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Derivative Liability - Schedule of Changes in Fair Value (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Derivative Liability    
Fair value of Exit Fee derivative liability at beginning $ 969 $ 533
Change in estimated fair value of derivative liability 290 246
Fair value of Exit Fee derivative liability at ending $ 1,259 $ 779