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Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash and Cash Equivalents [Abstract]        
Cash $ 19,477 $ 13,382    
Cash equivalents [1] 1,199 3,087    
Cash and cash equivalents $ 20,676 $ 16,469 $ 26,808 $ 17,021
Weighted average interest rate of cash on deposit 0.84% 1.04%    
[1] Comprised mainly of deposits in banks as at December 31, 2019 and 2020 carrying a weighted average interest rate of 1.04% and 0.84%, respectively.