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Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash and Cash Equivalents [Abstract]        
Cash $ 12,834 $ 5,858    
Cash equivalents [1] 4,187 6,059    
Cash and cash equivalents $ 17,021 $ 11,917 $ 18,178 $ 17,890
Weighted average interest rate of cash on deposit 0.07% 0.30%    
[1] Comprised mainly of deposits in banks as at December 31, 2016 and 2017 carrying a weighted average interest rate of 0.30% and 0.07%, respectively.