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Summary of Significant Accounting Policies (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2023
USD ($)
segment
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Summary of Significant Accounting Policies      
Allowance for doubtful accounts on grants receivable $ 0    
Grant income 3,426 $ 5,904  
Deferred grant income, current 1,646   $ 1,702
Deferred grant income, noncurrent 1,764   1,686
Unrecognized income tax $ 0   $ 0
Expected dividend yield 0.00% 0.00%  
Number of operating segments | segment 1