Ellie Mae (ELLI) 10-Q 1 Nov 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Oct. 28, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	ELLIE MAE INC
Entity Central Index Key	1,122,388
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Amendment Flag	false
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		33,564,862

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 344,539	$ 34,396
Short-term investments	43,688	48,975
Accounts receivable, net of allowance for doubtful accounts of $95 and $124 as of September 30, 2016 and December 31, 2015, respectively	47,835	28,568
Prepaid expenses and other current assets	11,254	9,874
Total current assets	447,316	121,813
Property and equipment, net	112,621	81,360
Long-term investments	44,010	55,473
Intangible assets, net	18,368	22,810
Deposits and other assets	8,967	8,888
Goodwill	74,547	74,547
Total assets	705,829	364,891
Current liabilities:
Accounts payable	7,198	9,911
Accrued and other current liabilities	30,106	37,307
Deferred revenue	19,693	15,864
Total current liabilities	56,997	63,082
Leases payable, net of current portion	117	685
Other long-term liabilities	18,199	10,273
Total liabilities	75,313	74,040
Commitments and contingencies (Note 8)
Stockholders' equity:
Common stock, $0.0001 par value per share; 140,000,000 authorized shares, 33,549,594 and 29,566,511 shares issued and outstanding as of September 30, 2016 and December 31, 2015, respectively	3	3
Additional paid-in capital	597,811	285,342
Accumulated other comprehensive income (loss)	65	(257)
Retained earnings	32,637	5,763
Total stockholders' equity	630,516	290,851
Total liabilities and stockholders' equity	$ 705,829	$ 364,891

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Accounts receivable, allowances for doubtful accounts	$ 95	$ 124
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	140,000,000	140,000,000
Common stock, shares issued	33,549,594	29,566,511
Common stock, shares outstanding	33,549,594	29,566,511

Condensed Consolidated Statemen

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues	$ 100,381	$ 68,939	$ 264,104	$ 189,070
Cost of revenues	32,218	22,441	87,302	60,653
Gross profit	68,163	46,498	176,802	128,417
Operating expenses:
Sales and marketing	12,654	9,082	40,446	27,646
Research and development	15,081	11,138	42,196	28,717
General and administrative	19,360	16,658	52,885	43,109
Total operating expenses	47,095	36,878	135,527	99,472
Income from operations	21,068	9,620	41,275	28,945
Other income, net	204	154	565	439
Income before income taxes	21,272	9,774	41,840	29,384
Income tax provision	7,492	3,552	14,966	11,948
Net income	$ 13,780	$ 6,222	$ 26,874	$ 17,436
Net income per share of common stock:
Basic	$ 0.43	$ 0.21	$ 0.88	$ 0.60
Diluted	$ 0.41	$ 0.20	$ 0.84	$ 0.57
Weighted average common shares used in computing net income per share of common stock:
Basic	31,916,910	29,363,621	30,407,020	29,076,820
Diluted	33,482,533	31,005,651	32,039,083	30,773,353
Other comprehensive income, net of taxes:
Net income	$ 13,780	$ 6,222	$ 26,874	$ 17,436
Unrealized gain (loss) on investments	(107)	27	322	157
Comprehensive income	$ 13,673	$ 6,249	$ 27,196	$ 17,593

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 26,874,000	$ 17,436,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	14,487,000	7,324,000
Provision for uncollectible accounts receivable	77,000	14,000
Amortization of intangible assets	4,442,000	3,689,000
Stock-based compensation expense	23,456,000	17,604,000
Excess tax benefit from stock-based compensation	(5,472,000)	(3,828,000)
Deferred income taxes	9,363,000	9,977,000
Loss on disposal of property and equipment	5,000	91,000
Amortization of investment premium	779,000	778,000
Changes in operating assets and liabilities:
Accounts receivable	(19,344,000)	(8,535,000)
Prepaid expenses and other current assets	(1,381,000)	(394,000)
Deposits and other assets	(2,298,000)	(985,000)
Accounts payable	(349,000)	303,000
Accrued, other current and other liabilities	1,238,000	17,366,000
Deferred revenue	3,759,000	3,696,000
Net cash provided by operating activities	55,636,000	64,536,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property and equipment	(21,074,000)	(20,677,000)
Acquisition of internal-use software	(25,218,000)	(20,706,000)
Proceeds from sale of property and equipment	0	58,000
Purchases of investments	(49,201,000)	(39,243,000)
Maturities of investments	45,494,000	39,790,000
Net cash used in investing activities	(29,999,000)	(40,778,000)
Sale of investments	20,000,000	0
CASH FLOWS FROM FINANCING ACTIVITIES:
Payment of capital lease obligations	(2,954,000)	(2,891,000)
Proceeds from issuance of common stock under employee stock plans	15,339,000	12,770,000
Proceeds from Issuance of Common Stock	271,411,000	0
Payments for repurchase of common stock	0	(8,830,000)
Tax payments related to shares withheld for vested restricted stock units	(4,762,000)	(2,974,000)
Excess tax benefit from stock-based compensation	5,472,000	3,828,000
Net cash provided by financing activities	284,506,000	1,903,000
NET INCREASE IN CASH AND CASH EQUIVALENTS	310,143,000	25,661,000
CASH AND CASH EQUIVALENTS, Beginning of period	34,396,000	26,756,000
CASH AND CASH EQUIVALENTS, End of period	344,539,000	52,417,000
Supplemental disclosure of cash flow information:
Cash paid for interest	213,000	101,000
Cash paid for income taxes	218,000	15,000
Supplemental disclosure of non-cash investing and financing activities:
Fixed asset purchases accrued but not paid	1,196,000	3,055,000
Stock-based compensation capitalized to property and equipment	1,927,000	705,000
Acquisition of property and equipment under capital leases	$ 0	$ 6,998,000

Description of Business

Description of Business	9 Months Ended
	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Ellie Mae, Inc. (“Ellie Mae,” “the Company,” “we,” “our” or “us”) is a leading provider of innovative on-demand software solutions and services for the residential mortgage industry in the United States . The Company’s Encompass all-in-one mortgage management solution provides one system of record that allows banks, credit unions, and mortgage lenders to originate and fund mortgages and improve compliance, loan quality, and efficiency .

Basis of Presentation and Signi

Basis of Presentation and Significant Accounting Policies	9 Months Ended
	Sep. 30, 2016
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“ U.S. GAAP ”) and applicable rules and regulations of the Securities and Exchange Commission (“ SEC ”) regarding interim financial reporting. Certain information and note disclosures included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 , which was filed with the SEC on February 25, 2016 (“ 2015 Form 10-K ”). The condensed consolidated balance sheet as of December 31, 2015 , included herein, was derived from the audited financial statements as of that date but does not include all disclosures, including notes required by U.S. GAAP . In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial positions, results of operations and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full year 2016 or any future period. Principles of Consolidation The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated. Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Management evaluates estimates on a regular basis including those relating to revenue recognition, allowance for doubtful accounts, goodwill, intangible assets, valuation of deferred income taxes, stock-based compensation, and unrecognized tax benefits, among others. Actual results could differ from those estimates and such differences may have a material impact on the Company’s condensed consolidated financial statements and footnotes. Significant Accounting Policies The Company’s significant accounting policies are described in Note 2 of the Notes to Consolidated Financial Statements in its 2015 Form 10-K . There have been no significant changes to these policies during the nine months ended September 30, 2016 . Comprehensive Income Comprehensive income consists of net income and other comprehensive income . Other comprehensive income includes certain changes in equity that are excluded from net income, specifically unrealized gains on marketable securities. Except for net realized gain on investments which was not significant, there were no reclassifications out of accumulated other comprehensive income that affected net income during the three and nine months ended September 30, 2016 and 2015 . Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (“ FASB ”) issued Accounting Standards Update (“ ASU ”) No. 2014-09, Revenue from Contracts with Customers (“ ASU 2014-09 ”), which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. This standard also requires significantly expanded disclosures about revenue recognition. In August 2015, the FASB deferred the effective date of this standard by one year. In March, April and May 2016, the FASB clarified the implementation guidance on principal versus agent, identifying performance obligations, licensing, collectability, noncash consideration, presentation of sales tax, and certain other transition matters. The new effective date for public entities will be for fiscal years, and interim periods within those years, beginning after December 15, 2017, but entities will be permitted to early adopt the standard as of the original effective date. This standard may be applied retrospectively to each prior period presented or with the cumulative effect recognized as of the date of initial application. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments-Overall: Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”), which updates certain aspects of recognition, measurement, presentation and disclosure of financial instruments. ASU 2016-01 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017, and early adoption is not permitted. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”), which requires lessees to put most leases on their balance sheets but recognize the expenses on their income statements in a manner similar to current practice. ASU 2016-02 states that a lessee would recognize a lease liability for the obligation to make lease payments and a right-to-use asset for the right to use the underlying asset for the lease term. The new standard is effective for interim and annual periods beginning after December 15, 2018, and early adoption is permitted. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-09, Compensation—Stock Compensation (Topic 718) (“ASU 2016-09”). This standard makes several modifications to Topic 718 related to the accounting for forfeitures, employer tax withholding on share-based compensation and the financial statement presentation of excess tax benefits or deficiencies. ASU 2016-09 also clarifies the statement of cash flows presentation for certain components of share-based awards. The standard is effective for interim and annual reporting periods beginning after December 15, 2016, and early adoption is permitted. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements.

