RESTRUCTURING CHARGES - Schedule of Accrued Restructuring and Severance Costs (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Accrued restructuring and severance costs rollforward
Balance at beginning of period	$ 3,763
Balance at end of period	1,332
Employee compensation costs
Accrued restructuring and severance costs rollforward
Balance at beginning of period	3,763
Cash paid	(2,431)
Balance at end of period	$ 1,332