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
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Beginning balance $ (1,566) $ (1,357)
Issuances of warrants classified as derivatives   (7,577)
Change in fair value 754 6,500
Exercise of warrants 44 575
Other, net (1) (212)
Ending balance $ (769) $ (2,071)