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Revenue - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Trailing fee liability (at fair value)	$ 1,775		$ 1,276
Servicing fees and other receivables	18,134		11,656
Accrued interest income	$ 700		$ 900
Customers | Total Revenue
Disaggregation of Revenue [Line Items]
Concentration risk (in percent)		79.00%
Customer One | Customers | Total Revenue
Disaggregation of Revenue [Line Items]
Concentration risk (in percent)	60.00%
Customer One | Customers | Accounts Receivable
Disaggregation of Revenue [Line Items]
Concentration risk (in percent)	39.00%		34.00%
Customer Two | Customers | Total Revenue
Disaggregation of Revenue [Line Items]
Concentration risk (in percent)	25.00%
Customer Two | Customers | Accounts Receivable
Disaggregation of Revenue [Line Items]
Concentration risk (in percent)	21.00%		15.00%
Platform and referral fees, net
Disaggregation of Revenue [Line Items]
Loan premium and loan trailing fees recognized	$ 3,600	$ 2,400
Trailing fee liability (at fair value)	1,800		$ 1,300
Servicing fees and other receivables	$ 11,700		$ 8,100
Capitalized cost amortization term	3 years

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