for general availability. Stock-Based Compensation Consistent with FASB ASC Topic 718, Compensation – Stock Compensation ("FASB ASC 718"), the Company uses the Black-Scholes option-pricing model as its method of valuation for stock option awards. The Company’s determination of fair value of stock option awards on the date of grant using the Black-Scholes option-pricing model is affected by the Company’s stock price as well as assumptions regarding a number of highly complex and subjective variables. These variables include, but are not limited to, the Company’s expected stock price volatility over the expected term of the awards and an expected risk-free rate of return. If factors change and the Company uses different assumptions for estimating stock-based compensation expense associated with awards granted in future periods, stock-based compensation expense may differ materially in the future from that recorded in the current period. The Company records compensation expense for stock-based awards using the straight-line method, which is expensed over the vesting period of the award. Stock-based compensation expense for employee and director stock options and restricted stock units recognized under FASB ASC 718 for the years ended December 31, 2015 , 2014 and 2013 was $16.2 million , $13.3 million and $9.2 million , respectively. See Note 7 for further information on the Company’s stock-based compensation. Fair Value Measurements The carrying amounts of the Company’s financial instruments, including cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities, approximate their respective fair market values due to the short maturities of these financial instruments. The fair values of short-term and long-term investments are valued in accordance with FASB ASC Topic 820, Fair Value Measurements and Disclosures ("FASB ASC 820"). Income Taxes Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. FASB ASC Topic 740, Income Taxes ("FASB ASC 740"), establishes financial accounting and reporting standards for the effect of income taxes. The Company is subject to income taxes in both the United States and numerous foreign jurisdictions. Significant judgment is required in evaluating the Company’s tax positions and determining its provision for income taxes. The objectives of accounting for income taxes are to recognize the amount of taxes payable or refundable for the current year and deferred tax liabilities and assets for the future tax consequences of events that have been recognized in an entity’s financial statements or tax returns. Variations in the actual outcome of these future tax consequences could materially impact the Company’s financial position, results of operations or cash flows. In assessing the recoverability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon generation of future taxable income prior to the period in which temporary differences such as loss carryforwards and tax credits expire. Management considers the scheduled reversal of deferred tax liabilities, if any (including the impact of available carryback and carryforward periods), projected future taxable income and tax planning strategies in making this assessment. During the fourth quarter of 2014, the Company recorded deferred income tax expense of $33.4 million related to recording a valuation allowance to reduce a significant portion of the Company’s deferred tax assets. The Company has incurred cumulative tax losses in recent periods due to its business model shift to the cloud. Such tax losses may continue for a period of time. This deferred income tax expense reflects the Company’s assessment that it is more likely than not that the deferred tax assets will not be realizable in the foreseeable future. As of December 31, 2015 , the Company had $13.6 million in tax credit carryforwards recorded as deferred tax assets as well as a valuation allowance of $42.8 million . The Company will continue to evaluate the valuation of deferred tax assets in accordance with the requirements of FASB ASC 740. See Note 10 for further information on the Company’s income taxes. The revenue from sales tax collected from customers is recorded on a net basis. Net (Loss) Income per Share Basic net (loss) income per share is calculated based on the weighted-average number of common shares outstanding in accordance with FASB ASC Topic 260, Earnings per Share . Diluted net income per share is calculated based on the weighted-average number of common shares outstanding plus the effect of dilutive potential common shares. When the Company reports a net loss, the calculation of diluted net loss per share excludes potential common shares as the effect would be anti-dilutive. Potential common shares are composed of shares of common stock issuable upon the exercise of stock options and vesting of restricted stock units ("RSUs"). The calculation of diluted net income per share excludes shares underlying stock options outstanding that would be anti-dilutive. The following table sets forth the calculation of basic and diluted net income (loss) per share (in thousands, except per share amounts): Years Ended December 31, 2015 2014 2013 Net (loss) income, as reported (A) $ (21,827 ) $ (41,367 ) $ 9,515 Weighted average shares of common stock outstanding (B) 21,609 20,930 20,033 Dilutive effect of employee stock options and RSUs — — 1,055 Common stock and common stock equivalents (C) 21,609 20,930 21,088 Net (loss) income per share: Basic (A/B) $ (1.01 ) $ (1.98 ) $ 0.47 Diluted (A/C) (1.01 ) (1.98 ) 0.45 The Company’s calculation of diluted net (loss) income per share for 2015 , 2014 and 2013 excludes RSUs and stock options to purchase approximately 393,000 , 207,000 and 197,000 shares of the Company's common stock, respectively, as their inclusion would be anti-dilutive. Comprehensive (Loss) Income Comprehensive (loss) income is comprised of net (loss) income and other comprehensive (loss) income. The Company reports unrealized gains (losses) on marketable securities and foreign currency translation adjustments as other comprehensive (loss) income. Legal Proceedings Liabilities for loss contingencies arising from claims, assessments, litigation, fines, penalties and other sources are recorded when it is probable that a liability has been incurred and the amount of the assessment and/or remediation can be reasonably estimated. Legal costs incurred in connection with loss contingencies are expensed as incurred. Internal Use Software The Company capitalizes certain costs related to its PureCloud Platform and certain projects described below for internal use in accordance with FASB ASC 350-40, Internal Use Software. Once a product has reached the development stage, internal and external costs, if direct and incremental, are capitalized until the software is substantially complete and ready for its intended use. The capitalization of costs ceases upon completion of all substantial testing. Costs incurred in the preliminary stages of development, maintenance and training costs are expensed as incurred. During the years ended December 31, 2015 and 2014, the Company capitalized $12.7 million and $16.9 million , respectively, of costs related to the development of its PureCloud Platform. The Company will continue to capitalize development costs related to new PureCloud offerings and will begin amortizing such costs once those offerings are released for general availability. The Company also capitalizes costs related to implementing new business systems to meet its internal business needs. The Company has no substantive plans to market such software externally. During the years ended December 31, 2015 and 2014 , the Company capitalized $4.0 million and $5.2 million , respectively, of costs associated with development and implementation of these systems.

Investments

Investments	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
INVESTMENTS	INVESTMENTS The Company’s short-term investments all mature in less than one year and the Company’s long-term investments mature between one and three years. Both short-term and long-term investments are considered available for sale. As of December 31, 2015 and 2014 , the Company held $64.2 million and $20.0 million , respectively, in short-term investments and $30.5 million and $5.5 million , respectively, in long-term investments that were recorded at their fair values. The Company does not invest in subprime assets. Gross realized gains and losses included in interest (expense) income, net totaled less than $15,000 in each of 2015 , 2014 and 2013 . FASB ASC 820, as amended, defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. FASB ASC 820 also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes the following three levels of inputs that may be used to measure fair value: • Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. • Level 2 - Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. • Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The Company’s assets that are measured at fair value are classified within Level 1 or Level 2 of the fair value hierarchy. The types of instruments valued based on quoted prices in active markets include money market securities. Such instruments are classified within Level 1 of the fair value hierarchy. The Company invests in money market funds that are traded daily and does not adjust the quoted price for such instruments. The types of instruments valued based on quoted prices in less active markets, broker or dealer quotations or alternative pricing sources with reasonable levels of price transparency include corporate notes, agency bonds, commercial paper, U.S. government securities and asset-backed securities. Such instruments are classified within Level 2 of the fair value hierarchy. The Company uses consensus pricing, which is based on multiple pricing sources, to value its fixed income investments. The following table sets forth a summary of the Company’s financial assets, classified as cash and cash equivalents, short-term investments and long-term investments on its condensed consolidated balance sheet, measured at fair value as of December 31, 2015 and 2014 (in thousands): Fair Value Measurements at December 31, 2015 Using Description Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Cash & cash equivalents: Cash $ 91,974 $ 91,974 $ — $ — Money market funds 2,834 2,834 — — Total $ 94,808 $ 94,808 $ — $ — Short-term investments: Corporate notes $ 27,105 $ — $ 27,105 $ — Agency bonds 27,002 — 27,002 — Asset-backed securities 4,681 — 4,681 — U.S. government securities 3,896 — 3,896 — Commercial paper 1,498 — 1,498 — Total $ 64,182 $ — $ 64,182 $ — Long-term investments: Corporate notes $ 29,504 $ — $ 29,504 $ — Asset-backed securities 999 — 999 — Total $ 30,503 $ — $ 30,503 $ — Fair Value Measurements at December 31, 2014 Using Description Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Cash & cash equivalents: Cash $ 34,452 $ 34,452 $ — $ — Money market funds 1,716 1,716 — — Total $ 36,168 $ 36,168 $ — $ — Short-term investments: Corporate notes $ 19,241 $ — $ 19,241 $ — Commercial paper 800 — 800 — Total $ 20,041 $ — $ 20,041 $ — Long-term investments: U.S. government securities $ 1,000 $ 1,000 $ — $ — Corporate notes 4,495 — 4,495 — Total $ 5,495 $ 1,000 $ 4,495 $ —

Accounts Receivable And Concent

Accounts Receivable And Concentration Of Credit Risk	12 Months Ended
	Dec. 31, 2015
Risks and Uncertainties [Abstract]
ACCOUNTS RECEIVABLE AND CONCENTRATION OF CREDIT RISK	ACCOUNTS RECEIVABLE AND CONCENTRATION OF CREDIT RISK The Company evaluates the creditworthiness of its customers and partners on a periodic basis and generally does not require collateral. The Company records unbilled accounts receivable, which represents amounts recognized as revenues for invoices that have not yet been sent to customers. This balance fluctuates depending on the contractual billing milestones and work performed related to projects specified in the contract. When the work performed is ahead of the billing milestones related to a services engagement, unbilled accounts receivable will be recorded. The balance of unbilled accounts receivable recorded as of December 31, 2015 and 2014 was $9.6 million and $8.0 million , respectively. No customer or partner accounted for 10% or more of the Company’s revenues in 2015 , 2014 or 2013 or for 10% or more of the Company’s accounts receivable as of December 31, 2015 and 2014 . The Company’s top five partners collectively represented 14% and 17% of the Company’s accounts receivable balance at December 31, 2015 and 2014 , respectively.

Property And Equipment

Property And Equipment	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
PROPERTY AND EQUIPMENT	PROPERTY AND EQUIPMENT Property and equipment are summarized as follows as of December 31, 2015 and 2014 (in thousands): 2015 2014 Computer equipment $ 25,050 $ 25,905 Leasehold improvements 22,898 21,103 Furniture and fixtures 12,982 12,719 Data center equipment 35,934 27,800 Software 3,261 2,956 Office equipment 1,467 2,198 Trade show equipment and other 924 929 Construction in process 4,256 1,627 Capital lease assets 1,372 — Total property and equipment 108,144 95,237 Less accumulated depreciation (63,307 ) (50,452 ) Net property and equipment $ 44,837 $ 44,785 Property and equipment is depreciated over useful lives of 3 to 7 years, except for leasehold improvements, which are depreciated over the lesser of the term of the related lease or the estimated useful life, and vary from 3 to 15 years.

