CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
NET SALES	$ 243,975	$ 243,049	$ 705,871	$ 736,930
COST OF SALES	141,961	138,913	415,857	416,194
GROSS PROFIT	102,014	104,136	290,014	320,736
OPERATING EXPENSES:
Selling, general and administrative	72,215	86,936	217,790	245,183
Research and development	13,506	16,987	42,404	49,361
Legal settlement			18,200
Impairment charges	20,585	2,702	28,305	3,250
Contingent consideration expense (benefit)	(4,356)	392	884	3,573
Acquired in-process research and development				525
Total operating expenses	101,950	107,017	307,583	301,892
INCOME (LOSS) FROM OPERATIONS	64	(2,881)	(17,569)	18,844
OTHER INCOME (EXPENSE):
Interest income	67	328	234	1,027
Interest expense	(2,197)	(3,415)	(8,056)	(9,295)
Other income (expense) - net	(118)	278	(1,085)	(421)
Total other expense - net	(2,248)	(2,809)	(8,907)	(8,689)
INCOME (LOSS) BEFORE INCOME TAXES	(2,184)	(5,690)	(26,476)	10,155
INCOME TAX (BENEFIT) EXPENSE	825	(2,292)	(1,255)	499
NET INCOME (LOSS)	$ (3,009)	$ (3,398)	$ (25,221)	$ 9,656
EARNINGS (LOSS) PER COMMON SHARE:
Basic (in dollars per share)	$ (0.05)	$ (0.06)	$ (0.46)	$ 0.18
Diluted (in dollars per share)	$ (0.05)	$ (0.06)	$ (0.46)	$ 0.17
AVERAGE COMMON SHARES:
Basic (in shares)	55,505	55,152	55,386	55,029
Diluted (in shares)	55,505	55,152	55,386	56,393