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Fair Value of Financial Instruments - Activity of Fair Value Derivative Liability (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Derivative Liability, Fair Value, Gross Liability [Roll Forward]      
Balance at beginning of period $ 2,420    
Change in fair value of derivative liability, recorded as other income (600) $ 286 $ 0
Balance at end of period $ 1,820 $ 2,420