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Borrowings - Summary (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Schedule of Borrowings [Line Items]    
Total payments due $ 41,928 $ 62,681
Unamortized debt discount (37) (55)
Total borrowings 41,891 62,626
Term loans    
Schedule of Borrowings [Line Items]    
Total payments due 15,000 15,000
UNI credit facility | Revolving credit facility    
Schedule of Borrowings [Line Items]    
Total payments due 5,500 5,500
Warehouse credit facilities | Revolving credit facility    
Schedule of Borrowings [Line Items]    
Total payments due 16,323 34,994
Risk retention funding loans    
Schedule of Borrowings [Line Items]    
Total payments due $ 5,105 $ 7,187