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Summary of Significant Accounting Policies (Narrative) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Apr. 14, 2020
shares
Apr. 13, 2020
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2020
shares
Dec. 31, 2020
USD ($)
$ / shares
Accounting Policies [Line Items]          
Right-of-use lease asset     $ 1,181   $ 1,227
Cash and cash equivalents     47,777   33,406
Lease liability     996   1,057
Reverse stock split ratio 0.05        
Reverse stock split, Number of fractional shares cancelled | shares 14        
Reverse stock split, fractional shares issued | shares 0        
Tax on other comprehensive income (loss)     0    
Reclassifications out of other comprehensive income (loss)     $ 0   $ 0
Common stock, par value (in dollars per share) | $ / shares     $ 0.001   $ 0.001
Weighted-average number of common shares used in loss per share – basic and diluted (in shares) | shares 859,998 17,199,974 7,099,037 859,998