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PROPERTY, EQUIPMENT AND SOFTWARE - Narrative and Schedule of Property, Equipment, and Software (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Property, Plant and Equipment [Line Items]          
Property, equipment and software, gross $ 50,742   $ 50,742   $ 44,157
Less accumulated depreciation (29,710)   (29,710)   (26,675)
Property, equipment, and software, net 21,032   21,032   17,482
Depreciation expense 1,600 $ 1,200 3,000 $ 2,300  
Furniture and fixtures          
Property, Plant and Equipment [Line Items]          
Property, equipment and software, gross 2,329   $ 2,329   2,254
Furniture and fixtures | Minimum          
Property, Plant and Equipment [Line Items]          
Useful Life     2 years    
Furniture and fixtures | Maximum          
Property, Plant and Equipment [Line Items]          
Useful Life     7 years    
Equipment          
Property, Plant and Equipment [Line Items]          
Property, equipment and software, gross 10,169   $ 10,169   8,164
Equipment | Minimum          
Property, Plant and Equipment [Line Items]          
Useful Life     3 years    
Equipment | Maximum          
Property, Plant and Equipment [Line Items]          
Useful Life     7 years    
Computer software          
Property, Plant and Equipment [Line Items]          
Property, equipment and software, gross 32,251   $ 32,251   27,804
Computer software | Minimum          
Property, Plant and Equipment [Line Items]          
Useful Life     3 years    
Computer software | Maximum          
Property, Plant and Equipment [Line Items]          
Useful Life     5 years    
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property, equipment and software, gross $ 5,993   $ 5,993   $ 5,935
Leasehold improvements | Minimum          
Property, Plant and Equipment [Line Items]          
Useful Life     5 years    
Leasehold improvements | Maximum          
Property, Plant and Equipment [Line Items]          
Useful Life     10 years