Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Payables and Accruals [Abstract]
Accrued research and development expenses	$ 32,310	$ 18,531
Accrued employee expenses	11,246	9,250
Accrued general and administrative expenses	662	1,480
Lease liability	2,162	1,453
Income taxes payable	384	971
Accrued legal expenses	1,256	669
Total accrued expenses	48,020	32,354
Less long-term portion	2,620	0
Total accrued expenses, current	$ 45,400	$ 32,354