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Share-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 229 $ 254 $ 1,090 $ 1,047
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost $ 530   $ 530  
Expected weighted-average period in years of compensation cost to be recognized     1 year 8 months 8 days  
Total fair value of shares vested     $ 535 $ 398
Weighted average estimated fair value of shares granted (in dollars per share) $ 2.12 $ 3.18 $ 2.12 $ 3.18
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost $ 221   $ 221  
Expected weighted-average period in years of compensation cost to be recognized     1 year 8 months 1 day  
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost 76   $ 76  
Expected weighted-average period in years of compensation cost to be recognized     3 months  
Research and development        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 58 $ 54 $ 240 $ 229
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 171 $ 200 $ 850 $ 818