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Restricted cash (Tables)
 12 Months Ended
Dec. 31, 2023
Other Assets, Noncurrent [Abstract]  
Schedule of collateralized bank account of financial institution Total restricted cash as of December 31, 2023 and 2022 consisted of the following (in thousands):
As of December 31,
20232022
50 Binney Street lease$40,072 $40,072 
Assembly Row lease2,753 2,753 
Embedded lease
7,632 — 
Other2,385 2,614 
Total restricted cash$52,842 $45,439