Income Taxes - Schedule of Deferred Tax and Related Valuation Allowance (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Accrued bonus	$ 24,093	$ 19,950
Deferred revenue	4,188	6,460
Deferred rent	11,245	8,000
Stock-based compensation	20,345	20,557
NOLs	15,743	26,698
Unrealized losses	1,039	1,239
Tax credit carryforwards	70,235	49,135
License income	2,245	6,611
Other	16,483	11,909
Deferred tax assets	165,616	150,559
Depreciation and amortization	(23,912)	(13,933)
Acquired intangible assets	(45,773)	(48,781)
Deferred commissions	(14,232)	(14,750)
Internal-use software development costs capitalized	(63,586)	(54,687)
Deferred tax liabilities	(147,503)	(132,151)
Valuation allowance	(2,824)	0
Net deferred tax assets	$ 15,289	$ 18,408