Capitalized Software

Capitalized Software	12 Months Ended
	Dec. 31, 2015
Research and Development [Abstract]
CAPITALIZED SOFTWARE	CAPITALIZED SOFTWARE Capitalized software is summarized as follows as of December 31, 2015 and 2014 (in thousands): 2015 2014 Capitalized internal-use software development costs related to PureCloud Platform, net of accumulated amortization of $3,928 and $0, respectively $ 29,275 $ 20,448 Capitalized internal-use software development costs related to internal business systems, net of accumulated amortization of $5,443 and $3,258, respectively 8,060 6,337 Acquired developed technology, net of accumulated amortization of $1,557 and $1,161, respectively 6,448 6,813 $ 43,783 $ 33,598 Capitalized PureCloud amortization expense totaled $3.9 million for the year ended December 31, 2015. The Company had not amortized any of the capitalized internal-use software development costs related to the PureCloud Platform as of December 31, 2014, as the software was not yet generally available. Capitalized internal use software amortization expense related to internal business systems totaled $2.2 million , $1.1 million and $1.1 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. Acquired developed technology amortization expense totaled $396,000 , $540,000 and $196,000 for the years ended December 31, 2015 , 2014 and 2013 , respectively. During the years ended December 31, 2015 and 2014 , the Company capitalized $12.7 million and $16.9 million , respectively, of costs related to the development of its PureCloud Platform. During the years ended December 31, 2015 and 2014 , the Company capitalized $4.0 million and $5.2 million , respectively, of costs associated with the development and implementation of its internal business systems. During the years ended December 31, 2015 and 2014, the Company capitalized $350,000 and $5.8 million , respectively, of acquired developed technology.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK-BASED COMPENSATION	STOCK-BASED COMPENSATION. Equity Plans The Company’s 2006 Equity Incentive Plan, as amended and as assumed by Interactive Intelligence Group, Inc. (the "2006 Plan") authorizes the Board of Directors or the Compensation Committee, as applicable, to grant incentive and nonqualified stock options, stock appreciation rights, restricted stock, RSUs, performance shares, performance units and other stock-based awards. After adoption of the 2006 Plan by the Company’s shareholders in May 2006, the Company may no longer make any grants under previous plans. At the Company’s 2013 Annual Meeting of Shareholders on May 22, 2013, the Company’s shareholders approved an amendment to the 2006 plan which increased the number of shares available for issuance under the 2006 Plan by 2,000,000 shares. A maximum of 9,050,933 shares are available for delivery under the 2006 Plan. The number of shares available under the 2006 Plan is subject to adjustment for certain changes in the Company’s capital structure. The exercise price of options granted under the 2006 Plan is equal to the closing price of the Company’s common stock, as reported by The NASDAQ Global Select Market, on the business day immediately preceding the date of grant. As of December 31, 2015 , 2014 and 2013 there were 1,215,271 ; 1,897,742 ; and 2,338,146 shares of stock, respectively, available for issuance for equity compensation awards under the 2006 Plan. The Company grants RSUs and three types of stock options. The first type of stock option is non-performance-based subject only to time-based vesting, and these stock options were historically granted by the Company as annual grants to executives, to certain new employees and to newly-elected non-employee directors. These stock options vest in four equal annual installments beginning one year after the grant date. The fair value of these option grants is determined on the date of grant and the related compensation expense is recognized for the entire award on a straight-line basis over the requisite service period. The second type of stock option granted by the Company is performance-based and is subject to cancellation if the specified performance targets are not met. If the applicable performance targets have been achieved, the options will vest in four equal annual installments beginning one year after the grant date. The fair value of these stock option grants is determined on the date of grant and the related compensation expense is recognized over the requisite service period, including the initial period for which the specified performance targets must be met. The third type of stock option granted by the Company is director options granted to non-employee directors annually. These options are similar to the non-performance-based options described above except that the director options vest one year after the grant date. The fair value of these option grants is determined on the date of the grant and the related compensation expense is recognized over one year. Prior to 2015, these director options were generally granted at the Company’s Annual Meeting of Shareholders during the second quarter of each fiscal year. In 2015, the Company's non-employee directors received RSUs instead of stock options, as described below. If an incentive stock option is granted to an employee who, at the time the option is granted, owns stock representing more than 10% percent of the voting power of all classes of stock of the Company, the exercise price of the option may not be less than 110% of the market value per share on the date the option is granted and the term of the option shall be not more than five years from the date of grant. In 2015, the Company elected to grant RSUs in certain instances. The Company granted performance-based and non-performance-based RSUs to directors, executives, certain key employees and certain new employees and the fair value of the RSUs is determined on the date of grant. Non-performance-based RSUs granted to executives, certain key employees, certain new employees and new non-employee directors vest in four equal annual installments beginning one year after the grant date. Non-performance-based RSUs granted annually to non-employee directors vest in full one year after the grant date. Performance-based RSUs vest in four equal annual installments once the individual has achieved the performance targets. RSUs are not included in issued and outstanding common stock until the shares are vested and settlement has occurred. The 2006 Plan may be terminated by the Company's Board of Directors at any time. Stock-Based Compensation Expense Information The following table summarizes the allocation of stock-based compensation expense related to employee and director stock options and RSUs under FASB ASC 718 for the years ended December 31, 2015 , 2014 and 2013 (in thousands): Years Ended December 31, 2015 2014 2013 Stock-based compensation expense by category: Costs of recurring revenues $ 1,828 $ 1,345 $ 806 Costs of services revenues 717 432 245 Sales and marketing 3,959 4,077 3,109 Research and development 5,273 4,027 2,733 General and administrative 4,386 3,378 2,354 Total stock-based compensation expense $ 16,163 $ 13,259 $ 9,247 Effect of stock-based compensation expense on net income (loss) per share: Basic $ (0.75 ) $ (0.63 ) $ (0.46 ) Diluted (0.75 ) (0.63 ) (0.44 ) During the years ended December 31, 2015 and 2014 , the Company capitalized $1.4 million and $1.7 million of stock-based compensation expense related to capitalized software. No stock-based compensation expenses were capitalized during 2013 . At each quarter end, the Company evaluates the probability that the performance-based awards granted during the year will be forfeited at year-end for non-performance and reverses the associated expense recorded in previous periods. During the fourth quarter of 2015 , 2014 and 2013 , the Company reversed stock option expense recorded in previous periods associated with these performance-based options totaling $194,000 in 2015 , $300,000 in 2014 and $128,000 in 2013 . After taking into account the options that were cancelled during 2015 , 2014 and 2013 , the estimated total grant date fair value, not accounting for estimated forfeitures, is as follows (in thousands): Number of Options Granted Number of Options Cancelled Grant Date Fair Value Year: 2015 — — $ — 2014 271 101 7,068 2013 275 46 4,521 Stock Option and RSU Valuation RSUs are valued using the fair market value of the Company’s stock on the date of grant and expense is recognized on a straight-line basis taking into account an estimated forfeiture rate. The Company estimated the fair value of stock options using the Black-Scholes valuation model. There were no stock options granted during the year ended December 31, 2015 . The weighted-average estimated per option value of non-performance-based and performance-based options granted under the 2006 Plan during the years ended December 31, 2014 and 2013 was $31.38 and $17.99 , respectively, using the following assumptions: Years Ended December 31, Valuation assumptions for non-performance-based options: 2014 2013 Dividend yield — % — % Expected volatility 60.41 % 54.36 - 54.44% Risk-free interest rate 1.38 % 1.04 - 1.12% Expected life of option (in years) 4.00 4.25 Years Ended December 31, Valuation assumptions for performance-based options: 2014 2013 Dividend yield — % — % Expected volatility 59.76 % 57.56 % Risk-free interest rate 1.51 % 0.73 % Expected life of option (in years) 4.50 4.75 Years Ended December 31, Valuation assumptions for annual director options: 2014 2013 Dividend yield — % — % Expected volatility 61.70 % 49.33 % Risk-free interest rate 1.17 % 0.54 % Expected life of option (in years) 4.00 3.50 Expected Dividend: The Black-Scholes valuation model calls for a single expected dividend yield as an input. The Company has never declared or paid cash dividends on its common stock and does not expect to declare or pay any cash dividends in the foreseeable future. Expected Volatility: The Company’s volatility factor was based exclusively on its historical stock prices over the most recent period commensurate with the estimated expected life of the stock options. Risk-Free Rate: The Company bases the risk-free interest rate on the implied yield currently available on U.S. Treasury zero-coupon issues with an equivalent remaining term commensurate with the estimated expected life of the stock options. Expected Term: The Company’s expected term represents the period that the Company’s stock options are expected to be outstanding. Previously, the simplified method as described in FASB ASC 718 was used to calculate the expected term. Beginning in 2013, the Company calculated expected term based on historical exercise data. Estimated Pre-vesting Forfeitures: The Company includes an estimate for forfeitures in calculating stock option expense. When estimating forfeitures, the Company considers historical termination behavior as well as any future trends it expects. In 2005, the Company began issuing options with a term of six years from the date of grant. Stock Option and RSU Activity The following table sets forth a summary of stock option activity for the years ended December 31, 2015 , 2014 and 2013 : Years Ended December 31, 2015 2014 2013 Options Weighted- Average Exercise Price Options Weighted- Average Exercise Price Options Weighted- Average Exercise Price Balances, beginning of year 1,350,799 $ 32.95 1,852,620 $ 22.25 2,631,198 $ 17.21 Options granted — — 225,250 63.15 251,250 41.91 Options exercised (251,464 ) 18.74 (672,321 ) 12.79 (1,007,578 ) 14.00 Options cancelled, forfeited or expired (38,477 ) 45.88 (54,750 ) 42.73 (22,250 ) 20.98 Options outstanding at end of year 1,060,858 35.85 1,350,799 32.95 1,852,620 22.25 Option price range at end of year $ 6.66 - 66.39 $ 6.66 - 66.39 $ 3.53 - 66.21 Weighted-average fair value of options granted $ — $ 31.38 $ 17.99 Options exercisable at end of year 767,052 31.92 723,801 24.98 1,010,495 15.53 The following table sets forth information regarding the Company’s stock options outstanding and exercisable at December 31, 2015 : Options Outstanding Options Exercisable Range of Exercise Prices Number Weighted- Average Remaining Contractual Life Weighted- Average Exercise Price Number Weighted- Average Exercise Price $ 6.66 — $ 19.66 147,725 0.41 $ 18.11 147,725 $ 18.11 19.77 — 22.92 3,400 1.39 21.76 2,150 21.09 24.50 — 24.50 224,379 2.22 24.50 154,379 24.50 25.00 — 30.92 62,750 2.30 27.07 53,000 26.87 32.33 — 32.33 182,250 1.24 32.33 176,625 32.33 32.53 — 37.76 60,500 1.89 33.36 48,000 33.31 39.97 — 39.97 137,905 3.31 39.97 62,471 39.97 48.12 — 64.42 83,000 3.89 49.54 81,500 49.26 66.21 — 66.21 4,000 3.86 66.21 2,000 66.21 66.39 — 66.39 154,949 4.19 66.39 39,202 66.39 Total shares/average price 1,060,858 2.35 35.85 767,052 31.92 The total intrinsic value of options exercised during the year ended December 31, 2015 was $4.9 million . The aggregate intrinsic value of options outstanding as of December 31, 2015 was $3.8 million and the aggregate intrinsic value of options currently exercisable as of December 31, 2015 was $3.3 million . The aggregate intrinsic value represents the total intrinsic value, based on the Company’s closing stock price per share of $31.42 as of December 31, 2015 , which would have been realized by the option holders had all option holders exercised their options as of that date. The total number of in-the-money options exercisable as of December 31, 2015 represented 357,254 shares with a weighted average exercise price of $22.19 . As of December 31, 2015 , there was $4.3 million of total unrecognized compensation expense related to non-vested stock options. This expense is expected to be recognized over the weighted average remaining vesting period of 1.25 years. The following table sets forth a summary of RSU activity for the year ended December 31, 2015 : Awards Weighted- Average Grant Date Price Balances, beginning of year 592,364 $ 50.24 RSUs granted 565,548 41.30 RSUs vested (236,284 ) 46.30 RSUs forfeited (71,400 ) 48.61 RSUs outstanding 850,228 45.53 As of December 31, 2015 , there was $30.6 million of total unrecognized compensation expense related to non-vested RSUs. This expense is expected to be recognized over the weighted average remaining vesting period of 2.43 years. 2000 Employee Stock Purchase Plan In May 2000, the Company adopted the 2000 Employee Stock Purchase Plan (the "2000 Purchase Plan"). A total of 500,000 shares of common stock were reserved for issuance under the 2000 Purchase Plan. In May 2005, the shareholders of the Company approved an amendment to the 2000 Purchase Plan that increased the number of shares of common stock available for purchase and issuance to 750,000 . The 2000 Purchase Plan permits eligible employees to acquire shares of the Company’s common stock through periodic payroll deductions of up to 20% of their total compensation up to a maximum of $1,000 per pay period. The price at which the Company’s common stock may be purchased is 95% of the fair market value of the Company’s closing common stock price, as reported on The NASDAQ Global Select Market, on the last business day of the quarter. The actual purchase date is generally on the first business day of the next calendar quarter. An employee may set aside up to $25,000 to purchase shares annually. The initial offering period commenced on April 1, 2000. A total of 42,635 shares, 25,365 shares and 19,002 shares were purchased and issued during 2015 , 2014 and 2013 , respectively, under the 2000 Purchase Plan at an average price of $37.42 , $52.04 and $44.02 , respectively. As of December 31, 2015 , there were 20,728 shares available for purchase and issuance under the 2000 Purchase Plan. The 2000 Purchase Plan was modified, as of January 1, 2006, to ensure that it was considered non-compensatory under FASB ASC 718. As a result, the Company has not recognized any stock-based compensation expense related to its 2000 Purchase Plan.

Lease Commitments

Lease Commitments	12 Months Ended
	Dec. 31, 2015
Leases [Abstract]
LEASE COMMITMENTS	LEASE COMMITMENTS The Company’s world headquarters are located in approximately 425,000 square feet of space in four leased office buildings in Indianapolis, Indiana. Three of the office buildings were formerly leased pursuant to that certain Office Lease Agreement (the "Office Lease"), dated April 1, 2001, between the Company and Duke Realty Limited Partnership (formerly Duke-Weeks Realty Limited Partnership), as amended. On May 6, 2014, the Company entered into a lease termination agreement with Duke Realty Limited Partnership, whereby the Office Lease (and the eight amendments thereto) was terminated. In place of such Office Lease and amendments, on May 6, 2014, the Company entered into new separate lease agreements with Duke Realty Limited Partnership for each of the three office buildings, one of which expires on March 31, 2018 and two of which expire on or after June 30, 2025. On May 6, 2014, the Company also entered into a lease agreement with Duke Construction Limited Partnership to expand its world headquarters to include a fourth, build-to-suit office building in Indianapolis, Indiana. The construction of the fourth office building was completed in June 2015 and the lease term expires in June 2025. The Company also occupies a product distribution center in Indianapolis, Indiana, has regional offices and international offices in Europe, the Middle East and Africa ("EMEA") and Asia-Pacific ("APAC") and has several other office leases throughout the United States and in 20 other countries with initial lease terms of up to 5 years. The Company rents office space for sales, services, development and international offices under three to five year leases. In accordance with FASB ASC 840, rental expense is recognized ratably over the lease period, including those leases containing escalation clauses. The Company believes that all of its facilities are adequate and well suited to accommodate its business operations. The Company continuously reviews space requirements to ensure it has adequate room for growth in the future. Since December 31, 2015, the Company has not entered into any new operating leases. Rent expense was $13.7 million , $12.5 million and $9.9 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. Minimum future lease payments under the Company’s operating leases as of December 31, 2015 are summarized as follows (in thousands): 2016 $ 14,312 2017 12,586 2018 9,972 2019 9,429 2020 8,988 Thereafter 37,070 Total minimum lease payments $ 92,357

