CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Net sales	$ 267,021	$ 243,975	$ 796,259	$ 705,871
Cost of sales	146,527	141,961	439,732	415,857
Gross profit	120,494	102,014	356,527	290,014
Operating expenses:
Selling, general and administrative	86,474	72,215	259,061	217,790
Research and development	16,974	13,506	50,841	42,404
Legal settlement				18,200
Impairment charges	0	20,585	4,283	28,305
Contingent consideration expense (benefit)	1,115	(4,356)	3,322	884
Total operating expenses	104,563	101,950	317,507	307,583
Income (loss) from operations	15,931	64	39,020	(17,569)
Other income (expense):
Interest income	104	67	668	234
Interest expense	(1,233)	(2,197)	(4,156)	(8,056)
Other expense - net	(625)	(118)	(1,796)	(1,085)
Total other expense - net	(1,754)	(2,248)	(5,284)	(8,907)
Income (loss) before income taxes	14,177	(2,184)	33,736	(26,476)
Income tax expense (benefit)	2,210	825	5,895	(1,255)
Net income (loss)	$ 11,967	$ (3,009)	$ 27,841	$ (25,221)
Earnings (loss) per common share
Basic (in dollars per share)	$ 0.21	$ (0.05)	$ 0.50	$ (0.46)
Diluted (in dollars per share)	$ 0.21	$ (0.05)	$ 0.49	$ (0.46)
Weighted average shares outstanding
Basic (in shares)	56,302	55,505	56,033	55,386
Diluted (in shares)	57,549	55,505	57,274	55,386