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Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]        
Cash and cash equivalents $ 1,410 $ 1,533    
Restricted bank deposits 332 247    
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows $ 1,742 $ 1,780 $ 1,482 $ 1,614