Retirement Savings Plan

Retirement Savings Plan	12 Months Ended
	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
RETIREMENT SAVINGS PLAN	RETIREMENT SAVINGS PLAN The Company maintains a 401(k) retirement savings plan (the "Plan") to provide retirement benefits for substantially all of its North American employees. Participants in the Plan may elect to contribute up to 50% of their pre-tax annual compensation to the Plan, limited to the maximum amount allowed by the Internal Revenue Code, as amended. The Company, at its discretion, may also make annual contributions to the Plan. Effective July 1, 2012, the Plan Administrator approved an amendment to the Plan Document to exclude temporary and leased employees from being able to participate in the Plan. For the year ended December 31, 2015 , the Company matched up to 33% of the first 9% of a participant’s pre-tax compensation contributed to the Plan, which resulted in an aggregate match of $3.0 million contributed to the employees' accounts in February 2016. For the years ended December 31, 2014 and 2013 , subject to meeting specified operating targets, the Company matched up to 33% of the first 9% of a participant’s pre-tax compensation contributed to the Plan. For the year ended December 31, 2014 , the Company’s performance did not result in a match; however, the Compensation Committee approved a discretionary match for the maximum contribution of $2.7 million , which was contributed by issuing shares of the Company’s common stock to the employees’ accounts in February 2015. For the year ended December 31, 2013 , the Company’s performance resulted in a match for the full amount of $2.0 million , which was contributed to the employees’ accounts in cash in February 2014. For an eligible participant who has worked for the Company for less than four years at the time of the Company matching contribution, the contribution will vest in equal installments over four years based on the anniversary date of the participant’s employment. For an eligible participant who has worked for the Company for four or more years at the time of contribution, the contribution is 100% vested. For the year ended December 31, 2016, the Company anticipates matching up to 33% of the first 9% of a participant’s pre-tax compensation contributed to the Plan. Although the Company has not expressed any intent to terminate the Plan, it has the option to do so at any time subject to the provisions of the Employee Retirement Income Security Act of 1974. Upon termination of the Plan, either full or partial, participants become fully vested in their entire account balances.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The following table sets forth information regarding the United States and foreign components of income tax expense for 2015 , 2014 and 2013 (in thousands): Years Ended December 31, Current Deferred Total 2015 United States federal $ (291 ) $ 319 $ 28 State and local 517 35 552 Foreign jurisdiction 1,440 (646 ) 794 Total $ 1,666 $ (292 ) $ 1,374 2014 United States federal $ (3,920 ) $ 28,333 $ 24,413 State and local (594 ) (787 ) (1,381 ) Foreign jurisdiction 1,254 (414 ) 840 Total $ (3,260 ) $ 27,132 $ 23,872 2013 United States federal 3,735 (7,380 ) (3,645 ) State and local 587 (580 ) 7 Foreign jurisdiction 7,433 (222 ) 7,211 Total $ 11,755 $ (8,182 ) $ 3,573 The tax effects of temporary differences that gave rise to significant portions of the deferred tax assets at December 31, 2015 , 2014 and 2013 are presented below (in thousands): Years Ended December 31, 2015 2014 2013 Deferred tax assets: Allowance for doubtful accounts $ 478 $ 382 $ 293 Accrued expenses 3,154 4,244 4,144 Deferred revenues 9,300 14,125 13,442 Stock-based compensation expense 9,526 7,849 6,037 Depreciation and amortization expense 723 1,014 423 Tax net operating loss carryforwards 11,861 906 109 Foreign tax credit carryforwards 4,352 2,668 1,403 Research tax carryforwards 7,309 7,425 3,930 Valuation allowance (42,755 ) (33,555 ) (135 ) Total deferred tax assets 3,948 5,058 29,646 Deferred tax liabilities: Depreciation and amortization expense (98 ) (948 ) (1,287 ) Intangibles (5,844 ) (6,404 ) (6,957 ) Investments (149 ) (143 ) (143 ) Total deferred tax liabilities (6,091 ) (7,495 ) (8,387 ) Net deferred tax (liabilities) assets $ (2,143 ) $ (2,437 ) $ 21,259 In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon generation of future taxable income prior to the period in which temporary differences such as loss carryforwards and tax credits expire. Management considers the scheduled reversal of deferred tax liabilities, if any (including the impact of available carryback and carryforward periods), projected future taxable income and tax planning strategies in making this assessment. During the fourth quarter of 2014, the Company recorded deferred income tax expense of $33.4 million related to recording a valuation allowance to reduce a significant portion of the Company’s deferred tax assets. The Company has incurred cumulative tax losses in recent periods due to its business model shift to the cloud. Such tax losses may continue for a period of time. This deferred income tax expense reflected the Company’s assessment that it was more likely than not that the deferred tax assets would not be realizable in the foreseeable future. Therefore, the Company recorded a valuation allowance to reduce the carrying value of the deferred tax assets. During 2015, the Company increased the valuation allowance by $9.2 million . As a result, the valuation allowance as of December 31, 2015 and 2014 was $42.8 million and $33.6 million , respectively. The following table sets forth the items accounting for the difference between expected income tax expense compared to actual income tax expense recorded in the Company’s consolidated financial statements (in thousands): Years Ended December 31, 2015 2014 2013 Expected income tax expense at 35% tax rate $ (7,158 ) $ (6,123 ) $ 4,580 Permanent items (184 ) 485 612 State taxes, net of federal benefit 409 (634 ) 361 Disqualifying dispositions of stock options — (44 ) (353 ) Research tax credit (1,834 ) (2,487 ) (2,441 ) Prior year tax credit adjustment — — 702 Increase (decrease) in liabilities for uncertain tax positions 68 210 (35 ) Valuation allowance 9,201 33,420 135 Other 872 (955 ) 12 Income tax expense $ 1,374 $ 23,872 $ 3,573 During 2010, the Company utilized its remaining U.S. federal net operating losses generated from tax benefits related to the exercise of stock options. The Company had no tax benefits related to the exercise of stock options during 2015 and 2014. Tax benefits related to the exercise of stock options during 2013 were $13.5 million . The Company does not record a deferred tax asset on its balance sheet for the tax benefits from these deductions until they are realizable. At December 31, 2015 , the Company had approximately $13.6 million of foreign tax credits and federal and state research tax credit carryforwards available to offset taxes payable. The Company and its subsidiaries file federal income tax returns and income tax returns in various states and foreign jurisdictions. Tax years 2013 and forward remain open for examination for federal tax purposes and tax years 2011 and forward remain open for examination for the Company’s more significant state tax jurisdictions. To the extent utilized in future years’ tax returns, net operating loss and capital loss carryforwards at December 31, 2015 will remain subject to examination until the respective tax year is closed. Historically, the impact of foreign effective income tax rates on the Company’s overall effective income tax rates has been immaterial due to the fact that the Company uses a cost plus basis method for calculating taxes in the majority of the foreign tax jurisdictions in which the Company operates. A cost plus basis limits the taxes paid in these foreign jurisdictions to a markup of the costs that the Company incurs in these jurisdictions and is not tied to the actual revenues generated. A cost plus basis guarantees the foreign subsidiaries operating income whereas foreign subsidiary resellers are not guaranteed a profit margin. However, due to the Company switching certain of its existing foreign subsidiaries from cost plus to resellers entities, the foreign effective tax rate could become material in future years. As of December 31, 2015 , 2014 and 2013, the recorded foreign tax expense and the related effect on the income tax rates were $0.8 million , or 48.54% , $0.5 million , or 2.08% , and $6.8 million , or 190% , respectively. FASB ASC 740 prescribes a recognition threshold and measurement attributes for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. The Company has identified uncertain tax positions related to certain tax credits and certain state income tax apportionment that the Company currently believes meet the “more likely than not” recognition threshold to be sustained upon examination. The balance of the reserve was approximately $2.4 million and $2.3 million at December 31, 2015 and 2014, respectively. The Company accounts for uncertain income taxes under FASB ASC 740. The Company recognizes financial statement benefits for positions taken for tax return purposes when it is more likely than not that the position will be sustained. A reconciliation of the beginning and ending amount of the gross unrecognized tax benefits is as follows (in thousands): Years Ended December 31, 2015 2014 Unrecognized Tax Benefits at Beginning of Year $ 2,297 $ 2,087 Increase in balance due to current year tax position 551 439 Decrease in balance due to resolution of prior year tax position (483 ) (229 ) Unrecognized Tax Benefits at End of Year $ 2,365 $ 2,297 If recognized, the entire remaining balance of unrecognized tax benefits would impact the effective tax rate. We recognize interest income, interest expense and penalties relating to tax exposures as a component of income tax expense. As of December 31, 2015 , the unrecognized tax benefit of $2.4 million included no interest expense and penalties. As of December 31, 2014, the unrecognized tax benefit of $2.3 million included $27,000 of interest expense and penalties related to the above unrecognized tax benefits.

Segment And Geographic Disclosu

Segment And Geographic Disclosures	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
SEGMENT AND GEOGRAPHIC DISCLOSURES	SEGMENT AND GEOGRAPHIC DISCLOSURES In accordance with FASB ASC Topic 280, Segment Reporting , the Company views its operations and manages its business as principally one segment which is interaction management software solutions licensing and associated services. As a result, the financial information disclosed herein represents all of the material financial information related to the Company’s principal operating segment. Revenues derived from customers and partners located in the United States accounted for approximately 64% of the Company’s total revenues in each of 2015 and 2014 , and approximately 63% of the Company’s total revenues in 2013 . The remaining revenues are from customers and partners located in foreign countries and each individual foreign country accounted for less than 10% of total revenues in each of 2015 , 2014 and 2013 . The Company attributes revenues to countries based on the country in which the customer or partner is located. Additionally, as of December 31, 2015 and 2014 , the percentage of the Company’s net property and equipment, which included computer and office equipment, furniture and fixtures, leasehold improvements and data center equipment, that was located outside of the United States decreased to approximately 22% in 2015 from 24% in 2014 . No more than 10% of the Company’s net property and equipment was located in any individual foreign country as of December 31, 2015 and 2014 .

Commitments And Contingencies

Commitments And Contingencies	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Legal Proceedings From time to time, the Company has received notification from competitors and other technology providers claiming that the Company’s technology infringes their proprietary rights. The Company cannot provide assurance that these matters can be resolved amicably without litigation, or that the Company will be able to enter into licensing arrangements on terms and conditions that would not have a material adverse effect on its business, financial condition or results of operations. From time to time, the Company is also involved in certain legal proceedings in the ordinary course of conducting its business. While the ultimate liability pursuant to these actions cannot currently be determined, the Company believes these legal proceedings will not have a material adverse effect on its financial position or results of operations. Litigation in general, and intellectual property litigation in particular, can be expensive and disruptive to normal business operations. Moreover, the results of complex legal proceedings are difficult to predict. Guarantees The Company provides indemnifications of varying scope and amount to certain customers against claims of intellectual property infringement made by third parties arising from the use of its product and service offerings. The Company’s software license and subscription agreements include certain provisions for indemnifying customers, in material compliance with their license agreement, against liabilities if the Company’s software products or services infringe upon a third party's intellectual property rights, over the life of the agreement. There is no maximum potential amount of future payments set under the guarantee. However, the typical arrangement states that the Company may at any time and at its option and expense: (i) procure the right of the customer to continue to use the Company’s software or services that may infringe a third party’s rights; (ii) modify its software or services so as to avoid infringement; or (iii) require the customer to return its software or stop using the service and the Company will provide a refund to the customer depending on the type of offering (on-premises or cloud) used by such customer. The customer’s failure to provide timely notice or reasonable assistance will relieve the Company of its obligations under this indemnification to the extent that it has been actually and materially prejudiced by such failure. To date, the Company has not incurred, nor does it expect to incur, any material related costs and, therefore, has not reserved for such liabilities in accordance with FASB ASC Topic 460, Guarantees. The Company’s software license and subscription agreements also include a warranty that its software products and services will substantially conform to its software user documentation for a period of one year , provided the customer is in material compliance with the software license or subscription agreement. To date, the Company has not incurred any material costs associated with these product warranties, and as such, has not reserved for any such warranty liabilities in its operating results. Lease Commitments and Other Contingencies See Note 8 for further information on the Company’s lease commitments. Effective March 6, 2015, the Company entered into an agreement with Verint Americas Inc. ("Verint"), with an initial term of five years. Under the terms of the agreement, Verint granted to the Company limited rights to sell Verint product and the Company agreed to pay Verint license fees. If sales of Verint product are not maintained at levels as stated in the agreement, the Company could potentially owe Verint up to $5 million . No accrual has been recorded as of December 31, 2015, as the Company anticipates selling at least the minimum amounts of Verint product set forth in the agreement. The Company has received and may continue to receive certain payroll tax credits and real estate tax abatements that were granted to the Company based upon certain growth projections. If the Company’s actual results are less than those projections, the Company may be subject to repayment of some or all of the tax credits or payment of additional real estate taxes in the case of the abatements. The Company does not believe that it will be subject to payment of any money related to these taxes; however, the Company cannot provide assurance as to the outcome.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2015
Business Combinations [Abstract]
ACQUISITIONS	ACQUISITIONS OrgSpan Acquisition On May 14, 2014, the Company entered into a stock purchase agreement and acquired OrgSpan, Inc. ("OrgSpan"), a privately held provider of cloud-based enterprise social communications solutions. The Company purchased OrgSpan to leverage technology that will provide efficient deployment of the Company’s PureCloud Platform. As previously disclosed, Donald E. Brown, the Company’s Chairman of the Board, President and Chief Executive Officer, was a founder and majority stockholder of OrgSpan. The Company purchased OrgSpan for approximately $14.1 million , partially funded with cash on hand, which included the repayment of OrgSpan’s outstanding debt of approximately $8.0 million . OrgSpan’s outstanding debt consisted primarily of operating loans provided by Dr. Brown bearing interest at a rate of 4.25% per annum. Approximately $1.4 million in cash was paid to OrgSpan’s stockholders (other than Dr. Brown) and to holders of vested OrgSpan stock options. In exchange for his shares of OrgSpan stock, Dr. Brown has the right to receive an aggregate of 98,999 restricted shares of the Company’s common stock (the "Restricted Shares"), representing approximately $4.7 million of the purchase price, which Restricted Shares will vest and be issued by the Company upon the achievement of certain performance-based conditions tied to the launch and sales of the Company’s PureCloud Platform, which incorporates certain OrgSpan products and technology. The Restricted Shares will be unregistered. The difference between the $15.6 million purchase price previously disclosed in the Form 8-K filed on May 14, 2014 and the $14.1 million noted above is a result of the difference in the value of the 98,999 Restricted Shares received by Dr. Brown for accounting purposes. The Company also retained 38 OrgSpan employees as part of the transaction. The transaction was negotiated and approved by the Company's Audit Committee following its reassessment of the relationship between the Company and OrgSpan. The Audit Committee retained its own independent valuation consultant and its own independent counsel in connection with the reassessment. The committee’s valuation consultant subsequently provided the Audit Committee with a fairness opinion concerning the transaction. Following its approval, the Audit Committee recommended that the acquisition be approved by the Company's Board of Directors. The independent members of the Company's Board of Directors unanimously approved the transaction, with Dr. Brown recusing himself from all Board deliberations related to OrgSpan. With the first commercial release of its PureCloud Platform in June 2015, the Company met the first performance-based condition for the Restricted Shares set forth in the stock purchase agreement. As a result, the Company issued 32,999 of the Restricted Shares to Dr. Brown during July 2015, which shares were not registered under the Securities Act of 1933, as amended (the "Securities Act"), in reliance upon an exemption from registration provided by Section 4(a)(2) under the Securities Act. Any additional Restricted Shares issued to Dr. Brown will also be unregistered. The acquisition was accounted for using the acquisition method of accounting in accordance with FASB ASC Topic 805, Business Combinations ("FASB ASC 805"). The results of OrgSpan’s operations were included in the Company’s condensed consolidated financial statements commencing on the acquisition date. The purchase price allocations for the OrgSpan transaction were prepared by the Company’s management utilizing a third-party valuation report, which was prepared in accordance with the provisions of FASB ASC 805, and other tools available to the Company, including conversations with OrgSpan’s management and historical data from the Company’s other acquisitions. The following table summarizes the fair value of the intangible and other assets acquired and liabilities assumed at the date of the acquisition (in thousands): May 1, 2014 Cash and cash equivalents $ 61 Prepaid expenses 54 Property and equipment, net 144 Intangible assets, net 5,766 Goodwill 8,202 Total assets acquired 14,227 Accrued accounts payable (5 ) Other current liabilities (44 ) Other long-term liabilities (128 ) Net assets acquired $ 14,050 Professional fees related to this acquisition totaled $613,000 , and included transaction costs such as legal, accounting and valuation services, which were expensed as incurred. These costs are included within general and administrative expenses on the condensed consolidated statements of operations for the periods incurred. All of these costs were incurred and recognized during 2014. The premium paid over the fair value of the net assets acquired in the purchase, or goodwill, was primarily attributed to OrgSpan’s existing trained workforce. The goodwill is expected to be deductible for tax purposes, as the Company made a Section 338(h)(10) election for this acquisition. Intangible assets acquired resulting from this acquisition consisted of technology, which is amortized on a straight-line basis. The following sets forth the current net book value of technology acquired and its original economic useful life (dollars in thousands): As of December 31, 2015 Gross Amount Accumulated Amortization Net Amount Economic Useful Life (in years) Technology $ 5,766 $ 961 $ 4,805 10 Pro Forma Results The Company has not furnished pro forma financial information related to its acquisition of OrgSpan because such information is not material individually or in the aggregate to the overall financial results of the Company. Goodwill and Other Intangible Assets The following table presents a roll forward of goodwill as of December 31, 2015 (in thousands): Balance as of December 31, 2014 $ 43,732 Foreign currency adjustment (2,243 ) Other 359 Balance as of December 31, 2015 $ 41,848

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVES	DERIVATIVES The Company enters into derivative contracts to mitigate its foreign currency risk associated with transacting business internationally. The Company uses foreign currency forward contracts to hedge the revaluation exposure of its net monetary assets and liabilities including cash, accounts receivable, accounts payable and certain intercompany payables and receivables. These hedges are undesignated and all realized and unrealized gains and losses are recorded as incurred within other income (expense) on the Company’s consolidated statements of operations. The objective is to offset the gains and losses on the underlying exposures with the gains and losses from the forward contracts. The Company’s hedging policy prohibits entering into hedge contracts that are speculative in nature. The Company records the fair value of its outstanding hedge contracts in other current assets and accrued liabilities depending upon the market value of the forward contracts at each balance sheet date. The following table summarizes the notional amount and fair value of the Company’s outstanding currency contracts at December 31, 2015 and December 31, 2014 , respectively. USD Equivalent Notional Amount (000's) December 31, December 31, Euro $ 3,275 $ 3,041 Japanese Yen 1,495 — US Dollar 150 600 South African Rand 347 — Swedish Krona — 249 Australian Dollar — 738 Total $ 5,267 $ 4,628 Fair Value USD (1) (000's) December 31, December 31, Derivative asset $ 32 $ 17 ___________ (1) The fair value measurement of these derivative contracts falls within Level 2 of the fair value hierarchy as defined in FASB ASC 820. See Note 3 - Investments for further information. During the years ended December 31, 2015 and 2014 , the Company recorded hedging gains of $498,000 and $102,000 , respectively.

