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Significant Accounting Policies (Schedule of Deferred Revenue in Consolidated Balance Sheets) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Significant Accounting Policies [Abstract]  
Beginning of year $ 1,037
Deferral of revenue 1,764
Recognition of deferred revenue (977)
Balance at end of year $ 1,824