Leases (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) lease item	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Leases
Option to renew operating leases	false
Operating lease costs	$ 16,694	$ 13,496	$ 10,666
Number of off-campus classroom and laboratory sites | item	4
Weighted-average remaining lease term	7 years 7 months 13 days
Weighted-average discount rate of operating leases	4.22%
Operating lease payments	$ 14,895	$ 11,391	$ 9,537
Number of financing leases | lease	0
Operating lease commitments not yet commenced
Leases
Non-cancelable operating lease commitments not yet commenced	$ 17,029
Minimum
Leases
Term of operating leases	1 month
Maximum
Leases
Term of operating leases	10 years 4 months