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REVENUE - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Revenue recognized | $ 116,002,000 | $ 92,806,000 | $ 74,775,000
Impairment losses on contract assets | 0 | 0 | $ 0
Impairment losses on deferred partner fees | 2,008,000 |  |
Russian Educator Partners |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impairment losses on deferred partner fees |  | $ 2,915,000 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01 |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Remaining performance obligation | $ 320,936,000 |  |
Percent of remaining performance obligations to be recognized | 68.00% |  |
Period for satisfaction of remaining performance obligation | 12 months |  |

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