Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax benefit	$ 15,248	$ 22,413	$ 49,535
Effective income tax rate	(18.90%)	(40.70%)	(153.50%)
Effective income tax rate reconciliation, at federal statutory income tax rate, percent	21.00%	21.00%	35.00%
Net provisional income tax benefit associated with TCJA	$ (4,197)	$ 3,897	$ (31,063)
Net operating loss carryforwards	19,599	13,347
Research and development credit carryforwards	13,133	7,567
Deferred tax assets valuation allowance	883	1,673
Deferred tax assets considered realizable	69,738	41,409
Deferred tax assets, more likely than not to be utilized		23,400
Unrecognized tax benefits	19,933	18,819	$ 17,013	$ 23,574
Unrecognized tax benefits that would impact effective tax rate favorably	19,400
Income tax penalties and interest expense	(100)	300
Income tax penalties and interest accrued	$ 200	$ 500