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LEASES - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
ft²
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]      
Additional amortization expense $ 70 $ 0  
Variable lease costs 637 $ 601 $ 900
Facilities      
Lessee, Lease, Description [Line Items]      
Accrual for future anticipated variable lease costs 900   900
2019 Restructuring Initiative      
Lessee, Lease, Description [Line Items]      
Accrual for future anticipated variable lease costs 2,465   3,101
2019 Restructuring Initiative | Facilities      
Lessee, Lease, Description [Line Items]      
Additional amortization expense 100   3,700
Accrual for future anticipated variable lease costs $ 953   $ 991
North Dallas, Texas      
Lessee, Lease, Description [Line Items]      
Square feet under lease | ft² 107,800