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Description of Business and Summary of Significant Accounting Policies - Other income (expense), net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Description of Business and Summary of Significant Accounting Policies    
Loss on remeasurement of debt $ (895) $ (6,159)
Loss on remeasurement of warrants (2,584) (2,090)
Gain on settlement of accounts payable 796 735
Gain (loss) on extinguishment of debt, net 5,748 (483)
Other, net   30
Other, net (274)  
Other income (expense), net $ 2,791 $ (7,967)