Net Income (Loss) Per Share of

Net Income (Loss) Per Share of Common Stock	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Net Income (Loss) Per Share of Common Stock	Net income per share of common stock is calculated by dividing net income by the weighted average shares of common stock outstanding during the period. Diluted net income per share of common stock is calculated by dividing net income by the weighted average shares of common stock outstanding and potential shares of common stock during the period. Potential shares of common stock include dilutive shares attributable to the assumed exercise of stock options, restricted stock unit awards (“ RSU s”), performance-vesting RSUs, performance share awards (“ Performance Awards ”), and Employee Stock Purchase Plan (“ ESPP ”) shares using the treasury stock method, if dilutive. The components of net income per share of common stock were as follows: Three Months ended September 30, Nine Months ended September 30, 2016 2015 2016 2015 (in thousands, except share and per share amounts) Net income $ 13,780 $ 6,222 $ 26,874 $ 17,436 Basic shares: Weighted average common shares outstanding 31,916,910 29,363,621 30,407,020 29,076,820 Diluted shares: Weighted average shares used to compute basic net income per share 31,916,910 29,363,621 30,407,020 29,076,820 Effect of potentially dilutive securities: Employee stock options, RSUs, performance-vesting RSUs, Performance Awards and ESPP shares 1,565,623 1,642,030 1,632,063 1,696,533 Weighted average shares used to compute diluted net income per share 33,482,533 31,005,651 32,039,083 30,773,353 Net income per share: Basic $ 0.43 $ 0.21 $ 0.88 $ 0.60 Diluted $ 0.41 $ 0.20 $ 0.84 $ 0.57 The following potential weighted average common shares were excluded from the computation of diluted net income per share, as their effect would have been anti-dilutive: Three Months ended September 30, Nine Months ended September 30, 2016 2015 2016 2015 Employee stock options and awards — 306,377 42,036 230,106 Performance-vesting RSUs and Performance Awards are included in the diluted shares outstanding for each period if the established performance criteria have been met at the end of the respective periods. However, if none of the required performance criteria have been met for such awards, the Company includes the number of shares that would be issuable if the end of the reporting period were the end of the contingency period. Accordingly, in addition to the employee stock options and awards noted above, 167,336 and 214,014 shares underlying performance-vesting RSUs and Performance Awards were excluded from the dilutive shares outstanding for each of the three and nine months ended September 30, 2016 and 2015 , respectively.

Financial Instruments and Fair

Financial Instruments and Fair Value Measurements	9 Months Ended
	Sep. 30, 2016
Financial Instruments and Fair Value Measurements [Abstract]
Financial Instruments and Fair Value Measurements	Fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements are classified and disclosed in one of the following three categories: Level 1 — Valuations based on quoted prices in active markets for identical assets or liabilities. Level 2 — Valuations based on other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, 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 — Valuations based on inputs that are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the assets or liabilities. The following tables set forth by level within the fair value hierarchy the Company’s financial assets that were accounted for at fair value on a recurring basis: Fair Value at Fair Value Measurements Using Inputs Considered as September 30, 2016 Level 1 Level 2 (in thousands) Cash equivalents: Money market funds $ 4,377 $ 4,377 $ — U.S. government and government agency obligations 300,013 149,964 150,049 Investments: Certificates of deposit 12,138 — 12,138 Corporate notes and obligations 31,770 — 31,770 Municipal obligations 7,681 — 7,681 U.S. government and government agency obligations 36,109 5,297 30,812 $ 392,088 $ 159,638 $ 232,450 Fair Value at Fair Value Measurements Using Inputs Considered as December 31, 2015 Level 1 Level 2 (in thousands) Cash equivalents: Money market funds $ 6,788 $ 6,788 $ — Investments: Certificates of deposit 12,928 — 12,928 Corporate notes and obligations 28,205 — 28,205 Municipal obligations 2,648 — 2,648 U.S. government and government agency obligations 60,667 19,429 41,238 $ 111,236 $ 26,217 $ 85,019 The Company classifies its money market funds that are specifically backed by debt securities and U.S. government obligations as Level 1 instruments, due to the use of observable market prices for identical securities that are traded in active markets . Valuation of the Company’s marketable securities investments classified as Level 2 is achieved primarily through broker quotes when such investments exist in a non-active market. At September 30, 2016 and December 31, 2015 , the Company did not have any assets or liabilities that were valued using Level 3 inputs. For the three and nine months ended September 30, 2016 and 2015 , there were no transfers of financial instruments between the levels. For the three and nine months ended September 30, 2016 , the Company recognized interest income from financial instruments of $0.2 million and $0.6 million , respectively. For the three and nine months ended September 30, 2015 , the Company recognized interest income from financial instruments of $0.2 million and $0.5 million , respectively. Gross realized gains and losses from the sale of investments were not significant during the three and nine months ended September 30, 2016 and 2015 . At September 30, 2016 , $348.1 million of the Company's marketable securities had a contractual maturity of one year or less and $44.0 million had a contractual maturity of one to three years. The carrying amounts, gross unrealized gains and losses and estimated fair value of cash and cash equivalents and both short-term and long-term investments consisted of the following: September 30, 2016 Amortized Cost Unrealized Gains Unrealized Losses Carrying or Fair Value (in thousands) Cash and cash equivalents: Cash $ 40,149 $ — $ — $ 40,149 Money market funds 4,377 — — 4,377 U.S. government and government agency obligations 299,999 14 — 300,013 $ 344,525 $ 14 $ — $ 344,539 Investments: Corporate notes and obligations $ 31,775 $ 24 $ (29 ) $ 31,770 Certificates of deposit 12,097 45 (4 ) 12,138 Municipal obligations 7,689 2 (10 ) 7,681 U.S. government and government agency obligations 36,086 35 (12 ) 36,109 $ 87,647 $ 106 $ (55 ) $ 87,698 December 31, 2015 Amortized Cost Unrealized Gains Unrealized Losses Carrying or Fair Value (in thousands) Cash and cash equivalents: Cash $ 27,608 $ — $ — $ 27,608 Money market funds 6,788 — — 6,788 $ 34,396 $ — $ — $ 34,396 Investments: Corporate notes and obligations $ 28,314 $ 1 $ (110 ) $ 28,205 Certificates of deposit 12,945 5 (22 ) 12,928 Municipal obligations 2,647 1 — 2,648 U.S. government and government agency obligations 60,799 10 (142 ) 60,667 $ 104,705 $ 17 $ (274 ) $ 104,448 The following table shows the gross unrealized losses and the related fair values of the Company’s investments that have been in a continuous unrealized loss position. The Company did not identify any investments as other-than-temporarily impaired at September 30, 2016 or December 31, 2015 . September 30, 2016 Less than 12 Months 12 Months or Greater Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in thousands) Corporate notes and obligations $ 16,858 $ (29 ) $ — $ — $ 16,858 $ (29 ) Certificates of deposit 2,200 (4 ) — — 2,200 (4 ) U.S. government, government agency, and municipal obligations 62,114 (22 ) 385 — 62,499 (22 ) $ 81,172 $ (55 ) $ 385 $ — $ 81,557 $ (55 ) December 31, 2015 Less than 12 Months 12 Months or Greater Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in thousands) Corporate notes and obligations $ 23,969 $ (99 ) $ 2,514 $ (11 ) $ 26,483 $ (110 ) Certificates of deposit 9,284 (22 ) — — 9,284 (22 ) U.S. government, government agency, and municipal obligations 48,394 (139 ) 1,793 (3 ) 50,187 (142 ) $ 81,647 $ (260 ) $ 4,307 $ (14 ) $ 85,954 $ (274 ) The following table summarizes the maturities of the Company’s investments at September 30, 2016 : Carrying or Fair Value (in thousands) Remainder of 2016 $ 11,058 2017 38,705 2018 27,542 2019 10,393 Thereafter — Total $ 87,698 Actual maturities may differ from the contractual maturities because borrowers may have the right to call or prepay certain obligations.

Balance Sheet Components (Notes

Balance Sheet Components (Notes)	9 Months Ended
	Sep. 30, 2016
Supplemental Balance Sheet Disclosures [Text Block]	Property and Equipment Property and equipment, net, consisted of the following: September 30, December 31, 2016 2015 (in thousands) Computer equipment and software (1) $ 94,197 $ 55,928 Furniture and fixtures 6,837 5,292 Leasehold improvements 18,532 14,405 Property and equipment 119,566 75,625 Accumulated depreciation and amortization (1) (43,018 ) (28,552 ) Net property and equipment 76,548 47,073 Internal-use software and other assets not placed in service 36,073 34,287 $ 112,621 $ 81,360 ________________ (1) Includes computer equipment and software under capital leases Computer equipment and software under capital leases, net, consisted of the following: September 30, December 31, 2016 2015 (in thousands) Computer equipment $ 8,715 $ 8,715 Software 1,516 1,517 Accumulated amortization (5,760 ) (3,371 ) Net computer equipment and software under capital leases $ 4,471 $ 6,861 Depreciation expense for the three and nine months ended September 30, 2016 was $5.8 million and $14.5 million , respectively. Depreciation expense for the three and nine months ended September 30, 2015 was $3.0 million and $7.3 million , respectively. Amortization of assets under capital leases which is included in depreciation expense for the three and nine months ended September 30, 2016 was $0.8 million and $2.4 million , respectively. Amortization of assets under capital leases which is included in depreciation expense for the three and nine months ended September 30, 2015 was $0.7 million and $1.6 million , respectively. Accrued and Other Current Liabilities Accrued and other current liabilities consisted of the following: September 30, December 31, 2016 2015 (in thousands) Accrued payroll and related expenses $ 21,713 $ 23,938 Accrued commissions 1,151 1,993 Accrued professional fees 257 223 Accrued royalties 1,779 1,546 Sales and other taxes 2,212 1,536 Current portion of leases payable 1,460 3,845 Other accrued expenses 1,534 4,226 $ 30,106 $ 37,307

