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Fair Value of Financial Instruments - Reconciliation of Fair Value of Equity Warrants (Details) - Equity warrants - Level 3 - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 1,911 $ 5,162 $ 1,914 $ 5,162
Change in fair value (8) (3) (11) (3)
Sales 0 (3,207) 0 (3,207)
Ending balance $ 1,903 $ 1,952 $ 1,903 $ 1,952