Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets:
Net operating loss carryforwards	$ 357,440	$ 346,356
Research and development tax credits	69,300	56,675
Capitalized research and experimental expenditures	65,211	84,572
Accruals and reserves	18,795	19,494
Convertible debt transactions	12,574	1,189
Investment in partnerships	11,363	0
Stock-based compensation	10,622	12,249
Operating lease liabilities	5,456	14,564
Amortization	322	612
Other	288	402
Total deferred tax assets	551,371	536,113
Less: valuation allowance	(531,883)	(508,966)
Deferred tax assets – net of valuation allowance	19,488	27,147
Deferred tax liabilities:
Servicing rights	9,436	7,607
Right of use asset	4,234	12,587
Interest receivables	2,821	2,481
Intangible assets	2,135	2,728
Depreciation	784	1,183
Investment in partnerships	0	242
Other	78	319
Total deferred tax liabilities	19,488	27,147
Net deferred tax assets	$ 0	$ 0