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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Stock-Based Compensation        
Share-based compensation $ 209 $ 54 $ 539 $ 193
Research and development        
Stock-Based Compensation        
Share-based compensation   60 18 115
General and administrative        
Stock-Based Compensation        
Share-based compensation $ 209 $ (6) $ 521 $ 78