SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Concentration of Credit Risk and Major Customers and Revenue Recognition (Details)	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 29, 2016 USD ($)	Sep. 30, 2017 USD ($) Customer	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) Customer	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Concentration Risk [Line Items]
Royalty revenue		$ 6,511,700	$ 6,119,815	$ 20,729,017	$ 18,843,273
Accounts receivable		4,681,885		4,681,885		$ 3,810,792
Royalty / Mark-Up on Cost of Goods Sold [Abstract]
Deferred revenue recognized		4,408	12,345	13,226	37,034
Licensing Revenue [Abstract]
Recognized milestone revenue		$ 0	0	$ 0	0
Endo [Member]
Concentration Risk [Line Items]
Number of customers | Customer		1		1
Royalty revenue		$ 6,500,000	6,900,000	$ 20,700,000	19,600,000
Accounts receivable		4,700,000		4,700,000		$ 3,800,000
Royalty / Mark-Up on Cost of Goods Sold [Abstract]
Deferred revenue on licensing agreements		8,250,000		8,250,000
Proceeds from licensing agreement	$ 8,250,000
Deferred revenue recognized		$ 266,000	$ 274,000	$ 895,000	$ 546,000