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Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2018 | Sep. 30, 2024 USD ($) item | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) segment item | Sep. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Summary Of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |
Investments |  | $ 0 |  | $ 0 |  |  |  | $ 98,031 |  |  |
Other assets |  | $ 1,636 |  | $ 1,636 |  |  |  | 1,641 |  |  |
Number of operating segments | segment |  |  |  | 1 |  |  |  |  |  |  |
Number of reporting units | segment |  |  |  | 1 |  |  |  |  |  |  |
Number of university partners | item |  | 22 |  | 22 |  |  |  |  |  |  |
Goodwill |  | $ 160,766 |  | $ 160,766 |  |  |  | 160,766 |  |  |
Unbilled revenue |  | 8,351 |  | 8,351 |  |  |  | 188 |  |  |
Amounts written off |  |  |  | 0 |  |  |  |  |  |  |
Allowance for doubtful accounts |  | 0 |  | 0 |  |  |  |  |  |  |
Stockholders equity |  | 764,137 | $ 650,530 | 764,137 | $ 650,530 | $ 759,195 | $ 759,447 | 718,014 | $ 645,425 | $ 659,250 | $ 637,619
Income tax expense |  | 10,862 | $ 8,537 | 43,008 | $ 34,636 |  |  |  |  |  |
Cash in excess of FDIC insured limits |  | $ 262,584 |  | $ 262,584 |  |  |  | 145,474 |  |  |
Revenue Benchmark | Customer Concentration Risk | Grand Canyon University |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 88.30% | 87.00% |  |  |  |  |  |
Computer Software |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |
Estimated average useful life |  | 3 years |  | 3 years |  |  |  |  |  |  |
Capitalized Content Development |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |
Estimated average useful life |  | 4 years |  | 4 years |  |  |  |  |  |  |
Other assets |  | $ 676 |  | $ 676 |  |  |  | $ 746 |  |  |
University partner relationships |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |
Estimated average useful life |  | 25 years |  | 25 years |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |
Initial contract terms of service agreements |  |  |  | 7 years |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |
Initial contract terms of service agreements |  |  |  | 15 years |  |  |  |  |  |  |
Master Services Agreement | Grand Canyon University |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |
Percentage of tuition and fee revenue used for closing of purchase agreement | 60.00% |  |  |  |  |  |  |  |  |  |

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