Income Taxes - Schedule of Company's Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Components Of Deferred Tax Assets And Liabilities [Abstract]
Deferred revenue		$ 1,005
Net operating loss carryforward	$ 8,257	9,100
Stock-based compensation	35,482	26,000
Tax credits	8,076	12,098
Intangible assets	9,833	5,259
Accruals and reserves	19,156	15,247
Total deferred tax assets	80,804	68,709
Less: valuation allowance	(16,827)	(16,023)
Total net deferred tax assets	63,977	52,686
Depreciation	(3,168)	(2,741)
Convertible Notes		(12,792)
Contingent consideration	(3,798)
Total deferred tax liabilities	(6,966)	(15,533)
Net deferred tax assets	57,011	37,153
Net current deferred tax assets		21,987
Net non-current deferred tax assets	$ 57,011	15,176
Net non-current deferred tax liabilities (included in “Other non-current liabilities”)		$ (10)