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Summary of Significant Accounting Policies (Narrative) (Details)
 3 Months Ended
Apr. 24, 2020
USD ($)
Apr. 24, 2020
USD ($)
Apr. 14, 2020
$ / shares
shares
Apr. 13, 2020
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
shares
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
Accounting Policies [Line Items]                
Right-of-use lease asset         $ 1,151,000     $ 1,264,000
Deferred rent obligation             $ 120,000  
Cash and cash equivalents         8,923,000     11,885,000
Lease liability         $ 1,073,000   $ 1,500,000 $ 1,191,000
Common stock, par value (in dollars per share) | $ / shares         $ 0.001     $ 0.001
Weighted average common shares outstanding (in shares) | shares         859,998 681,910    
Tax on other comprehensive income (loss)         $ 0      
Reclassifications out of other comprehensive income (loss)         $ 0 $ 0    
Lease, practical expedients package         true      
Subsequent Events [Member]                
Accounting Policies [Line Items]                
Net proceeds from equity financing $ 18,400,000 $ 18,400,000            
Stockholders' equity, reverse stock split     On April 14, 2020, the Company filed a certificate of amendment to its amended and restated certificate of incorporation with the Secretary of State of the State of Delaware to effect a 1-for-20 reverse stock split of the Company's shares of common stock.          
Reverse stock split ratio     0.05          
Common stock, par value (in dollars per share) | $ / shares     $ 0.001          
Weighted average common shares outstanding (in shares) | shares     859,998 17,199,974        
Reverse stock split, Number of fractional shares cancelled | shares     14          
Reverse stock split, fractional shares issued | shares     0