REVENUE RECOGNITION AND RELATED ALLOWANCES - Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue recognition	$ 48,625	$ 48,470	$ 103,146	$ 98,244
Sales of generic pharmaceutical products [Member]
Revenue recognition	34,199	33,400	66,812	70,895
Sales of branded pharmaceutical products [Member]
Revenue recognition	11,038	10,633	18,555	19,790
Sales of contract manufactured products [Member]
Revenue recognition	2,322	2,900	4,895	4,874
Royalties from licensing agreements [Member]
Revenue recognition		491	11,210	781
Product development services [Member]
Revenue recognition	97	885	255	1,462
Other [Member]
Revenue recognition	$ 969	$ 161	$ 1,419	$ 442