Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Net operating loss carryforwards	$ 82,201	$ 67,451
Accruals and reserves	16,841	9,549
Stock-based compensation	59,872	45,843
Fixed assets	12,122	6,906
Deferred revenue	43,411	23,095
Research and development credits	23,445	14,959
Other deferred tax assets	1,017	802
Gross deferred tax assets	238,909	168,605
Valuation allowance	(81,937)	(54,872)
Total deferred tax assets	156,972	113,733
Deferred tax liabilities:
Acquisition related intangibles	(81,621)	(112,928)
Other deferred tax liabilities	(92)	(326)
Deferred Tax Liabilities, Financing Arrangements	(73,427)	0
Total deferred tax liabilities	(155,140)	(113,254)
Total net deferred tax assets	$ 1,832	$ 479