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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)
 12 Months Ended
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