Convertible Notes

Convertible Notes	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
CONVERTIBLE NOTES	In May 2015, the Company issued $150.0 million aggregate principal amount of its Notes due June 1, 2020, unless earlier purchased by the Company or converted. Interest is payable semi-annually, in arrears, on June 1 and December 1 of each year, and the Company made the first interest payment on December 1, 2015. The Notes were sold in a private placement under a purchase agreement entered into by and among the Company and Morgan Stanley & Co. LLC, J.P. Morgan Securities LLC and RBC Capital Markets, LLC, as representatives of the several initial purchasers named therein, for resale to qualified institutional buyers as defined in, and in reliance on, Rule 144A under the Securities Act. The Notes are governed by an indenture between the Company, as issuer, and U.S. Bank National Association, as trustee (the "indenture"). The Notes are unsecured and do not contain any financial covenants or any restrictions on the payment of dividends or the incurrence of senior debt or other indebtedness. If converted, holders of the Notes will receive, at the Company's election, cash, shares of the Company's common stock, or a combination of cash and shares. The initial conversion terms are as follows: Initial Conversion Rate per $1,000 Principal Amount Initial Conversion Price per Share 1.25% Convertible Senior Notes 16.3303 $ 61.24 Throughout the term of the Notes, the conversion rate may be adjusted upon the occurrence of certain events. Except for certain circumstances set forth in the indenture, holders of the Notes will not receive any cash payment representing accrued and unpaid interest upon conversion of a Note. Accrued but unpaid interest will be deemed to be paid in full upon conversion rather than canceled, extinguished or forfeited. Holders may convert the Notes under the following circumstances: • during any calendar quarter commencing after the calendar quarter ending on September 30, 2015 (and only during such calendar quarter), if the last reported sale price of the Company's common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; • during the five business day period after any five consecutive trading day period (the ‘‘measurement period’’) in which the trading price (as defined below) per $1,000 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company's common stock and the conversion rate on each such trading day; • upon the occurrence of specified corporate transactions pursuant to the indenture; or • at any time on or after March 3, 2020. Holders of the Notes have the right to require the Company to repurchase for cash all or a portion of the Notes prior to maturity upon the occurrence of a fundamental change, including, among other things, a change of control, at a purchase price equal to 100% of the principal amount of the Notes to be repurchased plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date. In addition, following certain corporate transactions that constitute a fundamental change, the Company is required to increase the conversion rate for a holder who elects to convert the Notes in connection with such change of control. In connection with the pricing of the Notes, the Company entered into capped call transactions. The capped call transactions cover, subject to anti-dilution adjustments substantially similar to those applicable to the Notes, the number of shares of the Company's common stock that underlie the Notes. The Company used approximately $12.8 million of the net proceeds from the issuance of the Notes to pay the cost of the capped call transactions. The strike price of the purchased call option is the same as the initial conversion price per share of the Notes of $61.24 . The capped call transactions have an initial cap price of $79.38 per share. These capped call transactions are recorded within equity on the condensed consolidated balance sheet as of December 31, 2015 and are not remeasured as long as they continue to meet the conditions for equity classification. In accounting for the issuances of the Notes, the Company separated the Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the Notes as a whole. The excess of the principal amount of the liability component over its carrying amount ("convertible notes discount") is amortized to interest expense over the term of the Notes using the effective interest rate method. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. Par Value Outstanding Equity Component Recorded at Issuance Liability Component of Par Value as of (In thousands) December 31, 2015 December 31, 2014 1.25% Convertible Senior Notes $ 150,000 $ 31,756 (1) $ 118,022 $ — ___________ (1) This amount represents the equity component recorded at the initial issuance of the Notes. In accounting for the transaction costs related to the issuance of the Notes, the Company allocated the total amount incurred to the liability and equity components based on their relative values. Transaction costs attributable to the liability component are being amortized to expense using the effective interest rate method over the term of the Notes, and transaction costs attributable to the equity component were netted with the equity component in shareholders’ equity. The Notes consisted of the following (in thousands): As of December 31, 2015 December 31, 2014 Liability component: 1.25% Convertible Senior Notes (1) $ 150,000 $ — Less: convertible notes discount, net (2) (28,554 ) — Less: convertible notes issuance costs (2) (3,424 ) — Net carrying amount $ 118,022 $ — ___________ (1) The effective interest rate of the Notes is 6.25% . The interest rate is based on the interest rates of similar liabilities at the time of issuance that did not have an associated convertible feature. (2) Included in the consolidated balance sheet as of December 31, 2015 within convertible notes and is amortized over the term of the Notes using the effective interest rate method. The total estimated fair value of the Notes at December 31, 2015 was $124.7 million . The fair value was determined based on inputs that are observable in the market (Level 2) and was based on the closing trading price per $100 of the Notes as of the last day of trading for the fourth quarter of 2015. Based on the closing price of the Company’s common stock of $31.42 on December 31, 2015 , the if-converted value of the Notes fell below the principal amount by approximately $73.0 million . Based on the terms of the Notes, the Notes were not convertible at any time during the year ended December 31, 2015 .

Recently Issued Accounting Pron

Recently Issued Accounting Pronouncements	12 Months Ended
	Dec. 31, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS	RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS In May 2014, the FASB issued FASB ASU No. 2014-9, Revenue from Contracts with Customers ("FASB ASU 2014-9"), which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. FASB ASU 2014-9 will replace most existing U.S. GAAP revenue recognition guidance when it becomes effective. As originally issued, the new standard was to become effective for the Company on January 1, 2017, and early adoption is not permitted. In August 2015, the FASB issued FASB ASU No. 2015-14, Deferral of the Effective Date , which declared a one-year deferral of the effective date of the new revenue recognition standard. As a result, the new standard will become effective for the Company beginning with the first quarter of 2018. FASB ASU 2014-9 permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that FASB ASU 2014-9 will have on its consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has it determined the effect of the guidance on its ongoing financial reporting. In April 2015, the FASB issued FASB ASU No. 2015-03, Simplifying the Presentation of Debt Issuance Costs ("FASB ASU 2015-03"), which requires an entity to present debt issuance costs on the balance sheet as a direct deduction from the debt liability instead of presenting the debt issuance costs as a separate asset. Public business entities must apply the new requirements in fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. All entities have the option of adopting the new requirements as of an earlier date for financial statements that have not been previously issued. The Company elected to early adopt FASB ASU 2015-03 in the second quarter of 2015 and has presented debt issuance costs as a direct deduction from the long-term debt liability in the accompanying balance sheet as of December 31, 2015. In April 2015, the FASB issued FASB ASU No. 2015-05, Customer's Accounting for Fees Paid in a Cloud Computing Arrangement ("FASB ASU 2015-05") , which clarifies that if a cloud computing arrangement includes a software license, the customer should account for the license consistent with its accounting for other software licenses. If the arrangement does not include a software license, the customer should account for the arrangement as a service contract. Public business entities must apply the new requirement in fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. An entity can elect to adopt the amendments either prospectively for all arrangements entered into or materially modified after the effective date, or retrospectively. Early adoption is permitted for all entities. The Company has elected to adopt the amendments prospectively for all arrangements entered into or materially modified after the effective date, which may result in the reclassification of certain cloud computing arrangements from prepaids to fixed assets on the consolidated balance sheet. In November 2015, the FASB issued FASB ASU No. 2015-17, Balance Sheet Classification of Deferred Taxes ("FASB ASU 2015-17"), which requires an entity to present deferred tax assets and liabilities as noncurrent on the balance sheet. Public business entities must apply the new requirements in fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. All entities have the option of adopting the new requirements as of an earlier date for financial statements that have not been previously issued. The Company elected to early adopt FASB ASU 2015-17 in the fourth quarter of 2015 and has presented its deferred taxes as noncurrent in the accompanying balance sheets as of December 31, 2015.

Unaudited Selected Quarterly Fi

Unaudited Selected Quarterly Financial Data	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
UNAUDITED SELECTED QUARTERLY FINANCIAL DATA	UNAUDITED SELECTED QUARTERLY FINANCIAL DATA The following selected quarterly data should be read in conjunction with "Management’s Discussion and Analysis of Financial Condition and Results of Operations" in Item 7 of this Annual Report on Form 10-K. This information has been derived from unaudited consolidated financial statements of the Company that, in management’s opinion, reflect all recurring adjustments necessary to fairly present the Company’s financial information when read in conjunction with its consolidated financial statements and notes thereto. The results of operations for any quarter are not necessarily indicative of the results to be expected for any future period (in thousands, except per share amounts): 2015 Quarter Ended Mar. 31, June 30, Sep. 30, Dec. 31, Total revenues $ 89,475 $ 96,331 $ 97,369 $ 107,687 Gross profit 52,951 59,012 58,648 66,631 Operating loss (4,771 ) (3,761 ) (6,182 ) (698 ) Net loss (3,459 ) (5,084 ) (9,752 ) (3,532 ) Net loss per share: Basic (0.16 ) (0.24 ) (0.45 ) (0.16 ) Diluted (0.16 ) (0.24 ) (0.45 ) (0.16 ) Shares used to compute net loss per share: Basic 21,447 21,504 21,664 21,732 Diluted 21,447 21,504 21,664 21,732 2014 Quarter Ended Mar. 31, June 30, Sep. 30, Dec. 31, Total revenues $ 79,448 $ 79,830 $ 89,462 $ 92,556 Gross profit 48,040 46,520 53,987 56,687 Operating (loss) income (4,813 ) (11,513 ) (3,464 ) 2,011 Net loss (1) (2,564 ) (6,798 ) (2,143 ) (29,862 ) Net loss per share: Basic (0.12 ) (0.33 ) (0.10 ) (1.42 ) Diluted (0.12 ) (0.33 ) (0.10 ) (1.42 ) Shares used to compute net loss per share: Basic 20,689 20,851 20,904 21,015 Diluted 20,689 20,851 20,904 21,015 _____ (1) During the fourth quarter of 2014, the Company recorded $33.4 million of deferred tax expense for a valuation allowance on deferred tax assets.

Valuation And Qualifying Accoun

Valuation And Qualifying Accounts	12 Months Ended
	Dec. 31, 2015
Valuation and Qualifying Accounts [Abstract]
Valuation And Qualifying Accounts	Interactive Intelligence Group, Inc. Schedule II – Valuation and Qualifying Accounts For the Years Ended December 31, 2015 , 2014 and 2013 (in thousands) Description Balance at Beginning of Period Charged to Revenue and Expenses, net Reduction of Allowance (1) Balance at End of Period Allowance for doubtful accounts receivable: 2015 $ 1,052 $ 745 $ 289 $ 1,508 2014 1,233 322 503 1,052 2013 1,584 132 483 1,233 _____ (1) Uncollectible accounts written off, net of recoveries.

