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