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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2019 | Nov. 30, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Amortization period for deferred contract costs |  |  | 5 years |  |  |
Goodwill impairment | $ 0 | $ 0 |  | $ 0 |  |
More-likely-than-not benefit likelihood percentage being realized upon ultimate settlement with taxing authority resulting from sustainability of tax examination |  |  | 50.00% |  |  |
Advertising costs |  |  | $ 6,700,000 | $ 6,900,000 | $ 6,100,000 |
Right of use assets |  |  | 58,273,000 |  |  | $ 41,800,000
Total short and long-term lease liabilities |  |  | $ 68,495,000 |  |  | $ 54,200,000
Computer Equipment |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property and equipment estimated useful lives |  |  | 3 years |  |  |
Furniture and Fixtures |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property and equipment estimated useful lives |  |  | 5 years |  |  |
Minimum | Internal Use Software |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Useful life of capitalized software |  |  | 3 years |  |  |
Maximum | Internal Use Software |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Useful life of capitalized software |  |  | 5 years |  |  |

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