Summary Of Significant Accoun26

Summary Of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
Accounting Changes and Error Corrections [Abstract]
Principles of Consolidation	Principles of Consolidation The accompanying consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after elimination of all significant intercompany accounts and transactions.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. On an on-going basis, management reevaluates these estimates including those related to revenue recognition, allowance for doubtful accounts, stock-based compensation, research and development, legal, goodwill and intangible assets, other assets and accounting for income taxes. Despite management’s best effort to establish good faith estimates and assumptions, actual results could differ from these estimates.
Revenue Recognition	Revenue Recognition The Company reports three types of revenues: recurring revenues, license and hardware revenues and services revenues. Recurring revenues are generated by fees from the Company’s cloud offerings and annual support fees from on-premises license agreements. License and hardware revenues are generated from licensing the right to use its software products on-premises and, in certain instances, selling hardware as a component of the product offering. Services revenues are generated primarily from professional services and educational services fees. Revenues are generated by direct sales to customers and by indirect sales through the Company’s partner channels.
Recurring Revenues	Recurring Revenues The Company generates recurring revenues from its cloud offerings and annual support fees. The Company's single-tenant and some of its multi-tenant cloud customers pay a minimum monthly fee to use a specified number of software licenses, plus any overages above the minimum. Customers are generally billed the greater of their minimum monthly fee or actual usage, and revenues are recognized monthly as services are delivered. Other multi-tenant cloud customers have signed month-to-month contracts and are billed monthly for actual usage. This revenue is recognized monthly as services are delivered. The total contract fee also includes an implementation fee, which is recognized ratably over the term of the contract. The Company recognizes annual support fees as recurring revenues ratably over the post-contract support period, which is typically 12 months , but may extend up to three years if prepaid.
Product Revenue	License and Hardware Revenues For any revenues to be recognized from a perpetual license agreement, the following criteria must be met: • Persuasive evidence of an arrangement exists; • The fee is fixed or determinable; • Collection is probable; and • Delivery has occurred. Upon meeting the revenue recognition criteria above, the Company immediately recognizes as license and hardware revenues the residual amount of the total contract fees if sufficient vendor specific objective evidence (“VSOE”) of fair value exists to support allocating a portion of the total fee to the undelivered elements of the arrangement. If sufficient VSOE of fair value for the undelivered product support does not exist, the Company recognizes the initial license fee as license and hardware revenues ratably over the initial term of the support agreement once support is the only undelivered element. The support period is generally 12 months but may be up to 18 months for initial sales because support begins when the licenses are downloaded, when support commences or no more than six months following the contract date. If the contract includes prepaid support, the support period may be up to 36 months . The Company determines VSOE of fair value for support in on-premises agreements based on substantive renewal rates the customer must pay to renew the support. The VSOE of fair value for other services is based on amounts charged when the services are sold in stand-alone sales. The Company sells hardware manufactured by third parties, which does not contain the Company’s software, and certain appliances, including the Interactive EDGE, Interaction Gateway and Interaction Media Server, which combine third-party hardware and the Company’s Interaction Gateway or Interaction Media Server software. These appliances are not pre-loaded with the Company’s Customer Interaction Center ("CIC") software and the Company does not require its customers to purchase these items directly from them. The Company’s CIC software will still function properly on hardware, gateways or media servers purchased from other vendors. Although the appliances mentioned above are a combination of hardware and software, the software does not primarily work together with the hardware to provide the hardware’s essential functionality. In addition, the Interaction Media Server software can be purchased separately and loaded onto other media servers the customer already owns or purchased from another vendor. The Company recognizes revenues related to hardware sales when the hardware is delivered and all other revenue recognition criteria are met. Contracts that contain both software and hardware are reviewed to allocate the deliverables into separate units of accounting in accordance with Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") Topic 605-25, Revenue Recognition – Multiple Element Arrangements ("FASB ASC 605-25"). The units of accounting fall into one of two categories: software or non-software related products. FASB ASC 605-25 is used to allocate the fair value of each.
Service Revenues	Services Revenues The Company generates revenues from other services that it provides to its customers and partners including fees for professional services and educational services. Revenues from professional services, which include implementing the Company’s product offerings and subsequent services engagements and educational services, which consist of training courses for customers and partners, are recognized as the related services are performed.
Accounts Receivable and Allowance for Doubtful Accounts Receivable	Accounts Receivable and Allowance for Doubtful Accounts Receivable Trade accounts receivable are recorded at the invoiced amount. The allowance for doubtful accounts is the Company’s best estimate of the amount of probable credit losses in the Company’s existing accounts receivable. The Company estimates bad debt expense based on a percentage of revenue reported and a detailed analysis of receivables each period. The Company reviews the allowance for doubtful accounts each reporting period based on a detailed analysis of its accounts receivable. In the analysis, the Company primarily considers the age of the customer’s or partner’s receivable and also considers the creditworthiness of the customer or partner, the economic conditions of the customer’s or partner’s industry and general economic conditions, among other factors. If any of these factors change, the Company may also change its original estimates, which could impact the level of its future allowance for doubtful accounts. If payment is not made timely, the Company will contact the customer or partner to try to obtain the payment. If this is not successful, the Company will institute other collection practices such as generating collection letters, charging interest, involving sales personnel and ultimately terminating the customer’s or partner’s access to future upgrades, licenses or services and technical support. Once all collection efforts are exhausted, the receivable is written off against the allowance for doubtful accounts.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all highly liquid investments with a maturity of three months or less from date of purchase to be cash equivalents. Cash and cash equivalents consist primarily of cash on deposit with financial institutions and high quality money market instruments.
Investments	Investments The Company’s investments, which consist primarily of taxable corporate and government debt securities, are classified as available-for-sale. Such investments are recorded at fair value and unrealized gains and losses are excluded from earnings and recorded as a separate component of equity until realized. Premiums or discounts are amortized or accreted over the life of the related security as an adjustment to yield using the effective interest method. Realized gains and losses from the sale of available-for-sale securities are determined on a specific identification basis. A decline in the market value of securities below cost judged to be other than temporary results in a reduction in the carrying amount to fair value. The impairment is charged to earnings and a new cost basis for the security is established. Interest and dividends on all securities are included in interest income when earned.
Property and Equipment	Property and Equipment Property and equipment are stated at cost. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized using the straight-line method over the lesser of the term of the related lease or the estimated useful life. The Company leases its office space under operating lease agreements. In accordance with FASB ASC Topic 840, Leases ("FASB ASC 840"), for operating leases with escalating rent payments, the Company records rent expense on a straight-line basis over the life of the lease.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets In accordance with FASB ASC Topic 360, Property, Plant and Equipment, certain of the Company’s assets, such as property and equipment and intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized for the amount by which the carrying amount of the asset exceeds the fair value of the asset.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets The Company reviews goodwill and intangible assets with indefinite lives for impairment at least annually in accordance with FASB Accounting Standards Update ("ASU") 2011-8, Testing Goodwill for Impairment ("FASB ASU 2011-8") , which amends FASB ASC Topic 350, Intangibles – Goodwill and Other ("FASB ASC 350"). This guidance requires the Company to perform the goodwill impairment analysis annually or when a change in facts and circumstances indicates that the fair value of an asset may be below its carrying amount. Application of goodwill impairment testing involves judgment, including but not limited to, the identification of reporting units and estimation of the fair value of each reporting unit. A reporting unit is defined as an operating segment or one level below an operating segment. The Company tests goodwill at the operating segment level as it has determined that the characteristics of the reporting units within its operating segment are similar and allow for their aggregation in accordance with the applicable accounting guidance.
Advertising	Advertising The Company expenses all advertising costs as incurred.
Research and Development	Research and Development Research and development expenditures for the Company’s on-premises and single-tenant cloud offerings are generally expensed as incurred. FASB ASC Topic 985, Software , requires capitalization of certain software development costs subsequent to the establishment of technological feasibility. Based on the Company’s product development process, technological feasibility is established upon completion of a working model. Historically, costs incurred by the Company between completion of the working model and the point at which the product is ready for general release have been insignificant as it related to our on-premises and single-tenant cloud offerings.
Stock-Based Compensation	Stock-Based Compensation Consistent with FASB ASC Topic 718, Compensation – Stock Compensation ("FASB ASC 718"), the Company uses the Black-Scholes option-pricing model as its method of valuation for stock option awards. The Company’s determination of fair value of stock option awards on the date of grant using the Black-Scholes option-pricing model is affected by the Company’s stock price as well as assumptions regarding a number of highly complex and subjective variables. These variables include, but are not limited to, the Company’s expected stock price volatility over the expected term of the awards and an expected risk-free rate of return. If factors change and the Company uses different assumptions for estimating stock-based compensation expense associated with awards granted in future periods, stock-based compensation expense may differ materially in the future from that recorded in the current period.
Fair Value Measurements	Fair Value Measurements The carrying amounts of the Company’s financial instruments, including cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities, approximate their respective fair market values due to the short maturities of these financial instruments. The fair values of short-term and long-term investments are valued in accordance with FASB ASC Topic 820, Fair Value Measurements and Disclosures ("FASB ASC 820").
Income Taxes	Income Taxes Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. FASB ASC Topic 740, Income Taxes ("FASB ASC 740"), establishes financial accounting and reporting standards for the effect of income taxes. The Company is subject to income taxes in both the United States and numerous foreign jurisdictions. Significant judgment is required in evaluating the Company’s tax positions and determining its provision for income taxes. The objectives of accounting for income taxes are to recognize the amount of taxes payable or refundable for the current year and deferred tax liabilities and assets for the future tax consequences of events that have been recognized in an entity’s financial statements or tax returns. Variations in the actual outcome of these future tax consequences could materially impact the Company’s financial position, results of operations or cash flows. In assessing the recoverability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon generation of future taxable income prior to the period in which temporary differences such as loss carryforwards and tax credits expire. Management considers the scheduled reversal of deferred tax liabilities, if any (including the impact of available carryback and carryforward periods), projected future taxable income and tax planning strategies in making this assessment. During the fourth quarter of 2014, the Company recorded deferred income tax expense of $33.4 million related to recording a valuation allowance to reduce a significant portion of the Company’s deferred tax assets. The Company has incurred cumulative tax losses in recent periods due to its business model shift to the cloud. Such tax losses may continue for a period of time. This deferred income tax expense reflects the Company’s assessment that it is more likely than not that the deferred tax assets will not be realizable in the foreseeable future. As of December 31, 2015 , the Company had $13.6 million in tax credit carryforwards recorded as deferred tax assets as well as a valuation allowance of $42.8 million . The Company will continue to evaluate the valuation of deferred tax assets in accordance with the requirements of FASB ASC 740. See Note 10 for further information on the Company’s income taxes. The revenue from sales tax collected from customers is recorded on a net basis.
Net Income per Share	Net (Loss) Income per Share Basic net (loss) income per share is calculated based on the weighted-average number of common shares outstanding in accordance with FASB ASC Topic 260, Earnings per Share . Diluted net income per share is calculated based on the weighted-average number of common shares outstanding plus the effect of dilutive potential common shares. When the Company reports a net loss, the calculation of diluted net loss per share excludes potential common shares as the effect would be anti-dilutive. Potential common shares are composed of shares of common stock issuable upon the exercise of stock options and vesting of restricted stock units ("RSUs"). The calculation of diluted net income per share excludes shares underlying stock options outstanding that would be anti-dilutive.
Comprehensive Income	Comprehensive (Loss) Income Comprehensive (loss) income is comprised of net (loss) income and other comprehensive (loss) income. The Company reports unrealized gains (losses) on marketable securities and foreign currency translation adjustments as other comprehensive (loss) income.
Legal Proceedings	Legal Proceedings Liabilities for loss contingencies arising from claims, assessments, litigation, fines, penalties and other sources are recorded when it is probable that a liability has been incurred and the amount of the assessment and/or remediation can be reasonably estimated. Legal costs incurred in connection with loss contingencies are expensed as incurred.
Internal Use Software	Internal Use Software The Company capitalizes certain costs related to its PureCloud Platform and certain projects described below for internal use in accordance with FASB ASC 350-40, Internal Use Software. Once a product has reached the development stage, internal and external costs, if direct and incremental, are capitalized until the software is substantially complete and ready for its intended use. The capitalization of costs ceases upon completion of all substantial testing. Costs incurred in the preliminary stages of development, maintenance and training costs are expensed as incurred. During the years ended December 31, 2015 and 2014, the Company capitalized $12.7 million and $16.9 million , respectively, of costs related to the development of its PureCloud Platform. The Company will continue to capitalize development costs related to new PureCloud offerings and will begin amortizing such costs once those offerings are released for general availability. The Company also capitalizes costs related to implementing new business systems to meet its internal business needs. The Company has no substantive plans to market such software externally.
Recently issued accounting pronouncements	RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS In May 2014, the FASB issued FASB ASU No. 2014-9, Revenue from Contracts with Customers ("FASB ASU 2014-9"), which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. FASB ASU 2014-9 will replace most existing U.S. GAAP revenue recognition guidance when it becomes effective. As originally issued, the new standard was to become effective for the Company on January 1, 2017, and early adoption is not permitted. In August 2015, the FASB issued FASB ASU No. 2015-14, Deferral of the Effective Date , which declared a one-year deferral of the effective date of the new revenue recognition standard. As a result, the new standard will become effective for the Company beginning with the first quarter of 2018. FASB ASU 2014-9 permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that FASB ASU 2014-9 will have on its consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has it determined the effect of the guidance on its ongoing financial reporting. In April 2015, the FASB issued FASB ASU No. 2015-03, Simplifying the Presentation of Debt Issuance Costs ("FASB ASU 2015-03"), which requires an entity to present debt issuance costs on the balance sheet as a direct deduction from the debt liability instead of presenting the debt issuance costs as a separate asset. Public business entities must apply the new requirements in fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. All entities have the option of adopting the new requirements as of an earlier date for financial statements that have not been previously issued. The Company elected to early adopt FASB ASU 2015-03 in the second quarter of 2015 and has presented debt issuance costs as a direct deduction from the long-term debt liability in the accompanying balance sheet as of December 31, 2015. In April 2015, the FASB issued FASB ASU No. 2015-05, Customer's Accounting for Fees Paid in a Cloud Computing Arrangement ("FASB ASU 2015-05") , which clarifies that if a cloud computing arrangement includes a software license, the customer should account for the license consistent with its accounting for other software licenses. If the arrangement does not include a software license, the customer should account for the arrangement as a service contract. Public business entities must apply the new requirement in fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. An entity can elect to adopt the amendments either prospectively for all arrangements entered into or materially modified after the effective date, or retrospectively. Early adoption is permitted for all entities. The Company has elected to adopt the amendments prospectively for all arrangements entered into or materially modified after the effective date, which may result in the reclassification of certain cloud computing arrangements from prepaids to fixed assets on the consolidated balance sheet. In November 2015, the FASB issued FASB ASU No. 2015-17, Balance Sheet Classification of Deferred Taxes ("FASB ASU 2015-17"), which requires an entity to present deferred tax assets and liabilities as noncurrent on the balance sheet. Public business entities must apply the new requirements in fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. All entities have the option of adopting the new requirements as of an earlier date for financial statements that have not been previously issued. The Company elected to early adopt FASB ASU 2015-17 in the fourth quarter of 2015 and has presented its deferred taxes as noncurrent in the accompanying balance sheets as of December 31, 2015.

Summary Of Significant Accoun27

Summary Of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2015
Accounting Changes and Error Corrections [Abstract]
Calculation Of Basic And Diluted Net Income Per Share	The following table sets forth the calculation of basic and diluted net income (loss) per share (in thousands, except per share amounts): Years Ended December 31, 2015 2014 2013 Net (loss) income, as reported (A) $ (21,827 ) $ (41,367 ) $ 9,515 Weighted average shares of common stock outstanding (B) 21,609 20,930 20,033 Dilutive effect of employee stock options and RSUs — — 1,055 Common stock and common stock equivalents (C) 21,609 20,930 21,088 Net (loss) income per share: Basic (A/B) $ (1.01 ) $ (1.98 ) $ 0.47 Diluted (A/C) (1.01 ) (1.98 ) 0.45

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Financial Assets Measured At Fair Value	The following table sets forth a summary of the Company’s financial assets, classified as cash and cash equivalents, short-term investments and long-term investments on its condensed consolidated balance sheet, measured at fair value as of December 31, 2015 and 2014 (in thousands): Fair Value Measurements at December 31, 2015 Using Description Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Cash & cash equivalents: Cash $ 91,974 $ 91,974 $ — $ — Money market funds 2,834 2,834 — — Total $ 94,808 $ 94,808 $ — $ — Short-term investments: Corporate notes $ 27,105 $ — $ 27,105 $ — Agency bonds 27,002 — 27,002 — Asset-backed securities 4,681 — 4,681 — U.S. government securities 3,896 — 3,896 — Commercial paper 1,498 — 1,498 — Total $ 64,182 $ — $ 64,182 $ — Long-term investments: Corporate notes $ 29,504 $ — $ 29,504 $ — Asset-backed securities 999 — 999 — Total $ 30,503 $ — $ 30,503 $ — Fair Value Measurements at December 31, 2014 Using Description Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Cash & cash equivalents: Cash $ 34,452 $ 34,452 $ — $ — Money market funds 1,716 1,716 — — Total $ 36,168 $ 36,168 $ — $ — Short-term investments: Corporate notes $ 19,241 $ — $ 19,241 $ — Commercial paper 800 — 800 — Total $ 20,041 $ — $ 20,041 $ — Long-term investments: U.S. government securities $ 1,000 $ 1,000 $ — $ — Corporate notes 4,495 — 4,495 — Total $ 5,495 $ 1,000 $ 4,495 $ —

Property And Equipment (Tables)

Property And Equipment (Tables)	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Summary Of Property And Equipment	Property and equipment are summarized as follows as of December 31, 2015 and 2014 (in thousands): 2015 2014 Computer equipment $ 25,050 $ 25,905 Leasehold improvements 22,898 21,103 Furniture and fixtures 12,982 12,719 Data center equipment 35,934 27,800 Software 3,261 2,956 Office equipment 1,467 2,198 Trade show equipment and other 924 929 Construction in process 4,256 1,627 Capital lease assets 1,372 — Total property and equipment 108,144 95,237 Less accumulated depreciation (63,307 ) (50,452 ) Net property and equipment $ 44,837 $ 44,785

Capitalized Software (Tables)

Capitalized Software (Tables)	12 Months Ended
	Dec. 31, 2015
Research and Development [Abstract]
Schedule of Capitalized Software	Capitalized software is summarized as follows as of December 31, 2015 and 2014 (in thousands): 2015 2014 Capitalized internal-use software development costs related to PureCloud Platform, net of accumulated amortization of $3,928 and $0, respectively $ 29,275 $ 20,448 Capitalized internal-use software development costs related to internal business systems, net of accumulated amortization of $5,443 and $3,258, respectively 8,060 6,337 Acquired developed technology, net of accumulated amortization of $1,557 and $1,161, respectively 6,448 6,813 $ 43,783 $ 33,598

