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Summary of Significant Accounting Policies (Schedule of Effects on Company's Consolidated Balance Sheet) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Operating leases right-of-use $ 3,615
Operating lease liabilities $ (3,539)  
According to the previous accounting policy [Member]    
Operating leases right-of-use  
Prepaid expenses   90
Operating lease liabilities  
The change [Member]    
Operating leases right-of-use   3,424
Prepaid expenses   (90)
Operating lease liabilities   (3,334)
As presented according to Topic 842 [Member]    
Operating leases right-of-use   3,424
Prepaid expenses  
Operating lease liabilities   $ (3,334)