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SIGNIFICANT ACCOUNTING POLICIES - Additional information (Details) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 segment | Oct. 31, 2018 segment | Dec. 31, 2017 USD ($) | Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2019 USD ($) | Jan. 01, 2018 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |
Number of reportable segments | segment | 1 | 1 |  | 3 |  |  |  |
Advertising expense |  |  |  | $ 567,700 | $ 688,200 | $ 469,900 |  |
Change in accounting estimate |  |  |  |  |  |  |  | $ 1,000
Provisional estimate for remeasurement of deferred tax assets and liabilities from Tax Cuts and Jobs Act |  |  | $ 9,100 |  |  | $ 9,100 |  |
Liabilities |  |  |  | 824,229 | 545,643 |  |  |
Assets |  |  |  | $ 1,188,990 | $ 947,969 |  |  |
Cumulative effect adjustment | ASU 2016-02 |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  | $ 8,800 |
Assets |  |  |  |  |  |  | $ 8,800 |
Minimum |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |
Hosting arrangement, amortization period |  |  |  | 1 year |  |  |  |
Minimum | Software development |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |
Depreciation period |  |  |  | 1 year |  |  |  |
Maximum |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |
Hosting arrangement, amortization period |  |  |  | 5 years |  |  |  |
Maximum | Software development |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |
Depreciation period |  |  |  | 5 years |  |  |  |

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