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Allocation of Stock-Based Compensation Expense	The following table summarizes the allocation of stock-based compensation expense related to employee and director stock options and RSUs under FASB ASC 718 for the years ended December 31, 2015 , 2014 and 2013 (in thousands): Years Ended December 31, 2015 2014 2013 Stock-based compensation expense by category: Costs of recurring revenues $ 1,828 $ 1,345 $ 806 Costs of services revenues 717 432 245 Sales and marketing 3,959 4,077 3,109 Research and development 5,273 4,027 2,733 General and administrative 4,386 3,378 2,354 Total stock-based compensation expense $ 16,163 $ 13,259 $ 9,247 Effect of stock-based compensation expense on net income (loss) per share: Basic $ (0.75 ) $ (0.63 ) $ (0.46 ) Diluted (0.75 ) (0.63 ) (0.44 )
Schedule Of Grant Date Fair Value	After taking into account the options that were cancelled during 2015 , 2014 and 2013 , the estimated total grant date fair value, not accounting for estimated forfeitures, is as follows (in thousands): Number of Options Granted Number of Options Cancelled Grant Date Fair Value Year: 2015 — — $ — 2014 271 101 7,068 2013 275 46 4,521
Schedule of Valuation Assumptions	The weighted-average estimated per option value of non-performance-based and performance-based options granted under the 2006 Plan during the years ended December 31, 2014 and 2013 was $31.38 and $17.99 , respectively, using the following assumptions: Years Ended December 31, Valuation assumptions for non-performance-based options: 2014 2013 Dividend yield — % — % Expected volatility 60.41 % 54.36 - 54.44% Risk-free interest rate 1.38 % 1.04 - 1.12% Expected life of option (in years) 4.00 4.25 Years Ended December 31, Valuation assumptions for performance-based options: 2014 2013 Dividend yield — % — % Expected volatility 59.76 % 57.56 % Risk-free interest rate 1.51 % 0.73 % Expected life of option (in years) 4.50 4.75 Years Ended December 31, Valuation assumptions for annual director options: 2014 2013 Dividend yield — % — % Expected volatility 61.70 % 49.33 % Risk-free interest rate 1.17 % 0.54 % Expected life of option (in years) 4.00 3.50
Summary of Stock Option Activity	The following table sets forth a summary of stock option activity for the years ended December 31, 2015 , 2014 and 2013 : Years Ended December 31, 2015 2014 2013 Options Weighted- Average Exercise Price Options Weighted- Average Exercise Price Options Weighted- Average Exercise Price Balances, beginning of year 1,350,799 $ 32.95 1,852,620 $ 22.25 2,631,198 $ 17.21 Options granted — — 225,250 63.15 251,250 41.91 Options exercised (251,464 ) 18.74 (672,321 ) 12.79 (1,007,578 ) 14.00 Options cancelled, forfeited or expired (38,477 ) 45.88 (54,750 ) 42.73 (22,250 ) 20.98 Options outstanding at end of year 1,060,858 35.85 1,350,799 32.95 1,852,620 22.25 Option price range at end of year $ 6.66 - 66.39 $ 6.66 - 66.39 $ 3.53 - 66.21 Weighted-average fair value of options granted $ — $ 31.38 $ 17.99 Options exercisable at end of year 767,052 31.92 723,801 24.98 1,010,495 15.53
Summary of Stock Options Outstanding and Exercisable	The following table sets forth information regarding the Company’s stock options outstanding and exercisable at December 31, 2015 : Options Outstanding Options Exercisable Range of Exercise Prices Number Weighted- Average Remaining Contractual Life Weighted- Average Exercise Price Number Weighted- Average Exercise Price $ 6.66 — $ 19.66 147,725 0.41 $ 18.11 147,725 $ 18.11 19.77 — 22.92 3,400 1.39 21.76 2,150 21.09 24.50 — 24.50 224,379 2.22 24.50 154,379 24.50 25.00 — 30.92 62,750 2.30 27.07 53,000 26.87 32.33 — 32.33 182,250 1.24 32.33 176,625 32.33 32.53 — 37.76 60,500 1.89 33.36 48,000 33.31 39.97 — 39.97 137,905 3.31 39.97 62,471 39.97 48.12 — 64.42 83,000 3.89 49.54 81,500 49.26 66.21 — 66.21 4,000 3.86 66.21 2,000 66.21 66.39 — 66.39 154,949 4.19 66.39 39,202 66.39 Total shares/average price 1,060,858 2.35 35.85 767,052 31.92
Summary of RSU activity	The following table sets forth a summary of RSU activity for the year ended December 31, 2015 : Awards Weighted- Average Grant Date Price Balances, beginning of year 592,364 $ 50.24 RSUs granted 565,548 41.30 RSUs vested (236,284 ) 46.30 RSUs forfeited (71,400 ) 48.61 RSUs outstanding 850,228 45.53

Lease Commitments (Tables)

Lease Commitments (Tables)	12 Months Ended
	Dec. 31, 2015
Leases [Abstract]
Schedule Of Future Minimum Lease Payments	Minimum future lease payments under the Company’s operating leases as of December 31, 2015 are summarized as follows (in thousands): 2016 $ 14,312 2017 12,586 2018 9,972 2019 9,429 2020 8,988 Thereafter 37,070 Total minimum lease payments $ 92,357

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Schedule Of United States And Foreign Components Of Income Tax Expense (Benefit)	The following table sets forth information regarding the United States and foreign components of income tax expense for 2015 , 2014 and 2013 (in thousands): Years Ended December 31, Current Deferred Total 2015 United States federal $ (291 ) $ 319 $ 28 State and local 517 35 552 Foreign jurisdiction 1,440 (646 ) 794 Total $ 1,666 $ (292 ) $ 1,374 2014 United States federal $ (3,920 ) $ 28,333 $ 24,413 State and local (594 ) (787 ) (1,381 ) Foreign jurisdiction 1,254 (414 ) 840 Total $ (3,260 ) $ 27,132 $ 23,872 2013 United States federal 3,735 (7,380 ) (3,645 ) State and local 587 (580 ) 7 Foreign jurisdiction 7,433 (222 ) 7,211 Total $ 11,755 $ (8,182 ) $ 3,573
Schedule Of Deferred Tax Assets And Liabilities	The tax effects of temporary differences that gave rise to significant portions of the deferred tax assets at December 31, 2015 , 2014 and 2013 are presented below (in thousands): Years Ended December 31, 2015 2014 2013 Deferred tax assets: Allowance for doubtful accounts $ 478 $ 382 $ 293 Accrued expenses 3,154 4,244 4,144 Deferred revenues 9,300 14,125 13,442 Stock-based compensation expense 9,526 7,849 6,037 Depreciation and amortization expense 723 1,014 423 Tax net operating loss carryforwards 11,861 906 109 Foreign tax credit carryforwards 4,352 2,668 1,403 Research tax carryforwards 7,309 7,425 3,930 Valuation allowance (42,755 ) (33,555 ) (135 ) Total deferred tax assets 3,948 5,058 29,646 Deferred tax liabilities: Depreciation and amortization expense (98 ) (948 ) (1,287 ) Intangibles (5,844 ) (6,404 ) (6,957 ) Investments (149 ) (143 ) (143 ) Total deferred tax liabilities (6,091 ) (7,495 ) (8,387 ) Net deferred tax (liabilities) assets $ (2,143 ) $ (2,437 ) $ 21,259
Schedule of Effective Income Tax Rate Reconciliation	The following table sets forth the items accounting for the difference between expected income tax expense compared to actual income tax expense recorded in the Company’s consolidated financial statements (in thousands): Years Ended December 31, 2015 2014 2013 Expected income tax expense at 35% tax rate $ (7,158 ) $ (6,123 ) $ 4,580 Permanent items (184 ) 485 612 State taxes, net of federal benefit 409 (634 ) 361 Disqualifying dispositions of stock options — (44 ) (353 ) Research tax credit (1,834 ) (2,487 ) (2,441 ) Prior year tax credit adjustment — — 702 Increase (decrease) in liabilities for uncertain tax positions 68 210 (35 ) Valuation allowance 9,201 33,420 135 Other 872 (955 ) 12 Income tax expense $ 1,374 $ 23,872 $ 3,573
Reconciliation Of Beginning And Ending Amount Of Gross Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of the gross unrecognized tax benefits is as follows (in thousands): Years Ended December 31, 2015 2014 Unrecognized Tax Benefits at Beginning of Year $ 2,297 $ 2,087 Increase in balance due to current year tax position 551 439 Decrease in balance due to resolution of prior year tax position (483 ) (229 ) Unrecognized Tax Benefits at End of Year $ 2,365 $ 2,297

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2015
Business Combinations [Abstract]
Fair Value Of The Intangible And Other Assets Acquired And Liabilities Assumed	The following table summarizes the fair value of the intangible and other assets acquired and liabilities assumed at the date of the acquisition (in thousands): May 1, 2014 Cash and cash equivalents $ 61 Prepaid expenses 54 Property and equipment, net 144 Intangible assets, net 5,766 Goodwill 8,202 Total assets acquired 14,227 Accrued accounts payable (5 ) Other current liabilities (44 ) Other long-term liabilities (128 ) Net assets acquired $ 14,050
Intangible Assets Acquired And Economic Useful Life	The following sets forth the current net book value of technology acquired and its original economic useful life (dollars in thousands): As of December 31, 2015 Gross Amount Accumulated Amortization Net Amount Economic Useful Life (in years) Technology $ 5,766 $ 961 $ 4,805 10
Roll Forward Of Goodwill	The following table presents a roll forward of goodwill as of December 31, 2015 (in thousands): Balance as of December 31, 2014 $ 43,732 Foreign currency adjustment (2,243 ) Other 359 Balance as of December 31, 2015 $ 41,848

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule Of Derivative Notional Amount And Fair Value	The following table summarizes the notional amount and fair value of the Company’s outstanding currency contracts at December 31, 2015 and December 31, 2014 , respectively. USD Equivalent Notional Amount (000's) December 31, December 31, Euro $ 3,275 $ 3,041 Japanese Yen 1,495 — US Dollar 150 600 South African Rand 347 — Swedish Krona — 249 Australian Dollar — 738 Total $ 5,267 $ 4,628 Fair Value USD (1) (000's) December 31, December 31, Derivative asset $ 32 $ 17 ___________ (1) The fair value measurement of these derivative contracts falls within Level 2 of the fair value hierarchy as defined in FASB ASC 820. See Note 3 - Investments for further information.

Convertible Notes (Tables)

Convertible Notes (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Schedule of Debt Conversions	If converted, holders of the Notes will receive, at the Company's election, cash, shares of the Company's common stock, or a combination of cash and shares. The initial conversion terms are as follows: Initial Conversion Rate per $1,000 Principal Amount Initial Conversion Price per Share 1.25% Convertible Senior Notes 16.3303 $ 61.24
Convertible Debt	Par Value Outstanding Equity Component Recorded at Issuance Liability Component of Par Value as of (In thousands) December 31, 2015 December 31, 2014 1.25% Convertible Senior Notes $ 150,000 $ 31,756 (1) $ 118,022 $ — ___________ (1) This amount represents the equity component recorded at the initial issuance of the Notes.
Schedule of Long-term Debt Instruments	The Notes consisted of the following (in thousands): As of December 31, 2015 December 31, 2014 Liability component: 1.25% Convertible Senior Notes (1) $ 150,000 $ — Less: convertible notes discount, net (2) (28,554 ) — Less: convertible notes issuance costs (2) (3,424 ) — Net carrying amount $ 118,022 $ — ___________ (1) The effective interest rate of the Notes is 6.25% . The interest rate is based on the interest rates of similar liabilities at the time of issuance that did not have an associated convertible feature. (2) Included in the consolidated balance sheet as of December 31, 2015 within convertible notes and is amortized over the term of the Notes using the effective interest rate method.

Unaudited Selected Quarterly 37

Unaudited Selected Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	The results of operations for any quarter are not necessarily indicative of the results to be expected for any future period (in thousands, except per share amounts): 2015 Quarter Ended Mar. 31, June 30, Sep. 30, Dec. 31, Total revenues $ 89,475 $ 96,331 $ 97,369 $ 107,687 Gross profit 52,951 59,012 58,648 66,631 Operating loss (4,771 ) (3,761 ) (6,182 ) (698 ) Net loss (3,459 ) (5,084 ) (9,752 ) (3,532 ) Net loss per share: Basic (0.16 ) (0.24 ) (0.45 ) (0.16 ) Diluted (0.16 ) (0.24 ) (0.45 ) (0.16 ) Shares used to compute net loss per share: Basic 21,447 21,504 21,664 21,732 Diluted 21,447 21,504 21,664 21,732 2014 Quarter Ended Mar. 31, June 30, Sep. 30, Dec. 31, Total revenues $ 79,448 $ 79,830 $ 89,462 $ 92,556 Gross profit 48,040 46,520 53,987 56,687 Operating (loss) income (4,813 ) (11,513 ) (3,464 ) 2,011 Net loss (1) (2,564 ) (6,798 ) (2,143 ) (29,862 ) Net loss per share: Basic (0.12 ) (0.33 ) (0.10 ) (1.42 ) Diluted (0.12 ) (0.33 ) (0.10 ) (1.42 ) Shares used to compute net loss per share: Basic 20,689 20,851 20,904 21,015 Diluted 20,689 20,851 20,904 21,015

The Company (Details)

The Company (Details)	12 Months Ended
	Dec. 31, 2015country
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of countries with wholly-owned subsidiaries	14
Countries with regional offices	20

Summary Of Significant Accoun39

Summary Of Significant Accounting Policies (Narrative) (Details) shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2014USD ($)	Dec. 31, 2015USD ($)revenue_typeshares	Dec. 31, 2014USD ($)shares	Dec. 31, 2013USD ($)shares
Significant Accounting Policies [Line Items]
Number of revenue types | revenue_type		3
Maturity period of liquid investments to be cash equivalents (in months)		3 months
Advertising expense		$ 4,800	$ 6,200	$ 6,400
Internal use software expenses		12,700	16,900
Research and development expense		73,198	59,482	50,397
Total stock-based compensation expense		16,163	13,259	9,247
Valuation allowance	$ 33,400	9,201	$ 33,420	$ 135
Tax credit carryforwards recorded as deferred tax assets		13,600
Tax credit carryforwards recorded as valuation allowance		$ 42,800
Stock options excluded from diluted net income (loss) per share | shares		393	207	197
Capitalized costs with development and implementation of business systems		$ 4,000	$ 5,200
Minimum
Significant Accounting Policies [Line Items]
Support period (in months)		12 months
Maximum
Significant Accounting Policies [Line Items]
Support period (in months)		18 months
Duration before support begins after contract date (in months)		6 months
Support period if contract includes prepaid support (in months)		36 months
Trademarks And Patents | Minimum
Significant Accounting Policies [Line Items]
Amortization period of intangible assets (in years)		10 years
Trademarks And Patents | Maximum
Significant Accounting Policies [Line Items]
Amortization period of intangible assets (in years)		15 years
Customer Relationships, Core Technology And Non-Compete Agreements | Minimum
Significant Accounting Policies [Line Items]
Amortization period of intangible assets (in years)		5 years
Customer Relationships, Core Technology And Non-Compete Agreements | Maximum
Significant Accounting Policies [Line Items]
Amortization period of intangible assets (in years)		18 years
Software Service, Support and Maintenance Arrangement | Minimum
Significant Accounting Policies [Line Items]
Support period		12 months
Software Service, Support and Maintenance Arrangement | Maximum
Significant Accounting Policies [Line Items]
Support period		3 years
Internal Use Software Related To Pure Cloud [Member]
Significant Accounting Policies [Line Items]
Capitalized costs with development and implementation of business systems		$ 12,700	$ 16,900

Summary Of Significant Accoun40

Summary Of Significant Accounting Policies (Calculation Of Basic And Diluted Net Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Changes and Error Corrections [Abstract]
Net (loss) income	$ (3,532)	$ (9,752)	$ (5,084)	$ (3,459)	$ (29,862)	$ (2,143)	$ (6,798)	$ (2,564)	$ (21,827)	$ (41,367)	$ 9,515
Weighted average shares of common stock outstanding (shares)	21,732	21,664	21,504	21,447	21,015	20,904	20,851	20,689	21,609	20,930	20,033
Dilutive effect of employee stock options and RSUs (shares)									0	0	1,055
Common stock and common stock equivalents (shares)	21,732	21,664	21,504	21,447	21,015	20,904	20,851	20,689	21,609	20,930	21,088
Basic (in dollars per share)	$ (0.16)	$ (0.45)	$ (0.24)	$ (0.16)	$ (1.42)	$ (0.10)	$ (0.33)	$ (0.12)	$ (1.01)	$ (1.98)	$ 0.47
Diluted (in dollars per share)	$ (0.16)	$ (0.45)	$ (0.24)	$ (0.16)	$ (1.42)	$ (0.10)	$ (0.33)	$ (0.12)	$ (1.01)	$ (1.98)	$ 0.45

Investments (Narrative) (Detail

Investments (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Investments [Line Items]
Short-term investments	$ 64,182	$ 20,041
Long-term investments	30,503	5,495
Maximum gross realized gains and losses included in interest income, net	$ 15	$ 15	$ 15
Long-term investments: | Minimum
Schedule of Investments [Line Items]
Maturity Period (in years)	1 year
Long-term investments: | Maximum
Schedule of Investments [Line Items]
Maturity Period (in years)	3 years