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	The carrying value of goodwill at September 30, 2016 was $74.5 million . There were no changes in the carrying value of goodwill during the three and nine months ended September 30, 2016 . Other intangible assets, net, consisted of the following: September 30, 2016 Gross Carrying Accumulated Net Intangibles Weighted Average Remaining Useful Life (in thousands) (in years) Assets subject to amortization: Developed technology $ 11,535 $ (7,850 ) $ 3,685 3.0 Trade names 331 (329 ) 2 0.1 Customer relationships 19,400 (9,041 ) 10,359 4.2 Order backlog 370 (87 ) 283 3.1 Total assets subject to amortization: 31,636 (17,307 ) 14,329 3.8 Assets not subject to amortization: Trade name 4,039 — 4,039 $ 35,675 $ (17,307 ) $ 18,368 December 31, 2015 Gross Carrying Accumulated Net Intangibles Weighted Average Remaining Useful Life (in thousands) (in years) Assets subject to amortization: Developed technology $ 11,535 $ (5,668 ) $ 5,867 3.1 Trade names 331 (307 ) 24 0.8 Customer relationships 19,400 (6,875 ) 12,525 4.8 Order backlog 370 (15 ) 355 3.8 Total assets subject to amortization: 31,636 (12,865 ) 18,771 4.2 Assets not subject to amortization: Trade name 4,039 — 4,039 $ 35,675 $ (12,865 ) $ 22,810 Amortization expense associated with intangible assets for the three and nine months ended September 30, 2016 was $1.5 million and $4.4 million , respectively. Amortization expense associated with intangible assets for the three and nine months ended September 30, 2015 was $1.2 million and $3.7 million , respectively. Minimum future amortization expense for intangible assets at September 30, 2016 was as follows: Amortization (in thousands) Remainder of 2016 $ 1,079 2017 4,294 2018 3,443 2019 3,166 2020 1,778 2021 314 Thereafter 255 $ 14,329

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	The Company computes its interim provision for income taxes by applying the estimated annual effective tax rate to the year-to-date income from recurring operations and adjusts the provision for discrete tax items recorded in the period. The Company evaluates and updates its estimated annual effective income tax rate on a quarterly basis. The estimated annual effective tax rate as of September 30, 2016 and 2015 was 36.5% and 40.6% , respectively. Three Months ended September 30, Nine Months ended September 30, 2016 2015 2016 2015 (dollars in thousands) Income tax provision $ 7,492 $ 3,552 $ 14,966 $ 11,948 Effective tax rate 35.2 % 36.3 % 35.8 % 40.7 % The difference between the federal statutory rate of 35% and the Company’s estimated effective tax rate for the three and nine months ended September 30, 2016 was primarily due to the Company’s state income tax provision, non-deductible stock-based compensation expenses, and offset by R&D credits. The Company realized a tax benefit of $4.2 million and $5.5 million for the three and nine months ended September 30, 2016 related to the exercise of employee stock options and the vesting of RSUs, performance-vesting RSUs and Performance Awards. The Company recognized a charge of $24,000 for the three months ended September 30, 2015 related to the adjustments made to the tax benefit for the exercise of employee stock options and the vesting of RSUs, performance-vesting RSUs and Performance Award. The Company recorded a tax benefit of $3.8 million for the nine months ended September 30, 2015 related to the exercise of employee stock options and the vesting of RSUs, performance-vesting RSUs and Performance Awards. The net income tax benefit in excess of the expenses recorded for financial reporting purposes has been recorded as an increase to additional paid-in capital and is reflected as a financing cash inflow in the condensed consolidated statements of cash flows. The Company’s tax positions are subject to income tax audits by multiple tax jurisdictions. The Company accounts for uncertain tax positions and believes that it has provided adequate reserves for its unrecognized tax benefits for all tax years still open for assessment. The Company also believes that it does not have any tax positions for which it is reasonably possible that the total amounts of unrecognized tax benefits will significantly increase or decrease within the next twelve months. The Company has a policy to classify accrued interest and penalties associated with uncertain tax positions together with the related liability in the balance sheet, and to include the expenses incurred related to such accruals in the provision for income taxes. There were no interest or penalties included in the provision for income taxes during the nine months ended September 30, 2016 and 2015 , respectively. The Company is currently under examination by the U.S. Internal Revenue Service for the 2013 tax year. At this time, the Company is not able to estimate the potential impact that the examination may have on income tax expense. If the examination is resolved unfavorably, it may have a negative impact on the Company’s results of operations.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Leases As of September 30, 2016 , the Company leased eight facilities under operating lease arrangements. The lease expiration dates range from August 2017 to December 2025 . Certain leases contain escalation clauses calling for increased rents. The Company recognizes rent expense on a straight-line basis over the lease period and has recorded deferred rent for the difference between rent payments and rent expense recognized. Pursuant to the expiration of the Company’s Irvine office lease, in February 2016, the Company entered into a new lease agreement for approximately 4,600 square feet of office space in Irvine, California. The term of the lease commenced on June 1, 2016 with an initial term of 60 months, with payments ranging from $ 12,800 per month to $ 15,000 per month. In July 2016, the Company entered into an amendment to its existing office lease in Pleasanton, California to expand office space by four floors, approximating 143,500 square feet and extend the lease to the existing premises by one year to December 31, 2025. The term of the lease for two of the four floors will commence on April 1, 2017 and for the remaining two floors, will commence on February 1, 2018. The term of the lease for the aggregate leased space ends on December 31, 2025 with payments ranging from approximately $ 201,600 per month to $ 527,300 per month during the lease period. Pursuant to the expiration of the Company’s Omaha office lease, in August 2016, the Company entered into a new lease agreement for approximately 20,100 square feet of office space in Omaha, Nebraska. The term of the lease will commence on January 1, 2017 with an initial term of 68 months, with payments ranging from $ 25,600 per month to $ 37,900 per month. Future minimum lease payments under noncancelable operating and capital leases at September 30, 2016 consisted of the following: Capital Leases Operating Leases (in thousands) 2016 $ 897 $ 1,275 2017 618 6,174 2018 87 10,127 2019 — 10,687 2020 — 10,840 2021 — 10,976 Thereafter — 45,446 Total minimum lease payments 1,602 $ 95,525 Less amount representing interest (25 ) Present value of minimum lease payments 1,577 Less current portion (1,460 ) Long-term portion of lease obligations $ 117 Legal Proceedings From time to time, the Company is involved in litigation that it believes is of the type common to companies engaged in the Company’s line of business, including commercial and employment disputes. As of the date of this Quarterly Report on Form 10-Q, the Company is not involved in any pending legal proceedings whose outcome the Company expects to have a material adverse effect on its financial position, results of operations or cash flows. However, litigation is unpredictable and excessive verdicts, both in the form of monetary damages and injunctions, could occur. In the future, litigation could result in substantial costs and diversion of resources and the Company could incur judgments or enter into settlements of claims that could have a material adverse effect on its business. The Company is currently under audit by an enterprise software provider in connection with the Company's compliance with the terms of the applicable license agreement. Although there is a possibility of a claim, the Company believes it has properly complied with the terms of the license agreement and will vigorously defend any related claims. Any potential liabilities related to the audit are currently not estimable.

