Income Taxes - Components of Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss carryforwards	$ 70,855	$ 28,692
Tax credit carryforwards	8,338	4,980
Accrued liabilities & allowances	3,879	3,518
Deferred revenue	8,224	8,997
Amortization	15,961	14,375
Investment basis difference	13,587	3,334
Lease liability	18,429	13,421
Stock-based compensation	2,872	5,175
Other	2,613	1,454
Gross deferred tax assets	144,758	83,946
Valuation allowance	(127,226)	(71,093)
Deferred tax assets, net of valuation allowance	17,532	12,853
Deferred tax liabilities:
Operating lease right-of-use assets	(12,647)	(11,221)
Property and equipment	(4,885)	(1,632)
Deferred tax liabilities	(17,532)	(12,853)
Net deferred tax assets	$ 0	$ 0