Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation and Warrants - Estimated fair value of the warrant liability (Details)

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Stock-Based Compensation and Warrants - Estimated fair value of the warrant liability (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value of Financial Instruments    
Beginning Balance   $ 4,083
Change in fair value of warrant liability $ 0 $ (4,083)