Stock Incentive Plans

Stock Incentive Plans	9 Months Ended
	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Incentive Plans	The Company recognized stock-based compensation expense related to awards granted under its 2009 Stock Option and Incentive Plan (the “2009 Plan”), 2011 Equity Incentive Award Plan (the “ 2011 Plan ”), and ESPP . Total stock-based compensation expense recognized consisted of: Three Months ended September 30, Nine Months ended September 30, 2016 2015 2016 2015 (in thousands) Cost of revenues $ 1,381 $ 761 $ 3,483 $ 2,189 Sales and marketing 1,243 783 3,180 1,973 Research and development 1,969 1,438 5,417 3,961 General and administrative 4,155 3,538 11,376 9,481 $ 8,748 $ 6,520 $ 23,456 $ 17,604 2009 Stock Option and Incentive Plan and 2011 Equity Incentive Award Plan Stock Options The following table summarizes the Company’s stock option activity under the 2009 Plan and 2011 Plan : Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (in years) (in thousands) Outstanding at January 1, 2016 2,515,329 $ 24.40 7.14 $ 90,818 Granted 14,506 59.78 Exercised (467,268 ) 18.27 Forfeited or expired (57,591 ) 37.84 Outstanding at September 30, 2016 2,004,976 $ 25.70 6.53 $ 159,591 Ending vested and expected to vest at September 30, 2016 1,978,586 $ 25.48 6.51 $ 157,922 Exercisable at September 30, 2016 1,425,363 $ 20.54 5.98 $ 120,810 There were no stock options granted during the three months ended September 30, 2016 . Stock options granted during the nine months ended September 30, 2016 were made under the 2011 Plan. There were no grants under the 2009 Plan during the nine months ended September 30, 2016 . The aggregate intrinsic value of the stock options outstanding at September 30, 2016 represents the value of the Company’s closing stock price of $105.30 on September 30, 2016 in excess of the exercise price multiplied by the number of options outstanding for options that were in-the-money. Options outstanding that are expected to vest are net of estimated future option forfeitures. Following is additional information pertaining to the Company’s stock option activity: Three Months ended September 30, Nine Months ended September 30, 2016 2015 2016 2015 (in thousands, except per option amounts) Weighted average fair value per option granted $ — $ 34.39 $ 27.57 $ 26.13 Grant-date fair value of options vested $ 1,787 $ 1,678 $ 7,079 $ 6,026 Intrinsic value of options exercised $ 9,058 $ 10,227 $ 30,302 $ 33,343 Proceeds received from options exercised $ 2,280 $ 1,807 $ 8,535 $ 8,665 As of September 30, 2016 , total unrecognized stock-based compensation expense related to unvested stock options, adjusted for estimated forfeitures, was $9.9 million and is expected to be recognized over a weighted average period of 1.9 years. Restricted Stock Units, Performance-Vesting Restricted Stock Units, and Performance Awards The fair value of the Company’s RSUs and Performance Awards is measured based upon the closing price of its underlying common stock as of the grant date and is recognized over the vesting term. Upon vesting, RSUs convert into an equivalent number of shares of common stock. The Performance Awards granted represent the right to receive shares of the Company’s common stock, contingent upon the achievement of certain of the Company’s performance metrics during the performance period. On a date subsequent to the performance period, the Compensation Committee of the Board of Directors (the “ Compensation Committee ”) determines and approves the achievement of the performance goals (the “ Determination Date ”) and the earned shares are issued, with 25% of the shares vested upon issuance and the remaining shares to vest 25% on each of the first three anniversaries of the Determination Date , subject to the continuous employment of the participant through such dates. In October 2015, in connection with the acquisition of Mortgage Returns, the Company agreed to pay up to 29,006 of performance-vesting RSUs for a total value of $2.0 million to the former Chief Executive Officer of Mortgage Returns upon achievement of certain performance criteria and a service requirement during the performance period of October 23, 2015 through October 23, 2019. The performance-vesting RSUs will vest annually based on the achievement of the performance criteria and the service requirement. In February 2016, the Company granted Sigmund Anderman, current Chairman of the Board of Directors of the Company (“Mr. Anderman”), 6,692 performance-vesting RSUs and an option to purchase 14,506 shares of Company common stock. Mr. Anderman may earn between zero and 2.0 shares of common stock for each performance-vesting RSU. As of September 30, 2016 , the Company expects that each of these performance-vesting RSUs will convert to 1.41 shares of common stock on the Determination Date in 2017. Additionally, in February 2016, the Company granted 64,449 Performance Awards with a performance period of January 1, 2016 through December 31, 2016 to the Company’s executives under the 2011 Plan. The designated participants may earn between zero and 2.0 shares of common stock for each Performance Award. As of September 30, 2016, the Company expects that each of these Performance Awards will convert to 2.0 shares of common stock on the Determination Date in 2017. The following table summarizes the Company’s RSU , Performance Award and performance-vesting RSU activity: RSUs Performance Awards and Performance-Vesting RSUs Number of Shares Weighted Average Grant Date Fair Value Per Share Number of Shares Weighted Average Grant Date Fair Value Per Share Outstanding at January 1, 2016 748,688 $ 45.52 508,282 $ 34.68 Granted 535,527 77.59 138,330 59.78 Released (201,272 ) 41.17 (236,219 ) 28.87 Forfeited or expired (75,141 ) 56.56 — — Outstanding at September 30, 2016 1,007,802 $ 62.61 410,393 $ 46.48 Ending vested and expected to vest at September 30, 2016 891,284 410,393 RSU s, performance-vesting RSUs and Performance Awards that are expected to vest are presented net of estimated future forfeitures. RSU s released during the nine months ended September 30, 2016 and 2015 had an aggregate intrinsic value of $16.8 million and $9.6 million , respectively, and had an aggregate grant-date fair value of $8.3 million and $3.8 million , respectively. Performance-vesting RSUs and Performance Awards released during the nine months ended September 30, 2016 and 2015 had an aggregate intrinsic value of $21.6 million and $13.2 million , respectively, and had an aggregate grant-date fair value of $6.8 million and $4.5 million , respectively. The number of RSU s released includes shares that the Company withheld on behalf of employees to satisfy the minimum statutory tax withholding requirements. As of September 30, 2016 , total unrecognized compensation expense related to unvested RSU s, performance-vesting RSUs and Performance Awards was $56.2 million and is expected to be recognized over a weighted average period of 2.6 years. Employee Stock Purchase Plan For the nine months ended September 30, 2016 and 2015 , employees purchased 101,816 shares and 110,598 shares, respectively, under the ESPP for a total of $6.7 million and $4.1 million , respectively. As of September 30, 2016 , unrecognized compensation expense related to the current semi-annual ESPP period, which ends on February 27, 2017 , was $1.0 million and is expected to be recognized over five months. Executive Incentive Plan On March 14, 2016, the compensation committee adopted the Ellie Mae, Inc. Executive Incentive Plan (the “Executive Incentive Plan”). The Executive Incentive Plan was approved by the Company’s stockholders on May 25, 2016. The Executive Incentive Plan has a term of five years from the date of approval by the stockholders, expiring May 25, 2021, and may be terminated, amended or suspended by the compensation committee at any prior time, and may also be reinstated. The Company currently expects to issue cash bonus and performance-based equity awards under the Executive Incentive Plan to the Company’s executive officers commencing in 2017. Shares underlying equity awards from the Executive Incentive Plan will be issued from our 2011 Plan. The equity awards have the following limitations: Stock Option Limitations. The maximum number of shares that may be granted as an incentive stock option under the Executive Incentive Plan is 70,000,000. No participant will be eligible to receive a stock option covering more than 1,000,000 shares in any calendar year. Performance Units/Performance Share Limitations. No participant will be eligible to receive performance units or performance shares having a grant date value (assuming maximum payout) greater than $10,000,000 or covering more than 1,000,000 shares, whichever is greater, in any calendar year. Valuation Information The fair value of stock options and stock purchase rights granted under the 2009 Plan, the 2011 Plan , and the ESPP were estimated at the date of grant using the Black-Scholes option valuation model with the following weighted average assumptions: Three months ended September 30, Nine Months ended September 30, 2016 2015 2016 2015 Stock option plans: Risk-free interest rate — % 1.87 % 1.38 % 1.75 % Expected life of options (in years) 0 6.08 6.08 5.99 Expected dividend yield — % — % — % — % Volatility — % 48 % 47 % 48 % Employee Stock Purchase Plan: Risk-free interest rate 0.46 % 0.24 % 0.36 % 0.19 % Expected life of options (in years) 0.50 0.50 0.50 0.50 Expected dividend yield — % — % — % — % Volatility 33 % 44 % 38 % 39 % Common Stock The following numbers of shares of common stock were reserved and available for future issuance at September 30, 2016 : Reserved Shares Options and awards outstanding under stock option plans 3,423,171 Shares available for future grant under the 2011 Equity Incentive Award Plan 3,896,188 Shares available under the Employee Stock Purchase Plan 1,398,843 Total 8,718,202 In February 2016 , 295,665 additional shares were reserved under the ESPP and 1,478,325 additional shares were reserved under the 2011 Plan , pursuant to the automatic increase provisions in each plan. Stock Offering In August 2016 , the Company completed a public offering of common stock and sold a total of 3,162,500 shares of its common stock for total cash proceeds of approximately $271.4 million , net of underwriting discounts, and offering costs and expenses of approximately $13.2 million . Stock Repurchase Program In May 2014 , the Company’s board of directors approved a stock repurchase program under which the Company is authorized to repurchase up to $75.0 million of its common stock , which expires in May 2017 . All shares are retired upon repurchase. The Company did not repurchase any shares during the nine months ended September 30, 2016 . As of September 30, 2016 , $43.5 million remained available for future repurchases under the program.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Segment Information	The Company operates in one industry—mortgage-related software and services. The Company’s chief operating decision maker is its chief executive officer, who makes decisions about resource allocation and reviews financial information presented on a consolidated basis. Accordingly, the Company has determined that it has a single reporting segment and operating unit structure, specifically technology-enabled solutions to help streamline and automate the residential mortgage origination process for its network participants. The Company is organized primarily on the basis of service lines. Supplemental disclosure of revenues by type is as follows: Three months ended September 30, Nine Months ended September 30, 2016 2015 2016 2015 (in thousands) On-demand revenues (1) $ 100,381 $ 68,019 $ 263,386 $ 185,776 On-premise revenues (1) — 920 718 3,294 $ 100,381 $ 68,939 $ 264,104 $ 189,070 ________________ (1) Certain reclassifications of prior period amounts have been made to conform to the current period presentation, such reclassification did not materially change previously reported consolidated financial statements. On-demand revenue is generated from company-hosted software subscriptions that customers access through the Internet. On-demand revenue is comprised of fees for software services sold both as a subscription and transactionally including fees based on a per closed loan, or success basis, subject to monthly base fees, which the Company refers to as Success-Based Pricing; Ellie Mae Network fees; education and training, loan product, policy and guideline data and analytics services under the AllRegs brand; and professional services which include consulting, implementation, and training services. On-premise revenue is generated from maintenance services, sales of customer-hosted Encompass software licenses, and related professional services. Effective May 1, 2016, the Company no longer provides software releases or technical support for the on-premise version of Encompass. As of June 30, 2016 , all on-premise customers completed the migration to our on-demand Encompass offering, and we do not expect significant future on-premise revenues.

