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Share-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 547 $ 147  
Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 934    
Expected weighted-average period in years of compensation cost to be recognized 2 years 3 months    
Total fair value of shares vested $ 372 82  
Weighted average estimated fair value of shares granted $ 3.24   $ 2.41
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 427    
Expected weighted-average period in years of compensation cost to be recognized 8 months 19 days    
Research and Development [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 124 41  
General and Administrative [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 423 $ 106