REVENUE RECOGNITION AND RELATED ALLOWANCES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue Recognition	$ 48,470	$ 54,357	$ 98,244	$ 107,244
Sales of generic pharmaceutical products [Member]
Revenue Recognition	33,400	36,255	70,895	67,854
Sales of branded pharmaceutical products [Member]
Revenue Recognition	10,633	13,996	19,790	31,539
Sales of contract manufactured products [Member]
Revenue Recognition	2,900	3,687	4,874	6,124
Royalties from licensing agreements [Member]
Revenue Recognition	491	(251)	781	326
Product development services [Member]
Revenue Recognition	885	411	1,462	731
Other [Member]
Revenue Recognition	$ 161	$ 259	$ 442	$ 670