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Derivative Liability - Changes in Fair Value (Details) - Exit fee derivative liability - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Change in Fair Value of Derivative Liability      
Fair value of exit fee derivative liability, beginning $ 1,376 $ 969 $ 533
Change in estimated fair value of derivative liability (678) 407 436
Fair value of exit fee derivative liability, ending $ 698 $ 1,376 $ 969