Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Fair Value Measurement Hierarchy of Derivative Liability (Details)

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Fair Value Measurements - Schedule of Fair Value Measurement Hierarchy of Derivative Liability (Details) - Common Stock Warrants [Member] - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Beginning balance $ (220) $ (1,566)
Issuance of derivatives (6,328)  
Change in fair value 2,037 610
Exercise of warrants 3,008  
Ending balance $ (1,503) $ (956)