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STOCKHOLDERS' EQUITY - Effects of Share-Based Compensation on Statements of Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based compensation expense $ 165,011 $ 110,389 $ 429,999 $ 283,872
Cost of revenue        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based compensation expense 99 100 310 271
Product development        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based compensation expense 121,209 78,682 314,265 205,647
Sales and marketing        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based compensation expense 16,023 12,063 40,680 27,354
General and administrative        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based compensation expense $ 27,680 $ 19,544 $ 74,744 $ 50,600