Revenue - Narrative (Details) - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Disaggregation of Revenue [Line Items]
Contract assets	$ 0	$ 0
Deferred revenue	24,967,000	23,474,000
Courses in Progress
Disaggregation of Revenue [Line Items]
Future revenue	15,600,000	14,100,000
Future Courses
Disaggregation of Revenue [Line Items]
Future revenue	$ 9,400,000	$ 9,400,000