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, 2018
Jun. 30, 2017
Beginning balance $ (1,357) $ (3,665)
Issuances of warrants classified as derivatives (7,577) (810)
Change in fair value 2,020 2,182
Exercise of warrants 565  
Other, net (212)  
Ending balance $ (6,561) $ (2,293)