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Share-Based Compensation - Schedule of Stock-Based Compensation Expense (Details) - USD ($)
$ 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]        
Total share- based compensation expense $ 266 $ 1,091 $ 609 $ 1,550
Research and Development [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share- based compensation expense 49 18 96 67
General and Administrative [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share- based compensation expense $ 217 $ 1,073 $ 513 $ 1,483