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Net Loss Per Share (Narrative) (Details) - USD ($)
shares in Thousands
3 Months Ended 9 Months Ended
Aug. 05, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Subsidiary, Sale of Stock [Line Items]          
Underwriting costs, commissions and other fees $ 548,000        
Effect of dilutive securities excluded   $ 4,453,000 $ 5,786,000 $ 4,453,000 $ 5,786,000
ATM          
Subsidiary, Sale of Stock [Line Items]          
Stock issued during period, authorized amount $ 150,000,000        
Number of shares sold (in shares) 4,616        
Net proceeds from sale of stock $ 24,965,000        
Availability remaining under ATM $ 124,487,000