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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
 9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Accounting Policies [Line Items]    
Lease liability $ 1,154,000  
Deferred rent obligation 120,000  
Cash and cash equivalents 12,967,000 $ 17,504,000
Tax on other comprehensive income (loss) 0  
Reclassifications out of other comprehensive income (loss) 0  
Right-of-use lease asset $ 1,213,000  
Lease, practical expedients package true  
ASU 2016-02 [Member]    
Accounting Policies [Line Items]    
Lease liability $ 1,500,000