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Share-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 245 $ 1,968 $ 793 $ 2,115
Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost $ 850   $ 850  
Expected weighted-average period in years of compensation cost to be recognized     2 years 15 days  
Total fair value of shares vested     $ 378 $ 85
Weighted average estimated fair value of shares granted $ 3.18 $ 2.41 $ 3.18 $ 2.41
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost $ 0   $ 0  
Expected weighted-average period in years of compensation cost to be recognized     0 years  
Research and Development [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 50 $ 341 $ 174 $ 381
General and Administrative [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 195 $ 1,627 $ 619 $ 1,734