Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Net operating loss carryforwards	$ 304,879	$ 297,851
Operating lease liabilities	29,052	29,870
Research and development credits	38,796	29,046
Capitalized research and experimental expenditures	28,732	0
Convertible debt transactions	10,734	15,184
Stock-based compensation	13,714	9,895
Accruals and reserves	2,948	6,908
Investment in partnerships	801	1,020
Amortization	90	111
Other	631	573
Total deferred tax assets	430,377	390,458
Less: valuation allowance	(387,976)	(351,542)
Deferred tax assets – net of valuation allowance	42,401	38,916
Deferred tax liabilities:
Right of use asset	24,887	28,606
Servicing rights	9,368	2,859
Intangible assets	4,502	5,911
Depreciation	3,644	2,123
Total deferred tax liabilities	42,401	39,499
Net deferred tax liabilities	$ 0	$ (583)