Basis of Presentation and Sig16

Basis of Presentation and Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2016
Accounting Policies [Abstract]
Principles of Consolidation [Policy Text Block]	Principles of Consolidation The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Management evaluates estimates on a regular basis including those relating to revenue recognition, allowance for doubtful accounts, goodwill, intangible assets, valuation of deferred income taxes, stock-based compensation, and unrecognized tax benefits, among others. Actual results could differ from those estimates and such differences may have a material impact on the Company’s condensed consolidated financial statements and footnotes.
Significant Accounting Policies [Text Block]	Significant Accounting Policies The Company’s significant accounting policies are described in Note 2 of the Notes to Consolidated Financial Statements in its 2015 Form 10-K . There have been no significant changes to these policies during the nine months ended September 30, 2016 .
Comprehensive Income [Policy Text Block]	Comprehensive Income Comprehensive income consists of net income and other comprehensive income . Other comprehensive income includes certain changes in equity that are excluded from net income, specifically unrealized gains on marketable securities. Except for net realized gain on investments which was not significant, there were no reclassifications out of accumulated other comprehensive income that affected net income during the three and nine months ended September 30, 2016 and 2015
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (“ FASB ”) issued Accounting Standards Update (“ ASU ”) No. 2014-09, Revenue from Contracts with Customers (“ ASU 2014-09 ”), which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. This standard also requires significantly expanded disclosures about revenue recognition. In August 2015, the FASB deferred the effective date of this standard by one year. In March, April and May 2016, the FASB clarified the implementation guidance on principal versus agent, identifying performance obligations, licensing, collectability, noncash consideration, presentation of sales tax, and certain other transition matters. The new effective date for public entities will be for fiscal years, and interim periods within those years, beginning after December 15, 2017, but entities will be permitted to early adopt the standard as of the original effective date. This standard may be applied retrospectively to each prior period presented or with the cumulative effect recognized as of the date of initial application. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments-Overall: Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”), which updates certain aspects of recognition, measurement, presentation and disclosure of financial instruments. ASU 2016-01 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017, and early adoption is not permitted. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”), which requires lessees to put most leases on their balance sheets but recognize the expenses on their income statements in a manner similar to current practice. ASU 2016-02 states that a lessee would recognize a lease liability for the obligation to make lease payments and a right-to-use asset for the right to use the underlying asset for the lease term. The new standard is effective for interim and annual periods beginning after December 15, 2018, and early adoption is permitted. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-09, Compensation—Stock Compensation (Topic 718) (“ASU 2016-09”). This standard makes several modifications to Topic 718 related to the accounting for forfeitures, employer tax withholding on share-based compensation and the financial statement presentation of excess tax benefits or deficiencies. ASU 2016-09 also clarifies the statement of cash flows presentation for certain components of share-based awards. The standard is effective for interim and annual reporting periods beginning after December 15, 2016, and early adoption is permitted. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements.

Net Income (Loss) Per Share o17

Net Income (Loss) Per Share of Common Stock (Tables)	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Components of net income (loss) per share of common stock	The components of net income per share of common stock were as follows: Three Months ended September 30, Nine Months ended September 30, 2016 2015 2016 2015 (in thousands, except share and per share amounts) Net income $ 13,780 $ 6,222 $ 26,874 $ 17,436 Basic shares: Weighted average common shares outstanding 31,916,910 29,363,621 30,407,020 29,076,820 Diluted shares: Weighted average shares used to compute basic net income per share 31,916,910 29,363,621 30,407,020 29,076,820 Effect of potentially dilutive securities: Employee stock options, RSUs, performance-vesting RSUs, Performance Awards and ESPP shares 1,565,623 1,642,030 1,632,063 1,696,533 Weighted average shares used to compute diluted net income per share 33,482,533 31,005,651 32,039,083 30,773,353 Net income per share: Basic $ 0.43 $ 0.21 $ 0.88 $ 0.60 Diluted $ 0.41 $ 0.20 $ 0.84 $ 0.57
Common shares excluded from computation of diluted net income (loss) per share	The following potential weighted average common shares were excluded from the computation of diluted net income per share, as their effect would have been anti-dilutive: Three Months ended September 30, Nine Months ended September 30, 2016 2015 2016 2015 Employee stock options and awards — 306,377 42,036 230,106

Financial Instruments and Fai18

Financial Instruments and Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2016
Financial Instruments and Fair Value Measurements [Abstract]
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]	The carrying amounts, gross unrealized gains and losses and estimated fair value of cash and cash equivalents and both short-term and long-term investments consisted of the following: September 30, 2016 Amortized Cost Unrealized Gains Unrealized Losses Carrying or Fair Value (in thousands) Cash and cash equivalents: Cash $ 40,149 $ — $ — $ 40,149 Money market funds 4,377 — — 4,377 U.S. government and government agency obligations 299,999 14 — 300,013 $ 344,525 $ 14 $ — $ 344,539 Investments: Corporate notes and obligations $ 31,775 $ 24 $ (29 ) $ 31,770 Certificates of deposit 12,097 45 (4 ) 12,138 Municipal obligations 7,689 2 (10 ) 7,681 U.S. government and government agency obligations 36,086 35 (12 ) 36,109 $ 87,647 $ 106 $ (55 ) $ 87,698 December 31, 2015 Amortized Cost Unrealized Gains Unrealized Losses Carrying or Fair Value (in thousands) Cash and cash equivalents: Cash $ 27,608 $ — $ — $ 27,608 Money market funds 6,788 — — 6,788 $ 34,396 $ — $ — $ 34,396 Investments: Corporate notes and obligations $ 28,314 $ 1 $ (110 ) $ 28,205 Certificates of deposit 12,945 5 (22 ) 12,928 Municipal obligations 2,647 1 — 2,648 U.S. government and government agency obligations 60,799 10 (142 ) 60,667 $ 104,705 $ 17 $ (274 ) $ 104,448
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]	The following table shows the gross unrealized losses and the related fair values of the Company’s investments that have been in a continuous unrealized loss position. The Company did not identify any investments as other-than-temporarily impaired at September 30, 2016 or December 31, 2015 . September 30, 2016 Less than 12 Months 12 Months or Greater Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in thousands) Corporate notes and obligations $ 16,858 $ (29 ) $ — $ — $ 16,858 $ (29 ) Certificates of deposit 2,200 (4 ) — — 2,200 (4 ) U.S. government, government agency, and municipal obligations 62,114 (22 ) 385 — 62,499 (22 ) $ 81,172 $ (55 ) $ 385 $ — $ 81,557 $ (55 ) December 31, 2015 Less than 12 Months 12 Months or Greater Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in thousands) Corporate notes and obligations $ 23,969 $ (99 ) $ 2,514 $ (11 ) $ 26,483 $ (110 ) Certificates of deposit 9,284 (22 ) — — 9,284 (22 ) U.S. government, government agency, and municipal obligations 48,394 (139 ) 1,793 (3 ) 50,187 (142 ) $ 81,647 $ (260 ) $ 4,307 $ (14 ) $ 85,954 $ (274 )
Fair value hierarchy of Company's financial assets on recurring basis	The following tables set forth by level within the fair value hierarchy the Company’s financial assets that were accounted for at fair value on a recurring basis: Fair Value at Fair Value Measurements Using Inputs Considered as September 30, 2016 Level 1 Level 2 (in thousands) Cash equivalents: Money market funds $ 4,377 $ 4,377 $ — U.S. government and government agency obligations 300,013 149,964 150,049 Investments: Certificates of deposit 12,138 — 12,138 Corporate notes and obligations 31,770 — 31,770 Municipal obligations 7,681 — 7,681 U.S. government and government agency obligations 36,109 5,297 30,812 $ 392,088 $ 159,638 $ 232,450 Fair Value at Fair Value Measurements Using Inputs Considered as December 31, 2015 Level 1 Level 2 (in thousands) Cash equivalents: Money market funds $ 6,788 $ 6,788 $ — Investments: Certificates of deposit 12,928 — 12,928 Corporate notes and obligations 28,205 — 28,205 Municipal obligations 2,648 — 2,648 U.S. government and government agency obligations 60,667 19,429 41,238 $ 111,236 $ 26,217 $ 85,019
Summary of the maturities of the Company's investments	The following table summarizes the maturities of the Company’s investments at September 30, 2016 : Carrying or Fair Value (in thousands) Remainder of 2016 $ 11,058 2017 38,705 2018 27,542 2019 10,393 Thereafter — Total $ 87,698

Balance Sheet Components (Table

Balance Sheet Components (Tables)	9 Months Ended
	Sep. 30, 2016
Property, Plant and Equipment [Table Text Block]	Property and equipment, net, consisted of the following: September 30, December 31, 2016 2015 (in thousands) Computer equipment and software (1) $ 94,197 $ 55,928 Furniture and fixtures 6,837 5,292 Leasehold improvements 18,532 14,405 Property and equipment 119,566 75,625 Accumulated depreciation and amortization (1) (43,018 ) (28,552 ) Net property and equipment 76,548 47,073 Internal-use software and other assets not placed in service 36,073 34,287 $ 112,621 $ 81,360 ________________ (1) Includes computer equipment and software under capital leases Computer equipment and software under capital leases, net, consisted of the following: September 30, December 31, 2016 2015 (in thousands) Computer equipment $ 8,715 $ 8,715 Software 1,516 1,517 Accumulated amortization (5,760 ) (3,371 ) Net computer equipment and software under capital leases $ 4,471 $ 6,861
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]	Accrued and other current liabilities consisted of the following: September 30, December 31, 2016 2015 (in thousands) Accrued payroll and related expenses $ 21,713 $ 23,938 Accrued commissions 1,151 1,993 Accrued professional fees 257 223 Accrued royalties 1,779 1,546 Sales and other taxes 2,212 1,536 Current portion of leases payable 1,460 3,845 Other accrued expenses 1,534 4,226 $ 30,106 $ 37,307

