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Stock-based Compensation - Total Stock-based Compensation Recognized (Details) - Options, TRSUs, PSUs and the ESPP - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Stock-based compensation expense:    
Stock-based compensation expense $ 13,125 $ 13,167
Research and Development Expense [Member]    
Stock-based compensation expense:    
Stock-based compensation expense 5,544 5,797
General and Administrative Expense [Member]    
Stock-based compensation expense:    
Stock-based compensation expense $ 7,581 $ 7,370