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Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash and Cash Equivalents [Abstract]        
Cash $ 12,329 $ 14,172    
Cash equivalents [1] 5,849 3,718    
Cash and cash equivalents $ 18,178 $ 17,890 $ 12,997 $ 13,306
Weighted average interest rate of cash on deposit 0.11% 0.14%    
[1] Comprised mainly of deposits in banks as at December 31, 2014 and 2015 carrying a weighted average interest rate of 0.14% and 0.11%, respectively.