RESTRUCTURING CHARGES - Schedule of Accrued Restructuring and Severance Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Mar. 31, 2019
Accrued restructuring and severance costs rollforward
Balance at beginning of period		$ 1,578
Balance at end of period	$ 478
Employee compensation costs
Accrued restructuring and severance costs rollforward
Balance at beginning of period	820	1,578
Cash paid	(342)	(758)
Balance at end of period	$ 478	$ 820