LEASES - Components of Lease Cost and Other Operating Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Lease, Cost [Abstract]
Operating lease cost	$ 2,132	$ 2,505
Short-term lease cost	11	34
Variable lease cost	405	528
Operating cash flows used in operating leases	(2,261)	(2,018)
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 41	$ 7,961
Weighted-average remaining lease term - operating leases	5 years 10 months 29 days	7 years 3 months 7 days
Weighted-average discount rate - operating leases	8.00%	8.00%