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PROPERTY AND EQUIPMENT - Schedule of Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 123,840 $ 109,712
Less accumulated depreciation and amortization (96,798) (84,932)
Property and equipment, net $ 27,042 24,780
Minimum    
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  
Equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 76,423 67,415
Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 2 years  
Equipment | Maximum    
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  
Property and equipment, gross $ 24,707 21,977
Software | Minimum    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 2 years  
Software | Maximum    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 5 years  
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,490 1,892
Furniture and fixtures | Minimum    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 3 years  
Furniture and fixtures | Maximum    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 5 years  
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 5 years  
Property and equipment, gross $ 21,220 $ 18,428
Leasehold improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 1 year  
Leasehold improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 5 years