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Debt Obligations - Senior Term Loan (Details) - USD ($) |  | 9 Months Ended |
--- | --- | --- | ---
Dec. 07, 2018 | Sep. 30, 2021 | Dec. 31, 2020
Senior Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from issuance of debt | $ 70,000,000 |  |
Less: net unamortized debt discount | 2,100,000 |  |
Debt issuance costs | $ 2,000,000 |  |
Interest rate, stated percentage | 4.75% |  |
Prepayment fees associated with the early pay-off |  | $ 0 |
Senior Term Loan | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 1.50% |  |
Senior Term Loan due December 2021, related party | Senior Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Less: net unamortized debt discount |  | 0 | $ 480,000
Debt issuance costs |  | $ 0 | $ 465,000
Senior Term Loan due December 2021, related party | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Percent of common stock owned | 5.00% |  |

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