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REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Capitalized Contract Cost [Line Items] |  |  |  |  |
Deferred contract acquisition costs | $ 6.9 |  | $ 6.9 |  | $ 8.0
Amortization of deferred contract costs | 2.7 | $ 2.6 | 5.6 | $ 5.2 |
Variable consideration from unredeemed vouchers sold in prior periods | $ 4.3 | $ 10.2 | $ 3.0 | $ 13.0 |
Minimum |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Deferred contract acquisition cost recognition period | 12 months |  | 12 months |  |
Maximum |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Deferred contract acquisition cost recognition period | 18 months |  | 18 months |  |

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