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Finance Expenses, Net - Summary of Finance Expenses, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Other Income and Expenses [Abstract]    
Bank fees and interest $ 1 $ 1
Change in fair value of derivative warrant liability (285) (262)
Financing loss on debt extinguishment 2,364
Exchange rate differences 5 (44)
Revaluation and interest on convertible loans 237 333
Financial expenses, net $ 2,322 $ 28