Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Consolidated Statements of Operations
Net sales	$ 163,999	$ 146,344	$ 320,425	$ 280,059
Cost of sales	99,732	86,178	190,146	164,978
Gross profit	64,267	60,166	130,279	115,081
Operating expenses, net:
Research and development	26,016	22,553	50,133	44,398
Selling, general, and administrative	22,950	21,466	45,844	41,722
Amortization of intangible assets	2,505	2,976	5,009	6,330
Other operating expense (income), net	(27)	(81)	(47)	(36)
Total operating expenses, net	51,444	46,914	100,939	92,414
Operating income	12,823	13,252	29,340	22,667
Interest income	213	235	302	370
Interest expense	(2,848)	(6,820)	(5,740)	(13,578)
Income before income taxes	10,188	6,667	23,902	9,459
Income tax expense (benefit)	533	319	917	617
Net income	$ 9,655	$ 6,348	$ 22,985	$ 8,842
Income per common share:
Basic (in dollars per share)	$ 0.19	$ 0.13	$ 0.46	$ 0.18
Diluted (in dollars per share)	$ 0.18	$ 0.12	$ 0.43	$ 0.17
Weighted average number of shares:
Basic (in shares)	49,697	48,743	49,702	48,758
Diluted (in shares)	59,455	53,942	59,521	53,539