Goodwill and Other Intangible20

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Other intangible assets, net	intangible assets, net, consisted of the following: September 30, 2016 Gross Carrying Accumulated Net Intangibles Weighted Average Remaining Useful Life (in thousands) (in years) Assets subject to amortization: Developed technology $ 11,535 $ (7,850 ) $ 3,685 3.0 Trade names 331 (329 ) 2 0.1 Customer relationships 19,400 (9,041 ) 10,359 4.2 Order backlog 370 (87 ) 283 3.1 Total assets subject to amortization: 31,636 (17,307 ) 14,329 3.8 Assets not subject to amortization: Trade name 4,039 — 4,039 $ 35,675 $ (17,307 ) $ 18,368 December 31, 2015 Gross Carrying Accumulated Net Intangibles Weighted Average Remaining Useful Life (in thousands) (in years) Assets subject to amortization: Developed technology $ 11,535 $ (5,668 ) $ 5,867 3.1 Trade names 331 (307 ) 24 0.8 Customer relationships 19,400 (6,875 ) 12,525 4.8 Order backlog 370 (15 ) 355 3.8 Total assets subject to amortization: 31,636 (12,865 ) 18,771 4.2 Assets not subject to amortization: Trade name 4,039 — 4,039 $ 35,675 $ (12,865 ) $ 22,810
Minimum future amortization expense for intangible assets	Minimum future amortization expense for intangible assets at September 30, 2016 was as follows: Amortization (in thousands) Remainder of 2016 $ 1,079 2017 4,294 2018 3,443 2019 3,166 2020 1,778 2021 314 Thereafter 255 $ 14,329

Commitments and Contingencies F

Commitments and Contingencies Future minimum lease payments (Tables)	9 Months Ended
	Sep. 30, 2016
us-gaap_CommitmentsAndContingenciesDisclosureAbstract [Abstract]
Schedule of Future Minimum Rental Payments for Operating and Capital Leases [Table Text Block]	Future minimum lease payments under noncancelable operating and capital leases at September 30, 2016 consisted of the following: Capital Leases Operating Leases (in thousands) 2016 $ 897 $ 1,275 2017 618 6,174 2018 87 10,127 2019 — 10,687 2020 — 10,840 2021 — 10,976 Thereafter — 45,446 Total minimum lease payments 1,602 $ 95,525 Less amount representing interest (25 ) Present value of minimum lease payments 1,577 Less current portion (1,460 ) Long-term portion of lease obligations $ 117

Stock Incentive Plans (Tables)

Stock Incentive Plans (Tables)	9 Months Ended
	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation expense	Total stock-based compensation expense recognized consisted of: Three Months ended September 30, Nine Months ended September 30, 2016 2015 2016 2015 (in thousands) Cost of revenues $ 1,381 $ 761 $ 3,483 $ 2,189 Sales and marketing 1,243 783 3,180 1,973 Research and development 1,969 1,438 5,417 3,961 General and administrative 4,155 3,538 11,376 9,481 $ 8,748 $ 6,520 $ 23,456 $ 17,604
Summary of Company's stock option activities	The following table summarizes the Company’s stock option activity under the 2009 Plan and 2011 Plan : Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (in years) (in thousands) Outstanding at January 1, 2016 2,515,329 $ 24.40 7.14 $ 90,818 Granted 14,506 59.78 Exercised (467,268 ) 18.27 Forfeited or expired (57,591 ) 37.84 Outstanding at September 30, 2016 2,004,976 $ 25.70 6.53 $ 159,591 Ending vested and expected to vest at September 30, 2016 1,978,586 $ 25.48 6.51 $ 157,922 Exercisable at September 30, 2016 1,425,363 $ 20.54 5.98 $ 120,810 There were no stock options granted during the three months ended September 30, 2016 . Stock options granted during the nine months ended September 30, 2016 were made under the 2011 Plan. There were no grants under the 2009 Plan during the nine months ended September 30, 2016 .
Stock options activity, additional information	Following is additional information pertaining to the Company’s stock option activity: Three Months ended September 30, Nine Months ended September 30, 2016 2015 2016 2015 (in thousands, except per option amounts) Weighted average fair value per option granted $ — $ 34.39 $ 27.57 $ 26.13 Grant-date fair value of options vested $ 1,787 $ 1,678 $ 7,079 $ 6,026 Intrinsic value of options exercised $ 9,058 $ 10,227 $ 30,302 $ 33,343 Proceeds received from options exercised $ 2,280 $ 1,807 $ 8,535 $ 8,665
Summary of RSU activities	The following table summarizes the Company’s RSU , Performance Award and performance-vesting RSU activity: RSUs Performance Awards and Performance-Vesting RSUs Number of Shares Weighted Average Grant Date Fair Value Per Share Number of Shares Weighted Average Grant Date Fair Value Per Share Outstanding at January 1, 2016 748,688 $ 45.52 508,282 $ 34.68 Granted 535,527 77.59 138,330 59.78 Released (201,272 ) 41.17 (236,219 ) 28.87 Forfeited or expired (75,141 ) 56.56 — — Outstanding at September 30, 2016 1,007,802 $ 62.61 410,393 $ 46.48 Ending vested and expected to vest at September 30, 2016 891,284 410,393
Schedule of Stock Options and Employee Stock Purchase Plan Valuation Assumptions	The fair value of stock options and stock purchase rights granted under the 2009 Plan, the 2011 Plan , and the ESPP were estimated at the date of grant using the Black-Scholes option valuation model with the following weighted average assumptions: Three months ended September 30, Nine Months ended September 30, 2016 2015 2016 2015 Stock option plans: Risk-free interest rate — % 1.87 % 1.38 % 1.75 % Expected life of options (in years) 0 6.08 6.08 5.99 Expected dividend yield — % — % — % — % Volatility — % 48 % 47 % 48 % Employee Stock Purchase Plan: Risk-free interest rate 0.46 % 0.24 % 0.36 % 0.19 % Expected life of options (in years) 0.50 0.50 0.50 0.50 Expected dividend yield — % — % — % — % Volatility 33 % 44 % 38 % 39 %
ScheduleOfSharesOfCommonStockAvailableForFutureIssuanceUnderStockOptionPlansTextBlock [Table Text Block]	The following numbers of shares of common stock were reserved and available for future issuance at September 30, 2016 : Reserved Shares Options and awards outstanding under stock option plans 3,423,171 Shares available for future grant under the 2011 Equity Incentive Award Plan 3,896,188 Shares available under the Employee Stock Purchase Plan 1,398,843 Total 8,718,202

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Supplemental disclosure of revenue by service type	Supplemental disclosure of revenues by type is as follows: Three months ended September 30, Nine Months ended September 30, 2016 2015 2016 2015 (in thousands) On-demand revenues (1) $ 100,381 $ 68,019 $ 263,386 $ 185,776 On-premise revenues (1) — 920 718 3,294 $ 100,381 $ 68,939 $ 264,104 $ 189,070

Net Income (Loss) Per Share o24

Net Income (Loss) Per Share of Common Stock (Details Table) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Components of net income (loss) per share
Net income	$ 13,780	$ 6,222	$ 26,874	$ 17,436
Basic shares:
Weighted average common shares outstanding	31,916,910	29,363,621	30,407,020	29,076,820
Diluted shares:
Weighted average common shares outstanding	31,916,910	29,363,621	30,407,020	29,076,820
Effect of potentially dilutive securities:
Weighted Average Number Diluted Shares Outstanding Adjustment	1,565,623	1,642,030	1,632,063	1,696,533
Weighted average shares used to compute diluted net income per share	33,482,533	31,005,651	32,039,083	30,773,353
Net income (loss) per share:
Basic	$ 0.43	$ 0.21	$ 0.88	$ 0.60
Diluted	$ 0.41	$ 0.20	$ 0.84	$ 0.57

Net Income (Loss) Per Share o25

Net Income (Loss) Per Share of Common Stock (Details Table 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 13,780	$ 6,222	$ 26,874	$ 17,436
Employee Stock Options and Awards [Member]
Antidilutive securities excluded from computation of earning per share
Anti-dilutive securities excluded from computation of earnings per share amount	0	306,377	42,036	230,106

Net Income (Loss) Per Share o26

Net Income (Loss) Per Share of Common Stock (Details Textual) - shares	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Performance-Based Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share amount	167,336	214,014

Financial Instruments and Fai27

Financial Instruments and Fair Value Measurements (Fair Value Hierarchy) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers, Net	$ 0	$ 0	$ 0	$ 0
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	392,088		392,088		$ 111,236
Level 1 [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	159,638		159,638		26,217
Level 2 [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	232,450		232,450		85,019
Money market funds [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	4,377		4,377		6,788
Money market funds [Member] | Level 1 [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	4,377		4,377		6,788
Money market funds [Member] | Level 2 [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	0		0		0
Certificates of Deposit [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	12,138		12,138		12,928
Certificates of Deposit [Member] | Level 1 [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	0		0		0
Certificates of Deposit [Member] | Level 2 [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	12,138		12,138		12,928
Corporate Debt Securities [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	31,770		31,770		28,205
Corporate Debt Securities [Member] | Level 1 [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	0		0		0
Corporate Debt Securities [Member] | Level 2 [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	31,770		31,770		28,205
Municipal Bonds [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	7,681		7,681		2,648
Municipal Bonds [Member] | Level 1 [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	0		0		0
Municipal Bonds [Member] | Level 2 [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	7,681		7,681		2,648
US Treasury and Government [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	36,109		36,109		60,667
US Treasury and Government [Member] | Level 1 [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	5,297		5,297		19,429
US Treasury and Government [Member] | Level 2 [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	30,812		30,812		$ 41,238
US Treasury and Government [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	300,013		300,013
US Treasury and Government [Member] | Level 1 [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	149,964		149,964
US Treasury and Government [Member] | Level 2 [Member]
Fair value hierarchy of Company's financial assets on recurring basis
Assets, Fair Value	$ 150,049		$ 150,049

