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
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Beginning balance $ (220) $ (1,566)
Issuance of derivatives (6,328)  
Change in fair value 4,166 (21)
Exercise of warrants 1,556  
Other, net   (1)
Ending balance $ (826) $ (1,588)