Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating losses	$ 308,997	$ 237,010
Stock-based compensation	24,181	20,672
Capitalized expenses	10,499	12,590
License fees	8,716	8,159
Operating lease liabilities	7,972	4,251
Legal fees	2,366	2,136
Tax credits	1,580	1,580
Deferred Revenue	12,133	0
Other	7,048	5,360
Total deferred tax assets	383,492	291,758
Valuation allowance	(376,071)	(287,349)
Total deferred tax assets	7,421	4,409
Deferred tax liabilities:
Operating lease assets	(7,421)	(3,541)
Other	0	(868)
Total deferred tax liabilities	(7,421)	(4,409)
Net deferred tax assets (liabilities)	$ 0	$ 0