Financial Instruments and Fai28

Financial Instruments and Fair Value Measurements (Carrying Amounts and Fair Value) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers, Net	$ 0	$ 0	$ 0	$ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	81,172		81,172		$ 81,647
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	55		55		260
Cash and Cash Equivalents, at Carrying Value	344,539	$ 52,417	344,539	$ 52,417	34,396	$ 26,756
Available-for-sale Securities, Amortized Cost Basis	87,647		87,647		104,705
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax	106		106		17
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax	(55)		(55)		(274)
Cash and Cash Equivalents, Fair Value Disclosure	344,525		344,525
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	385		385		4,307
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0		0		14
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	81,557		81,557		85,954
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	55		55		274
Available-for-sale Securities	87,698		87,698		104,448
US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	62,114		62,114		48,394
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	22		22		139
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	385		385		1,793
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0		0		3
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	62,499		62,499		50,187
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	22		22		142
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,200		2,200		9,284
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4		4		22
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0		0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0		0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,200		2,200		9,284
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	4		4		22
Corporate Note Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	16,858		16,858		23,969
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	29		29		99
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0		0		2,514
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0		0		11
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	16,858		16,858		26,483
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	29		29		110
Fair Value, Measurements, Recurring [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash	40,149		40,149		27,608
Money market funds	4,377		4,377		6,788
Fair Value, Measurements, Recurring [Member] | Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax	14		14
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax	0		0
Fair Value, Measurements, Recurring [Member] | Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax	14		14
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax	0		0
Fair Value, Measurements, Recurring [Member] | Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	7,689		7,689		2,647
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax	2		2		1
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax	(10)		(10)		0
Available-for-sale Securities	7,681		7,681		2,648
Fair Value, Measurements, Recurring [Member] | US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	36,086		36,086		60,799
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax	35		35		10
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax	(12)		(12)		(142)
Available-for-sale Securities	36,109		36,109		60,667
Fair Value, Measurements, Recurring [Member] | Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	12,097		12,097		12,945
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax	45		45		5
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax	(4)		(4)		(22)
Available-for-sale Securities	12,138		12,138		12,928
Fair Value, Measurements, Recurring [Member] | Corporate Note Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	31,775		31,775		28,314
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax	24		24		1
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax	(29)		(29)		(110)
Available-for-sale Securities	31,770		31,770		$ 28,205
US Treasury and Government [Member] | Fair Value, Measurements, Recurring [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash Equivalents, at Carrying Value	299,999		299,999
Cash and Cash Equivalents, Fair Value Disclosure	$ 300,013		$ 300,013

Financial Instruments and Fai29

Financial Instruments and Fair Value Measurements (Summary of Investment Maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	$ 348,100
Available For Sale Securities Debt Maturities after One Through Three Years Fair Value	44,000
Maturities of the Company's investments
Available-for-sale Securities, Debt Maturities, Remainder of Fiscal Year, Fair Value	11,058
Available For Sale Securities, Debt Maturities, Next Fiscal Year, Fair Value	38,705
Available For Sale Securities, Debt Maturities, In Two Years, Fair Value	27,542
Available For Sale Securities, Debt Maturities, In Three Years, Fair Value	10,393
Available For Sale Securities, Debt Maturities, Thereafter, Fair Value	0
Total	$ 87,698	$ 104,448

Financial Instruments and Fai30

Financial Instruments and Fair Value Measurements Investment income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net Investment Income [Line Items]
Interest and Dividend Income, Securities, Operating	$ 220	$ 181	$ 632	$ 512

Balance Sheet Components Proper

Balance Sheet Components Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 119,566		$ 119,566		$ 75,625
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	43,018		43,018		28,552
Depreciable Property, Plant Equipment	76,548		76,548		47,073
Internal-use Software and Other Assets Not Placed in Service	36,073		36,073		34,287
Property, Plant and Equipment, Net	112,621		112,621		81,360
Depreciation, Depletion and Amortization, Nonproduction	5,808	$ 3,014	14,487	$ 7,324
Capital Leases, Income Statement, Amortization Expense	800	$ 700	2,400	$ 1,600
Capital Leases, Balance Sheet, Assets by Major Class, Net	4,471		4,471		6,861
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Capital Leased Assets, Gross	8,715		8,715		8,715
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	6,837		6,837		5,292
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	18,532		18,532		14,405
Computer Software, Intangible Asset [Member]
Property, Plant and Equipment [Line Items]
Capital Leased Assets, Gross	1,516		1,516		1,517
Computer Equipment And Computer Software [Member]
Property, Plant and Equipment [Line Items]
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	5,760		5,760		3,371
Property, Plant and Equipment, Gross	$ 94,197		$ 94,197		$ 55,928

Balance Sheet Components Accrue

Balance Sheet Components Accrued and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Accrued and Other Current Liabilities [Line Items]
Employee-related Liabilities, Current	$ 21,713	$ 23,938
Accrued Sales Commission, Current	1,151	1,993
Accrued Professional Fees, Current	257	223
Accrued Royalties, Current	1,779	1,546
Sales and Excise Tax Payable, Current	2,212	1,536
Capital Lease Obligations, Current	1,460	3,845
Other Accrued Liabilities, Current	1,534	4,226
Accrued and other current liabilities	$ 30,106	$ 37,307

Goodwill and Other Intangible33

Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill	$ 74,547,000	$ 74,547,000	$ 74,547,000
Goodwill, Transfers	$ 0	$ 0

Goodwill and Other Intangible34

Goodwill and Other Intangible Assets (Intangible Assets Gross and Net Balances) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Other Intangible Net
Gross Carrying Amount	$ 31,636	$ 31,636
Accumulated Amortization	(17,307)	(12,865)
Finite-Lived Intangible Assets, Net	14,329	18,771
Net Intangibles	$ 18,368	$ 22,810
Finite-Lived Intangible Assets, Remaining Amortization Period	46 months 2 days	50 months 29 days
Intangible Assets, Gross (Excluding Goodwill)	$ 35,675	$ 35,675
Developed technology [Member]
Other Intangible Net
Gross Carrying Amount	11,535	11,535
Accumulated Amortization	(7,850)	(5,668)
Net Intangibles	$ 3,685	$ 5,867
Finite-Lived Intangible Assets, Remaining Amortization Period	35 months 15 days	36 months 24 days
Customer Relationships and Contracts [Member]
Other Intangible Net
Gross Carrying Amount	$ 19,400	$ 19,400
Accumulated Amortization	(9,041)	(6,875)
Net Intangibles	$ 10,359	$ 12,525
Finite-Lived Intangible Assets, Remaining Amortization Period	50 months 2 days	57 months 26 days
Trade Names [Member]
Other Intangible Net
Gross Carrying Amount	$ 331	$ 331
Accumulated Amortization	(329)	(307)
Net Intangibles	$ 2	$ 24
Finite-Lived Intangible Assets, Remaining Amortization Period	1 month	10 months
Order or Production Backlog [Member]
Other Intangible Net
Gross Carrying Amount	$ 370	$ 370
Accumulated Amortization	(87)	(15)
Net Intangibles	$ 283	$ 355
Finite-Lived Intangible Assets, Remaining Amortization Period	37 months	46 months
Trade Names [Member]
Other Intangible Net
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 4,039	$ 4,039

Goodwill and Other Intangible35

Goodwill and Other Intangible Assets (Intangible Assets Future Amortization) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Minimum future amortization expense for intangible assets
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	$ 1,079
Finite-Lived Intangible Assets, Amortization Expense, Next Fiscal Year	4,294
Finite-Lived Intangible Assets, Amortization Expense, in Two Years	3,443
Finite-Lived Intangible Assets, Amortization Expense, in Three Years	3,166
Finite-Lived Intangible Assets, Amortization Expense, in Four Years	1,778
Finite-Lived Intangible Assets, Amortization Expense, in Five Years	314
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	255
Finite-Lived Intangible Assets, Net	$ 14,329	$ 18,771

Goodwill and Other Intangible36

Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 1,500	$ 1,200	$ 4,442	$ 3,689

Income Taxes (Details Textual)

Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Annual Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent			36.50%	40.60%
Annual Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effective tax rate	35.20%	36.30%	35.80%	40.70%
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense			$ 0	$ 0
Federal statutory tax rate	35.00%		35.00%
Excess Tax Benefit from Share-based Compensation, Financing Activities	$ 4,200,000	$ 0	$ 5,472,000	$ 3,828,000

Commitments and Contingencies (

Commitments and Contingencies (Details Textual1)	Sep. 30, 2016USD ($)Facilities	Jun. 30, 2016USD ($)
Operating Leased Assets [Line Items]
Property Subject to or Available for Operating Lease, Number of Units | Facilities	8
Operating Leases, Future Minimum Payments Due	$ 95,525,000
Office Space - Irvine, CA | Minimum [Member]
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due		$ 12,800
Office Space - Irvine, CA | Maximum [Member]
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due		15,000
Office Space - HQ Building 3 Amendment [Member] | Minimum [Member]
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due		201,600
Office Space - HQ Building 3 Amendment [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due		$ 527,300
Office Space - Omaha, NE | Minimum [Member]
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due	25,600
Office Space - Omaha, NE | Maximum [Member]
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due	$ 37,900

