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Derivative Warrant Liabilities - Schedule of Valuation of Derivative Warrant Liabilities (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Balances beginning [1] $ 28 $ 313  
Exercised [1]  
Expiration [1],[2]    
Changes in fair value (14) [1] (285) [1] $ (262)
Balances at ending [1] 14 28 313
Series A (2011) [Member]      
Balances beginning [1]  
Exercised [1]  
Expiration [1]    
Changes in fair value [1]  
Balances at ending [1]
Series A (2013) [Member]      
Balances beginning [1] 12  
Exercised [1]  
Expiration [1]    
Changes in fair value [1] (12)  
Balances at ending [1] 12
Series A (2013) [Member]      
Balances beginning [1] 9  
Exercised [1]  
Expiration [1]    
Changes in fair value [1] (9)  
Balances at ending [1] 9
Series A (2015) [Member]      
Balances beginning [1] 22  
Exercised [1]  
Expiration [1]    
Changes in fair value [1] (22)  
Balances at ending [1] 22
Series A (2016) [Member]      
Balances beginning [1] [2] 43  
Exercised [1]  
Expiration [1]    
Changes in fair value [1] [2] (43)  
Balances at ending [1] [2] 43
Series B (2016) [Member]      
Balances beginning [1] 28 227  
Exercised [1]  
Expiration [1]    
Changes in fair value [1] (14) (199)  
Balances at ending [1] $ 14 $ 28 $ 227
[1] Share data represents the number of shares adjusted to retroactively reflect the 1:15 Reverse Split effected on September 4, 2018.
[2] Less than 1