Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Net operating loss carryforwards	$ 56,442	$ 38,562
Tax credits	40,637	41,193
Stock-based compensation	6,911	6,326
Deferred revenue	35,357	34,897
Lease liability	7,846
Accruals and reserves	830	3,659
Gross deferred tax assets	148,023	124,637
Valuation allowance	(138,534)	(119,451)
Total deferred tax assets	9,489	5,186
Deferred tax liabilities:
Tangible assets	(3,226)	(3,728)
Intangible assets	(4,877)	(7,562)
Right-of-use assets	(4,913)
Total deferred tax liabilities	(13,016)	(11,290)
Net deferred tax liabilities	$ (3,527)	$ (6,104)