Commitments and Contingencies39

Commitments and Contingencies Future minimum lease payments table (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Capital Leases, Future Minimum Payments, Remainder of Fiscal Year	$ 897
Operating Leases, Future Minimum Payments Receivable, Remainder of Fiscal Year	1,275
Capital Leases, Future Minimum Payments Due, Next Twelve Months	618
Operating Leases, Future Minimum Payments Due, Next Twelve Months	6,174
Capital Leases, Future Minimum Payments Due in Two Years	87
Operating Leases, Future Minimum Payments, Due in Two Years	10,127
Capital Leases, Future Minimum Payments Due in Four Years	0
Operating Leases, Future Minimum Payments, Due in Three Years	10,687
Capital Leases, Future Minimum Payments Due in Four Years	0
Operating Leases, Future Minimum Payments, Due in Four Years	10,840
Capital Leases, Future Minimum Payments Due in Five Years	0
Operating Leases, Future Minimum Payments, Due in Five Years	10,976
Capital Leases, Future Minimum Payments Due Thereafter	0
Operating Leases, Future Minimum Payments, Due Thereafter	45,446
Capital Leases, Future Minimum Payments Due	1,602
Operating Leases, Future Minimum Payments Due	95,525
Capital Leases, Future Minimum Payments, Interest Included in Payments	(25)
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments	1,577
Capital Lease Obligations, Current	(1,460)	$ (3,845)
Capital Lease Obligations, Noncurrent	$ 117	$ 685

Stock Incentive Plans (Details

Stock Incentive Plans (Details Table 3) (Stock-based compensation allocation) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 29, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Stock-based compensation expense
Stock-based compensation by financial statement line item		$ 8,748	$ 6,520	$ 23,456	$ 17,604
Cost of Sales [Member]
Stock-based compensation expense
Stock-based compensation by financial statement line item		1,381	761	3,483	2,189
Selling and Marketing Expense [Member]
Stock-based compensation expense
Stock-based compensation by financial statement line item		1,243	783	3,180	1,973
Research and Development Expense [Member]
Stock-based compensation expense
Stock-based compensation by financial statement line item		1,969	1,438	5,417	3,961
General and Administrative Expense [Member]
Stock-based compensation expense
Stock-based compensation by financial statement line item		$ 4,155	$ 3,538	$ 11,376	$ 9,481
Sig Anderman [Member] | Performance-vesting RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	6,692

Stock Incentive Plans (Detail41

Stock Incentive Plans (Details Table) (Stock Option Activity) - Stock Option [Member] - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at January 1, 2016	2,515,329
Granted	14,506
Exercised	(467,268)
Forfeited or expired	(57,591)
Outstanding at September 30, 2016	2,004,976	2,515,329
Ending vested and expected to vest at September 30, 2016	1,978,586
Exercisable at September 30, 2016	1,425,363
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding at Beg of Period, weighted average exercise price, Beginning Balance	$ 24.40
Options granted, weighted average exercise price	59.78
Options exercised, weighted average exercise price	18.27
Options forfeited or expired, weighted average exercise price	37.84
Outstanding at End of Period, weighted average exercise price, Ending Balance	25.70	$ 24.40
Ending vested and expected to vest, Weighted Average Exercise Price at End of Period	25.48
Stock option exercisable at End of Period, weighted average exercise price, Ending Balance	$ 20.54
Weighted average remaining contractual term at End of Period	6 years 194 days
Ending vested and expected to vest, Weighted Average Remaining Contractual Term at End of Period	6 years 186 days
Stock option exercisable, weighted average remaining Contractual term, Ending balance	5 years 358 days	7 years 51 days
Aggregate Intrinsic value at End of Period	$ 159,591
Ending vested and expected to vest, Aggregate Intrinsic Value at End of Period	157,922
Exercisable aggregate Intrinsic Value	$ 120,810	$ 90,818

Stock Incentive Plans (Detail42

Stock Incentive Plans (Details Table 1) (Stock Option Additional Information) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Stock options activity, additional information
Weighted average fair value per option granted	$ 0	$ 34.39	$ 27.57	$ 26.13
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	$ 1,787	$ 1,678	$ 7,079	$ 6,026
Intrinsic value of options exercised	9,058	10,227	30,302	33,343
Proceeds received from options exercised	$ 2,280	$ 1,807	$ 8,535	$ 8,665

Stock Incentive Plans (Detail43

Stock Incentive Plans (Details Table 2) (RSU and Performance Award activity) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended	9 Months Ended
	Feb. 29, 2016	Oct. 31, 2015	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2015
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				14,506
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number				1,978,586
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested				$ 16.8	$ 9.6
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number				891,284
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding at January 1, 2016			748,688	748,688
Granted				535,527
Released				(201,272)
Forfeited or expired				75,141
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value				$ 56.56
Outstanding at September 30, 2016				1,007,802
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value			$ 45.52	$ 45.52
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value				77.59
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value				41.17
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value				$ 62.61
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value				$ 8.3	3.8
Performance Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested				$ 21.6	13.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number				410,393
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding at January 1, 2016			508,282	508,282
Granted				138,330
Released				(236,219)
Forfeited or expired				0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value				$ 0
Outstanding at September 30, 2016				410,393
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value			$ 34.68	$ 34.68
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value				59.78
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value				28.87
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value				$ 46.48
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value				$ 6.8	$ 4.5
Former CEO of Mortgage Returns [Member] | Performance-vesting RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Performance Shares granted		29,006
Performance shares value		$ 2
Sig Anderman [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	14,506
Sig Anderman [Member] | Performance-vesting RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Performance Shares granted	6,692
Sig Anderman [Member] | Upon Issuance [Domain] | December 2014 Performance-vesting RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Estimated Performance Share Conversion Rate				1.41
Other grantees [Member] | Performance-vesting RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Performance Shares granted	64,449
Other grantees [Member] | Upon Issuance [Domain] | December 2014 Performance-vesting RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Estimated Performance Share Conversion Rate				2
Maximum [Member] | Sig Anderman [Member] | Performance-vesting RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares of Common Stock Issuable Per Award			2
Maximum [Member] | Other grantees [Member] | Performance-vesting RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares of Common Stock Issuable Per Award			2
Minimum [Member] | Sig Anderman [Member] | Performance-vesting RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares of Common Stock Issuable Per Award			0
Minimum [Member] | Other grantees [Member] | Performance-vesting RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares of Common Stock Issuable Per Award			0

Stock Incentive Plans (Detail44

Stock Incentive Plans (Details Table 4) (Fair Value Assumptions)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Stock Option [Member]
Schedule of Stock Options and Employee Stock Purchase Plan Valuation Assumptions
Risk-free interest rate	0.00%	1.87%	1.38%	1.75%
Expected Life of options (in years)	0 years	6 years 29 days	6 years 29 days	5 years 361 days
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Volatility	0.00%	48.00%	47.00%	48.00%
Employee Stock Purchase Plan [Member]
Schedule of Stock Options and Employee Stock Purchase Plan Valuation Assumptions
Risk-free interest rate	0.46%	0.24%	0.36%	0.19%
Expected Life of options (in years)	183 days	6 months	183 days	182 days
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Volatility	33.00%	44.00%	38.00%	39.00%

Stock Incentive Plans (Detail45

Stock Incentive Plans (Details Table 5) (Reserved Shares)	Sep. 30, 2016shares
Class of Stock [Line Items]
Reserved Shares	8,718,202
Options and Awards Outstanding [Member]
Class of Stock [Line Items]
Reserved Shares	3,423,171
Shares Available for Future Grant [Member]
Class of Stock [Line Items]
Reserved Shares	3,896,188
Shares Available Under Employee Stock Purchase Plan [Member]
Class of Stock [Line Items]
Reserved Shares	1,398,843

Stock Incentive Plans (Detail46

Stock Incentive Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Feb. 29, 2016	May 01, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation capitalized to property and equipment	$ 1,927	$ 705
Stock Repurchase Program, Authorized Amount				$ 75,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 43,500
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual Automatic Increase in Shares Reserved for Issuance, Shares			295,665
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	14,506
Share Price	$ 105.30
Unrecognized Compensation Cost Related to unvested Stock option	$ 9,900
Expected to be recognized over a weighted average period	1 year 325 days
Annual Automatic Increase in Shares Reserved for Issuance, Shares			1,478,325
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 16,800	9,600
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 8,300	3,800
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	201,272
Performance Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 21,600	13,200
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 6,800	$ 4,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	236,219
Restricted Stock Units and Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost Related to unvested Stock option	$ 56,200
Expected to be recognized over a weighted average period	2 years 205 days
2009 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0
Employee Stock Purchase Plan [Member] | Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares purchased under ESPP	101,816	110,598
Purchase price of ESPP shares	$ 6,700	$ 4,100
Unrecognized compensation cost related to employee stock purchase plan	$ 1,000
Expected recognized period under employee stock purchase plan	5 months
Upon Issuance [Domain] | Performance Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
First Anniversary [Member] | Performance Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%

Stock Incentive Plans Follow-on

Stock Incentive Plans Follow-on offering (Details) $ in Millions	3 Months Ended
	Sep. 30, 2016USD ($)shares
Equity [Abstract]
Stock Issued During Period, Shares, New Issues | shares	3,162,500
Stock Issued During Period, Value, New Issues	$ 271.4
Payments of Stock Issuance Costs	$ 13.2

Segment Information (Details Ta

Segment Information (Details Table) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information Revenue
Revenues	$ 100,381	$ 68,939	$ 264,104	$ 189,070
On Demand Revenues [Member]
Segment Reporting Information Revenue
Revenues	100,381	68,019	263,386	185,776
On Premise Revenues [Member]
Segment Reporting Information Revenue
Revenues	$ 0	$ 920	$ 718	$ 3,294