Accounts Payable and Accrued Expenses  | 
3 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2025  | ||||||||||||||||||||||||||||||||||||||||||||||
| Payables and Accruals [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||
| Accounts Payable and Accrued Expenses | 
 4. Accounts Payable and Accrued Expenses 
 Accounts payable and accrued expenses consisted of the following (in thousands) as of: 
 
 
 
 Accounts payable and accrued expenses contain unpaid general and administrative expenses and costs related to research and development that have been billed and estimated unbilled, respectively, as of period-end. 
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