Investments (Financial Assets M

Investments (Financial Assets Measured At Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash & cash equivalents, Total	$ 94,808	$ 36,168
Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	64,182	20,041
Long-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	30,503	5,495
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash & cash equivalents, Total	94,808	36,168
Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	0	1,000
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash & cash equivalents, Total	0	0
Significant Other Observable Inputs (Level 2) | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	64,182	20,041
Significant Other Observable Inputs (Level 2) | Long-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	30,503	4,495
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash & cash equivalents, Total	0	0
Significant Unobservable Inputs (Level 3) | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	0	0
Significant Unobservable Inputs (Level 3) | Long-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	0	0
Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash & cash equivalents, Total	91,974	34,452
Cash | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash & cash equivalents, Total	91,974	34,452
Cash | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash & cash equivalents, Total	0	0
Cash | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash & cash equivalents, Total	0	0
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash & cash equivalents, Total	2,834	1,716
Money market funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash & cash equivalents, Total	2,834	1,716
Money market funds | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash & cash equivalents, Total	0	0
Money market funds | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash & cash equivalents, Total	0	0
Corporate notes | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	27,105	19,241
Corporate notes | Long-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	29,504	4,495
Corporate notes | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	0	0
Corporate notes | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	0	0
Corporate notes | Significant Other Observable Inputs (Level 2) | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	27,105	19,241
Corporate notes | Significant Other Observable Inputs (Level 2) | Long-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	29,504	4,495
Corporate notes | Significant Unobservable Inputs (Level 3) | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	0	0
Corporate notes | Significant Unobservable Inputs (Level 3) | Long-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	0	0
Agency bonds | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	27,002
Agency bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	0
Agency bonds | Significant Other Observable Inputs (Level 2) | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	27,002
Agency bonds | Significant Unobservable Inputs (Level 3) | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	0
Asset-backed securities | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	4,681
Asset-backed securities | Long-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	999
Asset-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	0
Asset-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	0
Asset-backed securities | Significant Other Observable Inputs (Level 2) | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	4,681
Asset-backed securities | Significant Other Observable Inputs (Level 2) | Long-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	999
Asset-backed securities | Significant Unobservable Inputs (Level 3) | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	0
Asset-backed securities | Significant Unobservable Inputs (Level 3) | Long-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	0
Commercial paper | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	1,498	800
Commercial paper | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	0	0
Commercial paper | Significant Other Observable Inputs (Level 2) | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	1,498	800
Commercial paper | Significant Unobservable Inputs (Level 3) | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	0	0
U.S. government securities | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	3,896
U.S. government securities | Long-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total		1,000
U.S. government securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	0
U.S. government securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total		1,000
U.S. government securities | Significant Other Observable Inputs (Level 2) | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	3,896
U.S. government securities | Significant Other Observable Inputs (Level 2) | Long-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total		0
U.S. government securities | Significant Unobservable Inputs (Level 3) | Short-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total	$ 0
U.S. government securities | Significant Unobservable Inputs (Level 3) | Long-term investments:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Total		$ 0

Accounts Receivable And Conce43

Accounts Receivable And Concentration Of Credit Risk (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)partner	Dec. 31, 2014USD ($)partner	Dec. 31, 2013
Concentration Risk [Line Items]
Unbilled accounts receivable | $	$ 9.6	$ 8
Number of partners holding significant accounts receivable | partner	5	5
Revenue
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%	10.00%	10.00%
Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%	10.00%
Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	14.00%	17.00%

Property And Equipment (Narrati

Property And Equipment (Narrative) (Details)	12 Months Ended
	Dec. 31, 2015
Minimum
Property, Plant and Equipment [Line Items]
Property and equipment useful life	3 years
Minimum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment useful life	3 years
Maximum
Property, Plant and Equipment [Line Items]
Property and equipment useful life	7 years
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment useful life	15 years

Property And Equipment (Summary

Property And Equipment (Summary Of Property And Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 108,144	$ 95,237
Less accumulated depreciation	(63,307)	(50,452)
Net property and equipment	44,837	44,785
Computer equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	25,050	25,905
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	22,898	21,103
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	12,982	12,719
Data center equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	35,934	27,800
Software
Property, Plant and Equipment [Line Items]
Total property and equipment	3,261	2,956
Office equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	1,467	2,198
Trade show equipment and other
Property, Plant and Equipment [Line Items]
Total property and equipment	924	929
Construction in process
Property, Plant and Equipment [Line Items]
Total property and equipment	4,256	1,627
Capital lease assets
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 1,372	$ 0

Capitalized Software (Narrative

Capitalized Software (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Internal use software expenses	$ 12,700	$ 16,900
Capitalized internal-use software development costs related to PureCloud Platform, net of accumulated amortization of $3,928 and $0, respectively
Software amortization expense	3,900
Capitalized internal-use software development costs related to internal business systems, net of accumulated amortization of $5,443 and $3,258, respectively
Software amortization expense	2,200	1,100	$ 1,100
Capitalized computer software costs	4,000	5,200
Acquired developed technology, net of accumulated amortization of $1,557 and $1,161, respectively
Software amortization expense	396	540	$ 196
Capitalized computer software costs	$ 350,000	$ 5,800

Capitalized Software (Schedule

Capitalized Software (Schedule of Capitalized Software) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Capitalized software, net	$ 43,783	$ 33,598
Capitalized internal-use software development costs related to PureCloud Platform, net of accumulated amortization of $3,928 and $0, respectively
Property, Plant and Equipment [Line Items]
Capitalized software, net	29,275	20,448
Amortization expense	3,928	0
Capitalized internal-use software development costs related to internal business systems, net of accumulated amortization of $5,443 and $3,258, respectively
Property, Plant and Equipment [Line Items]
Capitalized software, net	8,060	6,337
Amortization expense	5,443	3,258
Acquired developed technology, net of accumulated amortization of $1,557 and $1,161, respectively
Property, Plant and Equipment [Line Items]
Capitalized software, net	6,448	6,813
Amortization expense	$ 1,557	$ 1,161

Stock-Based Compensation (Narra

Stock-Based Compensation (Narrative) (Details)	May. 22, 2013shares	May. 31, 2000USD ($)shares	Dec. 31, 2015USD ($)itemstock_option_type$ / sharesshares	Dec. 31, 2014USD ($)$ / sharesshares	Dec. 31, 2013USD ($)$ / sharesshares	May. 31, 2005shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of types of stock options | stock_option_type			3
Capitalized share based compensation Costs | $			$ 1,400,000	$ 1,700,000	$ 0
Granted (in shares) | shares			0
Term of option (in years)			5 years
Incentive stock option stock ownership threshold, more than			10.00%
Exercise price of option over market value minimum percent, less than			110.00%
Total intrinsic value of options exercised | $			$ 4,900,000
Aggregate intrinsic value of options outstanding | $			3,800,000
Aggregate intrinsic value of options currently exercisable | $			$ 3,300,000
Company's closing stock price per share (in dollars per share) | $ / shares			$ 31.42
Total unrecognized compensation cost related to non-vested stock options | $			$ 4,300,000
Weighted average remaining vesting period (in years)			1 year 3 months
2006 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares available for issuance | shares	2,000,000
Shares available for delivery | shares	9,050,933
Shares of stock available for issuance for equity compensation awards | shares			1,215,271	1,897,742	2,338,146
Weighted average exercise price (in dollars per share) | $ / shares				$ 31.38	$ 17.99
Plans Since 2005
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of option (in years)			6 years
2000 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of stock available for issuance for equity compensation awards | shares			20,728
Common stock shares reserved for future issuance | shares		500,000				750,000
Periodic payroll deduction percent of compensation maximum		20.00%
Compensation deduction maximum cap per pay period | $		$ 1,000
Purchase price of common stock, percent		95.00%
Plan maximum annual contributions per employee amount | $		$ 25,000
Shares purchased and issued | shares			42,635	25,365	19,002
Purchase plan, average price | $ / shares			$ 37.42	$ 52.04	$ 44.02
Non-Performance-Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equal vesting installments | item			4
Period after grant date			1 year
Performance-Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equal vesting installments | item			4
Period after grant date			1 year
Director stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period after grant date			1 year
Recognition period			1 year
Non Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equal vesting installments | item			4
Period after grant date			1 year
In the Money Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average exercise price (in dollars per share) | $ / shares			$ 22.19
Total number of in-the-money options exercisable (in shares) | shares			357,254
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares			565,548
Weighted average remaining vesting period (in years)			2 years 5 months 5 days
Total unrecognized compensation cost related to non-vested RSUs | $			$ 30,600,000
Scenario, Adjustment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense | $			$ (194,000)	$ (300,000)	$ (128,000)

Stock-Based Compensation (Alloc

Stock-Based Compensation (Allocation of Stock-Based Compensation Expense) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 16,163	$ 13,259	$ 9,247
Effects of Stock-based compensation: Basic (in dollars per share)	$ (0.75)	$ (0.63)	$ (0.46)
Effects of Stock-based compensation: Diluted (in dollars per share)	$ (0.75)	$ (0.63)	$ (0.44)
Costs of recurring revenues
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 1,828	$ 1,345	$ 806
Costs of services revenues
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	717	432	245
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	3,959	4,077	3,109
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	5,273	4,027	2,733
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 4,386	$ 3,378	$ 2,354

Stock-Based Compensation (Sched

Stock-Based Compensation (Schedule Of Grant Date Fair Value) (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of Options Granted (in shares)	0	271	275
Number of Options Cancelled (in shares)	0	101	46
Grant Date Fair Value	$ 0	$ 7,068	$ 4,521

Stock-Based Compensation (Sch51

Stock-Based Compensation (Schedule of Valuation Assumptions) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Non-Performance-Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%	0.00%
Expected volatility, minimum		54.36%
Expected volatility, maximum		54.44%
Expected volatility	60.41%
Risk-free interest rate, minimum		1.04%
Risk-free interest rate, maximum		1.12%
Risk-free interest rate	1.38%
Expected life of option (in years)	4 years	4 years 3 months
Performance-Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%	0.00%
Expected volatility	59.76%	57.56%
Risk-free interest rate	1.51%	0.73%
Expected life of option (in years)	4 years 6 months	4 years 9 months
Director stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%	0.00%
Expected volatility	61.70%	49.33%
Risk-free interest rate	1.17%	0.54%
Expected life of option (in years)	4 years	3 years 6 months

Stock-Based Compensation (Summa

Stock-Based Compensation (Summary of Stock Option Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Granted (in shares)	0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Balances, beginning of year (in shares)	1,350,799	1,852,620	2,631,198
Weighted-Average Exercise Price, Balance, beginning of year (in dollars per share)	$ 32.95	$ 22.25	$ 17.21
Granted (in shares)	0	225,250	251,250
Weighted-Average Exercise Price, Granted (in dollars per share)	$ 0	$ 63.15	$ 41.91
Exercised (in shares)	(251,464)	(672,321)	(1,007,578)
Weighted-Average Exercise Price, Exercised (in dollars per share)	$ 18.74	$ 12.79	$ 14
Cancelled, forfeited or expired (in shares)	(38,477)	(54,750)	(22,250)
Weighted-Average Exercise Price, Cancelled, forfeited or expired (in dollars per share)	$ 45.88	$ 42.73	$ 20.98
Options outstanding at end of year (in shares)	1,060,858	1,350,799	1,852,620
Weighted-Average Exercise Price, Options Outstanding at end of year (in dollars per share)	$ 35.85	$ 32.95	$ 22.25
Range of exercise price, lower limit (in dollars per share)	6.66	6.66	3.53
Range of exercise price, upper limit (in dollars per share)	66.39	66.39	66.21
Weighted-average fair value of options granted (in dollars per share)	$ 0	$ 31.38	$ 17.99
Options exercisable at end of year (in shares)	767,052	723,801	1,010,495
Weighted-Average Exercise Price, Options exercisable at end of year (in dollars per share)	$ 31.92	$ 24.98	$ 15.53

Stock-Based Compensation (Sum53

Stock-Based Compensation (Summary of Stock Options Outstanding and Exercisable) (Details)	12 Months Ended
	Dec. 31, 2015$ / sharesshares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, number (in shares) | shares	1,060,858
Options outstanding, weighted-average remaining contractual life (in years)	2 years 4 months 6 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 35.85
Options exercisable, number (in shares) | shares	767,052
Options exercisable, weighted-average exercise price (in dollars per share)	$ 31.92
Range 1
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, lower limit (in dollars per share)	6.66
Range of exercise price, upper limit (in dollars per share)	$ 19.66
Options outstanding, number (in shares) | shares	147,725
Options outstanding, weighted-average remaining contractual life (in years)	4 months 28 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 18.11
Options exercisable, number (in shares) | shares	147,725
Options exercisable, weighted-average exercise price (in dollars per share)	$ 18.11
Range 2
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, lower limit (in dollars per share)	19.77
Range of exercise price, upper limit (in dollars per share)	$ 22.92
Options outstanding, number (in shares) | shares	3,400
Options outstanding, weighted-average remaining contractual life (in years)	1 year 4 months 21 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 21.76
Options exercisable, number (in shares) | shares	2,150
Options exercisable, weighted-average exercise price (in dollars per share)	$ 21.09
Range 3
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, lower limit (in dollars per share)	24.50
Range of exercise price, upper limit (in dollars per share)	$ 24.50
Options outstanding, number (in shares) | shares	224,379
Options outstanding, weighted-average remaining contractual life (in years)	2 years 2 months 19 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 24.50
Options exercisable, number (in shares) | shares	154,379
Options exercisable, weighted-average exercise price (in dollars per share)	$ 24.50
Range 4
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, lower limit (in dollars per share)	25
Range of exercise price, upper limit (in dollars per share)	$ 30.92
Options outstanding, number (in shares) | shares	62,750
Options outstanding, weighted-average remaining contractual life (in years)	2 years 3 months 18 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 27.07
Options exercisable, number (in shares) | shares	53,000
Options exercisable, weighted-average exercise price (in dollars per share)	$ 26.87
Range 5
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, lower limit (in dollars per share)	32.33
Range of exercise price, upper limit (in dollars per share)	$ 32.33
Options outstanding, number (in shares) | shares	182,250
Options outstanding, weighted-average remaining contractual life (in years)	1 year 2 months 27 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 32.33
Options exercisable, number (in shares) | shares	176,625
Options exercisable, weighted-average exercise price (in dollars per share)	$ 32.33
Range 6
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, lower limit (in dollars per share)	32.53
Range of exercise price, upper limit (in dollars per share)	$ 37.76
Options outstanding, number (in shares) | shares	60,500
Options outstanding, weighted-average remaining contractual life (in years)	1 year 10 months 21 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 33.36
Options exercisable, number (in shares) | shares	48,000
Options exercisable, weighted-average exercise price (in dollars per share)	$ 33.31
Range 7
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, lower limit (in dollars per share)	39.97
Range of exercise price, upper limit (in dollars per share)	$ 39.97
Options outstanding, number (in shares) | shares	137,905
Options outstanding, weighted-average remaining contractual life (in years)	3 years 3 months 22 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 39.97
Options exercisable, number (in shares) | shares	62,471
Options exercisable, weighted-average exercise price (in dollars per share)	$ 39.97
Range 8
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, lower limit (in dollars per share)	48.12
Range of exercise price, upper limit (in dollars per share)	$ 64.42
Options outstanding, number (in shares) | shares	83,000
Options outstanding, weighted-average remaining contractual life (in years)	3 years 10 months 21 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 49.54
Options exercisable, number (in shares) | shares	81,500
Options exercisable, weighted-average exercise price (in dollars per share)	$ 49.26
Range 9
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, lower limit (in dollars per share)	66.21
Range of exercise price, upper limit (in dollars per share)	$ 66.21
Options outstanding, number (in shares) | shares	4,000
Options outstanding, weighted-average remaining contractual life (in years)	3 years 10 months 10 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 66.21
Options exercisable, number (in shares) | shares	2,000
Options exercisable, weighted-average exercise price (in dollars per share)	$ 66.21
Range 10
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, lower limit (in dollars per share)	66.39
Range of exercise price, upper limit (in dollars per share)	$ 66.39
Options outstanding, number (in shares) | shares	154,949
Options outstanding, weighted-average remaining contractual life (in years)	4 years 2 months 9 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 66.39
Options exercisable, number (in shares) | shares	39,202
Options exercisable, weighted-average exercise price (in dollars per share)	$ 66.39

