SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Concentration of Credit Risk and Major Customers and Revenue Recognition (Details)	1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 29, 2016 USD ($)	Jun. 30, 2017 USD ($) Customer	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) Customer	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Concentration Risk [Line Items]
Royalty revenue		$ 6,531,107	$ 6,167,811	$ 14,217,317	$ 12,723,458
Accounts receivable		4,663,282		4,663,282		$ 3,810,792
Royalty / Mark-Up on Cost of Goods Sold [Abstract]
Deferred revenue recognized		4,409	12,345	8,818	24,689
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	6,200,000	$ 14,200,000	12,700,000
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		$ 373,000	$ 272,000	$ 629,000	$ 272,000