CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales	$ 280,325	$ 218,371	$ 529,238	$ 461,896
Cost of sales	156,186	134,155	293,205	273,896
Gross profit	124,139	84,216	236,033	188,000
Operating expenses:
Selling, general and administrative	91,563	66,767	172,587	145,575
Research and development	17,593	14,026	33,867	28,898
Legal settlement		18,200		18,200
Impairment charges	4,283	3,875	4,283	7,720
Contingent consideration expense	1,805	343	2,207	5,240
Total operating expenses	115,244	103,211	212,944	205,633
Income (loss) from operations	8,895	(18,995)	23,089	(17,633)
Other income (expense):
Interest income	92	88	564	167
Interest expense	(1,386)	(2,715)	(2,923)	(5,859)
Other expense - net	(736)	(678)	(1,171)	(967)
Total other expense - net	(2,030)	(3,305)	(3,530)	(6,659)
Income (loss) before income taxes	6,865	(22,300)	19,559	(24,292)
Income tax expense (benefit)	1,949	(3,242)	3,685	(2,080)
Net income (loss)	$ 4,916	$ (19,058)	$ 15,874	$ (22,212)
Earnings (loss) per common share
Basic (in dollars per share)	$ 0.09	$ (0.34)	$ 0.28	$ (0.40)
Diluted (in dollars per share)	$ 0.09	$ (0.34)	$ 0.28	$ (0.40)
Weighted average shares outstanding
Basic (in shares)	56,061	55,406	55,890	55,326
Diluted (in shares)	57,277	55,406	57,128	55,326