Stock-Based Compensation (Sum54

Stock-Based Compensation (Summary of RSU Activity) (Details)	12 Months Ended
	Dec. 31, 2015$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Granted (in shares)	0
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Balances, beginning of year (in shares)	592,364
Weighted-Average Exercise Price, Balance, beginning of year (in dollars per share) | $ / shares	$ 50.24
Granted (in shares)	565,548
Weighted-Average Exercise Price, Granted (in dollars per share) | $ / shares	$ 41.30
Vested (in shares)	(236,284)
Weighted-Average Exercise Price, Vested (in dollars per share) | $ / shares	$ 46.30
Forfeited (in shares)	(71,400)
Weighted-Average Exercise Price, Forfeited (in dollars per share) | $ / shares	$ 48.61
Options outstanding at end of year (in shares)	850,228
Weighted-Average Exercise Price, Options Outstanding at end of year (in dollars per share) | $ / shares	$ 45.53

Lease Commitments (Narrative) (

Lease Commitments (Narrative) (Details) ft² in Thousands, $ in Millions	May. 06, 2014buildingamendment	Dec. 31, 2015USD ($)ft²countrybuilding	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Apr. 01, 2001building
Operating Leased Assets [Line Items]
Size of building (sq ft) | ft²		425
Number of office buildings		4
Number of other countries with office leases | country		20
Duration of initial lease terms (in years)		5 years
Rent expense, net | $		$ 13.7	$ 12.5	$ 9.9
Duke Realty Limited Partnership
Operating Leased Assets [Line Items]
Number of office buildings	3
Duke Realty Limited Partnership | Office Lease
Operating Leased Assets [Line Items]
Number of office buildings leased					3
Number of amendments | amendment	8
Duke Realty Limited Partnership | Expires March, 2018
Operating Leased Assets [Line Items]
Number of office buildings	1
Duke Realty Limited Partnership | Expires On or After June, 2025
Operating Leased Assets [Line Items]
Number of office buildings	2
Minimum
Operating Leased Assets [Line Items]
Lease term (in years)		3 years
Maximum
Operating Leased Assets [Line Items]
Lease term (in years)		5 years

Lease Commitments (Schedule Of

Lease Commitments (Schedule Of Future Minimum Lease Payments) (Details) $ in Thousands	Dec. 31, 2015USD ($)
Leases [Abstract]
2,016	$ 14,312
2,017	12,586
2,018	9,972
2,019	9,429
2,020	8,988
Thereafter	37,070
Total minimum lease payments	$ 92,357

Retirement Savings Plan (Detail

Retirement Savings Plan (Details) - USD ($)	1 Months Ended	12 Months Ended
	Feb. 29, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Maximum contribution percentage of pre-tax annual compensation per employee			50.00%
Employer maximum matching contribution percent			33.00%	33.00%	33.00%
Employee contribution percent			9.00%	9.00%	9.00%
Employer maximum matched contribution to employee accounts				$ 2,700,000	$ 2,000,000
Vesting period if employed for less than 4 years			4 years
Number of years employed before being fully vested			4 years
Percent vested after employed for 4 years			100.00%
Subsequent Event
Employer maximum matched contribution to employee accounts	$ 3,000,000
Forecast
Employer maximum matching contribution percent		33.00%
Employee contribution percent		9.00%

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Deferred tax expense related to change in valuation allowance	$ 33,400,000	$ 9,201,000	$ 33,420,000	$ 135,000
Change in valuation allowance		9,200,000
Valuation allowance	33,555,000	42,755,000	33,555,000	135,000
Tax benefits related to the exercise of stock options		0	0	13,479,000
Foreign tax credits and federal and state research tax credit carryforwards		13,600,000
Foreign tax expense (benefit)	500,000	$ 800,000	$ 500,000	$ 6,800,000
Effective income tax rate		48.54%	2.08%	190.00%
Reserve for uncertain tax position	$ 2,300,000	$ 2,400,000	$ 2,300,000
Interest expense and penalties related to unrecognized tax benefits		$ 0	$ 27,000,000

Income Taxes (Schedule Of Unite

Income Taxes (Schedule Of United States And Foreign Components Of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current, United States Federal	$ (291)	$ (3,920)	$ 3,735
Current, State and local	517	(594)	587
Current, Foreign jurisdiction	1,440	1,254	7,433
Current, Total	1,666	(3,260)	11,755
Deferred, United States Federal	319	28,333	(7,380)
Deferred, State and local	35	(787)	(580)
Deferred, Foreign jurisdiction	(646)	(414)	(222)
Deferred, total	(292)	27,132	(8,182)
Total, United States Federal	28	24,413	(3,645)
Total, State and local	552	(1,381)	7
Total, Foreign jurisdiction	794	840	7,211
Income tax expense	$ 1,374	$ 23,872	$ 3,573

Income Taxes (Schedule Of Defer

Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Allowance for doubtful accounts	$ 478	$ 382	$ 293
Accrued expenses	3,154	4,244	4,144
Deferred revenues	9,300	14,125	13,442
Stock-based compensation expense	9,526	7,849	6,037
Depreciation and amortization expense	723	1,014	423
Tax net operating loss carryforwards	11,861	906	109
Foreign tax credit carryforwards	4,352	2,668	1,403
Research tax carryforwards	7,309	7,425	3,930
Valuation allowance	(42,755)	(33,555)	(135)
Total deferred tax assets	3,948	5,058	29,646
Depreciation and amortization expense	(98)	(948)	(1,287)
Intangibles	(5,844)	(6,404)	(6,957)
Investments	(149)	(143)	(143)
Total deferred tax liabilities	(6,091)	(7,495)	(8,387)
Net deferred tax (liabilities) assets	$ (2,143)	$ (2,437)
Net deferred tax (liabilities) assets			$ 21,259

Income Taxes (Schedule Of Effec

Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Expected income tax expense at 35% tax rate		$ (7,158)	$ (6,123)	$ 4,580
Permanent items		(184)	485	612
State taxes, net of federal benefit		409	(634)	361
Disqualifying dispositions of stock options		0	(44)	(353)
Research tax credit		(1,834)	(2,487)	(2,441)
Prior year tax credit adjustment		0	0	702
Increase (decrease) in liabilities for uncertain tax positions		68	210	(35)
Valuation allowance	$ 33,400	9,201	33,420	135
Other		872	(955)	12
Income tax expense		$ 1,374	$ 23,872	$ 3,573
Federal statutory tax rate		35.00%	35.00%	35.00%

Income Taxes (Reconciliation Of

Income Taxes (Reconciliation Of Beginning And Ending Amount Of Gross Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits at Beginning of Year	$ 2,297	$ 2,087
Increase in balance due to current year tax position	551	439
Decrease in balance due to resolution of prior year tax position	(483)	(229)
Unrecognized Tax Benefits at End of Year	$ 2,365	$ 2,297

Segment And Geographic Disclo63

Segment And Geographic Disclosures (Details) - segment	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of operating segments	1
U.S. customers and partners percentage of total revenue	64.00%	64.00%	63.00%
Foreign customers and partners percentage of total revenue	10.00%	10.00%	10.00%
Property and equipment, net located in foreign countries	22.00%	24.00%
Maximum
Net property and equipment, net located in foreign countries	10.00%	10.00%

Commitments And Contingencies (

Commitments And Contingencies (Narrative) (Details) - USD ($)	Mar. 06, 2015	Dec. 31, 2015
Operating Leased Assets [Line Items]
Initial term (in years)	5 years
Potential obligation up to amount	$ 5,000,000
Software
Operating Leased Assets [Line Items]
Warranty period (in years)		1 year

Acquisitions (Narrative) (Detai

Acquisitions (Narrative) (Details) - OrgSpan, Inc. $ in Thousands	May. 14, 2014USD ($)employeeshares	Jul. 31, 2015shares
Business Acquisition [Line Items]
Consideration transferred	$ 14,100
Debt principal amount	$ 8,000
Interest rate	4.25%
Cash paid for acquisition	$ 1,400
Shares exchanged for acquisition | shares	98,999
Shares exchanged for acquisition, value	$ 4,700
Preliminary purchase price	$ 15,600
Assembled workforce, number of employees | employee	38
Professional fees	$ 613
Restricted Stock
Business Acquisition [Line Items]
Number of shares issued | shares		32,999

Acquisitions (Fair Value Of The

Acquisitions (Fair Value Of The Intangible And Other Assets Acquired And Liabilities Assumed) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	May. 01, 2014
Business Acquisition [Line Items]
Goodwill	$ 41,848	$ 43,732
OrgSpan, Inc.
Business Acquisition [Line Items]
Cash and cash equivalents			$ 61
Prepaid expenses			54
Property and equipment, net			144
Intangible assets, net			5,766
Goodwill			8,202
Total assets acquired			14,227
Accrued accounts payable			(5)
Other current liabilities			(44)
Other long-term liabilities			(128)
Net assets acquired			$ 14,050

Acquisitions (Intangible Assets

Acquisitions (Intangible Assets Acquired And Economic Useful Life) (Details) - OrgSpan, Inc. - Technology $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 5,766
Accumulated Amortization	961
Net Amount	$ 4,805
Economic Useful Life (in years)	10 years

Acquisitions (Roll Forward Of G

Acquisitions (Roll Forward Of Goodwill) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Goodwill [Roll Forward]
December 31, 2014	$ 43,732
Foreign currency adjustment	(2,243)
Other	359
December 31, 2015	$ 41,848

Derivatives (Narrative) (Detail

Derivatives (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Hedging gains (losses)	$ 498	$ 102

Derivatives (Schedule Of Deriva

Derivatives (Schedule Of Derivative Notional Amount And Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Notional Amount	$ 5,267	$ 4,628
Derivative asset	32	17
Euro
Derivatives, Fair Value [Line Items]
Notional Amount	3,275	3,041
Japanese Yen
Derivatives, Fair Value [Line Items]
Notional Amount	1,495
US Dollar
Derivatives, Fair Value [Line Items]
Notional Amount	150	600
South African Rand
Derivatives, Fair Value [Line Items]
Notional Amount	$ 347
Swedish Krona
Derivatives, Fair Value [Line Items]
Notional Amount		249
Australian Dollar
Derivatives, Fair Value [Line Items]
Notional Amount		$ 738

Convertible Notes Narrative (De

Convertible Notes Narrative (Details)	1 Months Ended	12 Months Ended
	May. 31, 2015USD ($)trading_daystrading_day$ / shares$ / unit	Dec. 31, 2015USD ($)$ / shares	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Debt Instrument [Line Items]
Net proceeds used		$ 12,750,000	$ 0	$ 0
Company's closing stock price per share (in dollars per share) | $ / shares		$ 31.42
Convertible Debt | Convertible 1.25% Senior Notes
Debt Instrument [Line Items]
Debt principal amount	$ 150,000,000
Interest rate percent		6.25%
Percent of principal	100.00%
Fell below principal amount		$ 73,000,000
Convertible Debt | Convertible 1.25% Senior Notes | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Minimum trading days | trading_day	20
Consecutive trading days	30 days
Percent of conversion price	130.00%
Convertible Debt | Convertible 1.25% Senior Notes | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Minimum trading days | trading_days	5
Consecutive trading days	5 days
Percent of conversion price	98.00%
Call Option | Convertible Debt | Convertible 1.25% Senior Notes
Debt Instrument [Line Items]
Net proceeds used	$ 12,800,000
Price per share (in dollars per share) | $ / shares	$ 61.24
Cap price per share (in dollars per share) | $ / unit	79.38
Significant Other Observable Inputs (Level 2) | Convertible Debt | Convertible 1.25% Senior Notes
Debt Instrument [Line Items]
Fair value of notes		$ 124,700,000
Common Stock
Debt Instrument [Line Items]
Company's closing stock price per share (in dollars per share) | $ / shares		$ 31.42

Convertible Notes Schedule of D

Convertible Notes Schedule of Debt Conversions (Details) - Convertible Debt - Convertible 1.25% Senior Notes	1 Months Ended
	May. 31, 2015$ / shares
Debt Instrument [Line Items]
Initial Conversion Rate per $1,000 Principal Amount	16.3303
Initial Conversion Price per Share	$ 61.24

Convertible Notes Convertible D

Convertible Notes Convertible Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Liability Component of Par Value as of	$ 118,022
Convertible Debt | Convertible 1.25% Senior Notes
Debt Instrument [Line Items]
Par Value Outstanding	150,000	$ 0
Equity Component Recorded at Issuance	$ 31,756
Liability Component of Par Value as of		$ 0

Convertible Notes Schedule of L

Convertible Notes Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Less: convertible notes discount, net	$ (28,554)	$ 0
Less: convertible notes issuance costs	(3,424)	0
Convertible notes	118,022	0
Convertible Debt | Convertible 1.25% Senior Notes
Debt Instrument [Line Items]
Par Value Outstanding	$ 150,000	$ 0

Unaudited Selected Quarterly 75

Unaudited Selected Quarterly Financial Data (Schedule Of Selected Quarterly Financial Data) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 107,687	$ 97,369	$ 96,331	$ 89,475	$ 92,556	$ 89,462	$ 79,830	$ 79,448	$ 390,862	$ 341,296	$ 318,234
Gross profit	66,631	58,648	59,012	52,951	56,687	53,987	46,520	48,040	237,242	205,234	205,084
Operating loss	(698)	(6,182)	(3,761)	(4,771)	2,011	(3,464)	(11,513)	(4,813)	(15,412)	(17,779)	14,397
Net income (loss)	$ (3,532)	$ (9,752)	$ (5,084)	$ (3,459)	$ (29,862)	$ (2,143)	$ (6,798)	$ (2,564)	$ (21,827)	$ (41,367)	$ 9,515
Net income (loss) per share:
Basic (in dollars per share)	$ (0.16)	$ (0.45)	$ (0.24)	$ (0.16)	$ (1.42)	$ (0.10)	$ (0.33)	$ (0.12)	$ (1.01)	$ (1.98)	$ 0.47
Diluted (in dollars per share)	$ (0.16)	$ (0.45)	$ (0.24)	$ (0.16)	$ (1.42)	$ (0.10)	$ (0.33)	$ (0.12)	$ (1.01)	$ (1.98)	$ 0.45
Shares used to compute net income (loss) per share:
Basic (shares)	21,732	21,664	21,504	21,447	21,015	20,904	20,851	20,689	21,609	20,930	20,033
Diluted (shares)	21,732	21,664	21,504	21,447	21,015	20,904	20,851	20,689	21,609	20,930	21,088
Valuation allowance					$ 33,400				$ 9,201	$ 33,420	$ 135

Valuation And Qualifying Acco76

Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 1,052	$ 1,233	$ 1,584
Charged to Revenue and Expenses, net	745	322	132
Reduction of Allowance	289	503	483
Balance at End of Period	$ 1,508	$ 1,052	$ 1,233