Leases (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) lease item	Sep. 30, 2022 USD ($)
Leases
Lessee, Operating Lease, Existence of Option to Extend [true false]			false
Operating lease costs	$ 3,525	$ 2,789	$ 9,695	$ 7,596
Non-cancelable operating lease commitments not yet commenced	24,077		$ 24,077
Number of off-campus classroom and laboratory sites | item			4
Optical fiber communication lines not yet commenced	$ 192		$ 192
Weighted-average remaining lease term	7 years 11 months 26 days		7 years 11 months 26 days
Weighted-average discount rate of operating leases	3.78%		3.78%
Number of financing leases | lease			0
Minimum
Leases
Term of operating leases	8 months		8 months
Maximum
Leases
Term of operating leases	10 years 8 months		10 years 8 months