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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2021 USD ($) | Sep. 30, 2021 USD ($) customer | Sep. 30, 2020 USD ($) customer | Sep. 30, 2021 USD ($) third_party_processor customer | Sep. 30, 2020 USD ($) customer | Dec. 31, 2020 USD ($) third_party_processor
Concentration Risk [Line Items] |  |  |  |  |  |
Advertising costs |  | $ 123,100 | $ 75,700 | $ 296,400 | $ 145,800 |
Selling and marketing expenses not directly related to a revenue generating transaction |  | 183,200 | $ 208,400 | 555,900 | $ 465,100 |
Impact of accounting standards update adoption |  | $ 2,959,825 |  | $ 2,959,825 |  | $ 2,681,569
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 (Accumulated deficit) |  |  |  |  |  |
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 capital |  |  |  |  |  |
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 | 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 |  |  |  | 50.00% |  | 59.00%
Settlements Receivable | Credit Concentration Risk | Third Party Processor Two |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Concentration risk |  |  |  | 34.00% |  | 27.00%

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