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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |
Maximum measurement period from the acquisition date within which company records adjustments to the assets acquired and liabilities assumed |  | 1 year |  |  |
Goodwill impairment | $ 164,300,000.0 | $ 164,300,000 | $ 0 | $ 0 |
Advertising expense |  | $ 500,000 | 500,000 | $ 300,000 |
Number of reportable operating segments | segment |  | 1 |  |  |
Operating lease assets | 36,654,000 | $ 36,654,000 | $ 0 |  |
Additional lease liabilities | $ 44,921,000 | $ 44,921,000 |  |  |
Leasehold improvements |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment, useful life |  | 5 years |  |  |
Software |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment, useful life |  | 3 years |  |  |
Minimum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment, useful life |  | 2 years |  |  |
Minimum | Leasehold improvements |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment, useful life |  | 1 year |  |  |
Minimum | Software |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment, useful life |  | 2 years |  |  |
Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment, useful life |  | 5 years |  |  |
Maximum | Leasehold improvements |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment, useful life |  | 5 years |  |  |
Maximum | Software |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment, useful life |  | 5 years |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Operating lease assets |  |  |  |  | $ 43,900,000
Additional lease liabilities |  |  |  |  | $ 47,800,000

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