QUARTERLY FINANCIAL DATA (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
QUARTERLY FINANCIAL DATA
Net revenues		$ 47,966	$ 51,337	$ 54,357	$ 52,887	$ 57,122	$ 50,703	$ 47,268	$ 46,483	$ 206,547	$ 201,576	$ 176,842
Total operating expenses		52,637	44,009	45,065	48,485	45,677	40,589	40,005	39,946	190,196	166,217	148,513
Operating income		(4,671)	7,328	9,292	4,402	11,445	10,114	7,263	6,537	16,351	35,359	28,329
(Provision)/benefit for income taxes		2,817	(64)	653	(469)	(1,910)	(1,329)	(726)	(592)	2,937	(4,557)	(17,425)
Net income/(loss)		$ (4,835)	$ 3,895	$ 6,585	$ 449	$ 5,430	$ 5,037	$ 2,777	$ 2,250	$ 6,094	$ 15,494	$ (1,076)
Basic and diluted earnings/(loss) per share:
Basic earnings/(loss) per share		$ (0.41)	$ 0.32	$ 0.55	$ 0.04	$ 0.46	$ 0.43	$ 0.24	$ 0.19	$ 0.51	$ 1.31	$ (0.09)
Diluted earnings/(loss) per share		$ (0.41)	$ 0.32	$ 0.53	$ 0.04	$ 0.46	$ 0.42	$ 0.23	$ 0.19	$ 0.50	$ 1.30	$ (0.09)
Inventory Reserve Charges	$ 4,600	$ 4,600
Cortrophin pre-launch charges		$ 6,500								$ 6,706	$ 0	$ 0