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Fair Value Measurements - Fair Value Measurements Using Significant Unobservable Inputs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value Disclosures [Abstract]    
Beginning balance $ 3,368 $ 33
Total change in the liability included in earnings 2,832 (17,498)
Reclass from liability to equity $ (6,200) (11)
Fair value of warrants issued   20,844
Ending balance   $ 3,368