Balance Sheet Components - Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Other Assets [Abstract]
Accrued expenses	$ 30,598	$ 48,207
Accrued payroll	19,168	37,293
Loan servicing liabilities (at fair value)	4,810	8,780
Trailing fee liability (at fair value)	5,201	4,315
Accrued expenses and other liabilities	13,870	4,823
Total accrued expenses and other liabilities	$ 73,647	$ 103,418