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Income Taxes - Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Tax benefit at federal statutory rate	$ (43,747)	$ (15,664)	$ (17,102)
State taxes, net of federal benefit	(4,431)	21	10
Research and other credits	(2,305)	(1,245)	(1,643)
VA release related to Title365 PPA	(34,462)	0	0
Change in valuation allowance	38,188	16,431	16,388
Section 162(m) adjustment	10,241	0	0
Non-deductible transaction costs	1,252	0	0
Stock-based compensation	(2,828)	572	1,739
Other	(794)	(89)	621
Income tax benefit (expense)	$ (38,886)	$ 26	$ 13

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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