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Shareholders' Deficit - Schedule of Share-based Compensation Expense (Details) - Stock Options - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Total share-based compensation expense $ 389 $ 121 $ 660 $ 186
Research and Development        
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Total share-based compensation expense 163 63 296 103
General and Administrative        
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Total share-based compensation expense $ 226 $ 58 $ 364 $ 83