ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Commercialization Agreement (Details) - Contract asset - Collegium, net - Amended Commercialization Agreement $ / shares in Units, $ in Millions	Nov. 08, 2018 USD ($) $ / shares shares
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Warrant, number of shares (in shares) | shares	1,041,667
Warrant, exercise price per share (in dollars per share) | $ / shares	$ 19.20
Warrant, exercise period	4 years
Warrants outstanding | $	$ 8.8