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Fair Value - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Marketable securities $ 674 $ 695
Redeemable warrants 2,095 962
Level 1 [Member]    
Marketable securities 674 695
Redeemable warrants
Level 2 [Member]    
Marketable securities
Redeemable warrants
Level 3 [Member]    
Marketable securities
Redeemable warrants $ 2,095 $ 962