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Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash and Cash Equivalents [Abstract]        
Cash $ 5,858 $ 12,329    
Cash equivalents [1] 6,059 5,849    
Cash and cash equivalents $ 11,917 $ 18,178 $ 17,890 $ 12,997
Weighted average interest rate of cash on deposit 0.30% 0.11%    
[1] Comprised mainly of deposits in banks as at December 31, 2015 and 2016 carrying a weighted average interest rate of 0.11% and 0.10%, respectively.