ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Organization (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2018 product	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2018 USD ($)
Organization
Number of products (product)	3
Commercialization agreement, net | Collegium Pharmaceutical Inc
Organization
Number of products marketed by Collegium (product)	2
Commercialization agreement, net | NUCYNTA products | Collegium Pharmaceutical Inc | Forecast
Organization
Minimum annual royalties | $		$ 135,000,000	$ 135,000,000	$ 132,000,000