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SEGMENT INFORMATION - Schedule of Contribution Profit by Segment (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]        
Revenue   $ 967,108,000 $ 1,416,868,000 $ 2,218,915,000
Cost of revenue   229,992,000 739,574,000 1,032,786,000
Marketing   188,780,000 154,534,000 339,355,000
Contribution profit   548,336,000 522,760,000 846,774,000
Selling, general and administrative   511,096,000 603,185,000 806,945,000
Goodwill impairment $ 0 0 109,486,000 0
Long-lived asset impairment   0 22,351,000 0
Restructuring and related charges   41,895,000 64,836,000 31,000
Income (loss) from operations   (4,655,000) (277,098,000) 39,798,000
North America        
Segment Reporting Information [Line Items]        
Revenue   607,055,000 818,624,000 1,358,907,000
Cost of revenue   71,392,000 342,993,000 551,162,000
Marketing   138,025,000 96,039,000 214,069,000
Contribution profit   397,638,000 379,592,000 593,676,000
International        
Segment Reporting Information [Line Items]        
Revenue   360,053,000 598,244,000 860,008,000
Cost of revenue   158,600,000 396,581,000 481,624,000
Marketing   50,755,000 58,495,000 125,286,000
Contribution profit   $ 150,698,000 $ 143,168,000 $ 253,098,000