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Summary of Significant Accounting Policies (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
segment
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Summary of Significant Accounting Policies          
Allowance for doubtful accounts on grants receivable $ 0   $ 0    
Grant income 6,925 $ 6,385 10,351 $ 12,289  
Deferred grant income, current 1,056   1,056   $ 1,702
Deferred grant income, noncurrent 1,052   1,052   1,686
Unrecognized income tax $ 0   $ 0   $ 0
Expected dividend yield     0.00% 0.00%  
Number of operating segments | segment     1