Annual report pursuant to Section 13 and 15(d) 12-31-2018

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
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Beginning balance $ (1,357) $ (3,665)
Issuances of warrants classified as derivatives (7,577) (810)
Change in fair value 7,005 3,118
Exercise of warrants 575  
Other, net (212)  
Ending balance $ (1,566) $ (1,357)