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PROPERTY AND EQUIPMENT - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross |  | $ 123,840
Property and equipment, gross | $ 135,934 |
Less accumulated depreciation and amortization | (106,958) |
Less accumulated depreciation and amortization |  | (96,798)
Property and equipment, net | 28,976 |
Property and equipment, net | $ 28,976 | 27,042
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 | $ 82,737 | 76,423
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 | $ 27,939 | 24,707
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 | $ 1,283 | 1,490
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
Property and equipment, gross | $ 23,975 |
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 |

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