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Derivative Warrant Liabilities - Schedule of Outstanding Warrants Liabilities (Details) (10-K) (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Nov. 28, 2016
Dec. 31, 2017
Jun. 30, 2018
Dec. 31, 2016
Reverse stock split one-to-nine Reverse Stock Split      
Estimated fair value of warrant liability   $ 28 $ 14 $ 313
September 4, 2018 [Member]        
Reverse stock split   one-for-15 reverse stock split