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Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Revenue        
Revenue $ 57 $ 57 $ 113 $ 113
Activity in deferred revenue        
Balance at the beginning of the period     226  
Balance at the end of the period 226   226  
SymBio        
Activity in deferred revenue        
Balance at the beginning of the period     3,243  
Deferred revenue recognized     (113)  
Balance at the end of the period 3,130   3,130  
License and collaboration agreements. | SymBio        
Revenue        
Revenue $ 57 $ 57 $ 113 $ 113