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Derivative Warrant Liabilities - Schedule of Outstanding Warrants Liabilities (Details) (Parenthetical) - USD ($)
$ in Thousands
Sep. 04, 2018
Sep. 30, 2018
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Reverse stock split 1:15 reverse stock split    
Estimated fair value of warrant liability   $ 5 $ 28