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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