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REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Capitalized Contract Cost [Line Items] |  |  |  |  |
Deferred revenue | $ 3.9 |  | $ 3.9 |  | $ 11.2
Amortization of deferred contract costs | 2.6 | $ 3.6 | 7.8 | $ 12.3 |
Variable consideration from unredeemed vouchers sold in prior periods | 19.1 |  | 31.8 |  |
Prepaid Expenses and Other Current Assets |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Deferred cloud implementation cost | $ 7.9 |  | $ 7.9 |  | $ 6.3
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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