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Revenue Recognition - Narrative (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) course term | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Graduation Fund [Line Items] |  |  |
Number of free courses | course | 1 |  |
Number of successfully completed courses | course | 3 |  |
Consecutive terms of non attendance in which graduation fund credits will be lost | term | 1 |  |
Expected collection period of tuition receivable | 12 months |  |
Graduation fund estimated to be redeemed | $ 18,100 |  |
Graduation fund liability | 44,480 | $ 46,842 | $ 52,024
Undergraduate Degree Programs |  |  |
Graduation Fund [Line Items] |  |  |
Graduation fund liability | 40,600 | 41,700 |
Tuition Cap |  |  |
Graduation Fund [Line Items] |  |  |
Contract liability | $ 11,800 | $ 4,700 |
Minimum |  |  |
Graduation Fund [Line Items] |  |  |
Expected collection period of tuition receivable, noncurrent | 2 years |  |
Deferred acquisition costs, amortization period | 1 year |  |
Maximum |  |  |
Graduation Fund [Line Items] |  |  |
Expected collection period of tuition receivable, noncurrent | 4 years |  |
Deferred acquisition costs, amortization period | 2 years |  |

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