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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 01, 2021
USD ($)
Mar. 31, 2021
USD ($)
third_party_processor
customer
Mar. 31, 2020
USD ($)
customer
Dec. 31, 2020
USD ($)
third_party_processor
Dec. 31, 2019
USD ($)
Concentration Risk [Line Items]          
Advertising costs   $ 85,900 $ 36,200    
Selling and marketing expenses not directly related to a revenue generating transaction   183,600 106,800    
Impact of accounting standards update adoption   2,314,373 1,807,945 $ 2,681,569 $ 1,715,050
Retained Earnings          
Concentration Risk [Line Items]          
Impact of accounting standards update adoption   (155,241) (616,219) (297,223) (510,328)
Additional paid-in          
Concentration Risk [Line Items]          
Impact of accounting standards update adoption   $ 2,459,415 $ 2,427,596 2,955,464 $ 2,223,749
Cumulative Effect, Period of Adoption, Adjustment          
Concentration Risk [Line Items]          
Impact of accounting standards update adoption       (399,734)  
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings          
Concentration Risk [Line Items]          
Impact of accounting standards update adoption       102,974  
Cumulative Effect, Period of Adoption, Adjustment | Additional paid-in          
Concentration Risk [Line Items]          
Impact of accounting standards update adoption       $ (502,708)  
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Convertible Debt          
Concentration Risk [Line Items]          
Debt instrument increase $ 399,700        
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Retained Earnings          
Concentration Risk [Line Items]          
Impact of accounting standards update adoption 103,000        
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Additional paid-in          
Concentration Risk [Line Items]          
Impact of accounting standards update adoption $ (502,700)        
Minimum          
Concentration Risk [Line Items]          
Settlements receivable period   1 day      
Maximum          
Concentration Risk [Line Items]          
Settlements receivable period   2 days      
Revenue Benchmark | Customer Concentration Risk          
Concentration Risk [Line Items]          
Number of customers accounting for greater than 10% of total net revenue | customer   0 0    
Settlements Receivable | Credit Concentration Risk          
Concentration Risk [Line Items]          
Number of third party processors | third_party_processor   2   2  
Settlements Receivable | Credit Concentration Risk | Third Party Processor One          
Concentration Risk [Line Items]          
Concentration risk   53.00%   59.00%  
Settlements Receivable | Credit Concentration Risk | Third Party Processor Two          
Concentration Risk [Line Items]          
Concentration risk   33.00%   27.00%