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Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation [Line Items]    
Share-based compensation expense $ 2,005 $ 1,265
Research and development    
Share-based Compensation [Line Items]    
Share-based compensation expense 760 179
General and administrative    
Share-based Compensation [Line Items]    
Share-based compensation expense $ 1,245 $ 1,086