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Derivative Liability - Changes in Fair Value (Details) - Exit Fee derivative liability - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Change in Fair Value of Derivative Liability    
Fair value of Exit Fee derivative liability, beginning $ 1,376 $ 969
Change in estimated fair value of derivative liability (713) 152
Fair value of Exit Fee derivative liability, ending $ 663 $ 1,121