REVENUE FROM CONTRACTS WITH CUSTOMERS - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended
	Jun. 28, 2019	Mar. 31, 2020
Contract Balance And Performance Obligations description		The Company had no contract assets and contract liability balances under the license and collaboration agreements at either March 31, 2020 or 2019.
AD Pharma Agreement
Monthly license payment receivable	$ 350
Period until which monthly license payment is receivable	18 months
Abuse Deterrent Pharma, LLC
Monthly license payment receivable	$ 350
Abuse Deterrent Pharma, LLC | AD Pharma Agreement
Monthly license payment receivable	$ 350
Period until which monthly license payment is receivable	18 months	5 years