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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Other Commitments [Line Items] |  |
Loss contingency reserve | $ 0 |
Purchase Commitment - Three Year Cloud Computing |  |
Other Commitments [Line Items] |  |
Commercial commitments due in the next twelve months | $ 5,600,000 |
Term of commercial commitment (in years) | 3 years |
Purchase obligations | $ 15,600,000 |
Payments of commercial commitments | 3,200,000 | $ 5,600,000
Prepaid asset | 4,200,000 | $ 4,300,000
Purchase Commitments - Advertising |  |
Other Commitments [Line Items] |  |
Commercial commitments due in the next twelve months | $ 7,300,000 |

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