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Share-Based Compensation - Schedule of Share-based Compensation Expense (Details) - Stock Options - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Total share-based compensation expense $ 2,057 $ 271
Research and Development    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Total share-based compensation expense 987 133
General and Administrative    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Total share-based compensation expense $ 1,070 $ 138