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Share-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 295 $ 245 $ 861 $ 793
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost $ 734   $ 734  
Expected weighted-average period in years of compensation cost to be recognized     1 year 9 months 29 days  
Total fair value of shares vested     $ 515 $ 378
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 $ 188   $ 188  
Expected weighted-average period in years of compensation cost to be recognized     7 months 28 days  
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost 172   $ 172  
Expected weighted-average period in years of compensation cost to be recognized     6 months  
Research and development        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 56 $ 50 $ 181 $ 174
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 239 $ 195 $ 680 $ 619