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Derivative Warrant Liabilities - Schedule of Liabilities Measured on a Recurring Basis (Details) (10-K) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2016
Jun. 30, 2018
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Beginning balance $ 575 $ 28 $ 313
Revaluation of warrants (262) (14) (285)
Exercise warrants [1]  
Ending balance $ 313 $ 14 $ 28
[1] Less than 1