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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

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