Fair Value Measurement - Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets
Loans	$ 252,477	$ 78,460
Notes receivable and residual certificates	8,288	19,074
Loan servicing assets	18,388	6,831
Total assets	279,153	104,365
Liabilities
Loan servicing liabilities	8,780	8,254
Trailing fee liabilities	4,315	1,276
Total liabilities	13,095	9,530
Fair Value, Inputs, Level 1
Assets
Loans	0	0
Notes receivable and residual certificates	0	0
Loan servicing assets	0	0
Total assets	0	0
Liabilities
Loan servicing liabilities	0	0
Trailing fee liabilities	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 2
Assets
Loans	0	0
Notes receivable and residual certificates	0	0
Loan servicing assets	0	0
Total assets	0	0
Liabilities
Loan servicing liabilities	0	0
Trailing fee liabilities	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 3
Assets
Loans	252,477	78,460
Notes receivable and residual certificates	8,288	19,074
Loan servicing assets	18,388	6,831
Total assets	279,153	104,365
Liabilities
Loan servicing liabilities	8,780	8,254
Trailing fee liabilities	4,315	1,276
Total liabilities	$ 13,095	$ 9,530