CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net revenues:
Revenues	$ 101,640	$ 90,431	$ 290,880	$ 256,165
Cost of revenues:
Total cost of revenues	35,737	32,174	103,423	93,195
Gross profit	65,903	58,257	187,457	162,970
Operating expenses:
Research and development	17,129	13,623	48,639	42,116
Marketing and selling	24,413	19,998	66,511	64,977
General and administrative	14,901	10,796	42,214	34,144
Restructuring costs, net	(88)	723	1,001	1,008
Total operating expenses	56,355	45,140	158,365	142,245
Operating income	9,548	13,117	29,092	20,725
Interest expense, net	(1,646)	(4,566)	(5,547)	(15,437)
Other income, net	7,864	143	4,459	233
Income before income taxes	15,766	8,694	28,004	5,521
Provision for income taxes	991	707	1,832	1,546
Net income	$ 14,775	$ 7,987	$ 26,172	$ 3,975
Net income per common share – basic	$ 0.32	$ 0.18	$ 0.58	$ 0.09
Net income per common share – diluted	$ 0.32	$ 0.18	$ 0.56	$ 0.09
Weighted-average common shares outstanding – basic	45,564	44,019	45,115	43,665
Weighted-average common shares outstanding – diluted	46,428	44,758	46,449	44,498
Products
Net revenues:
Revenues	$ 36,850	$ 35,775	$ 107,295	$ 98,121
Cost of revenues:
Total cost of revenues	20,468	20,957	60,044	58,873
Services
Net revenues:
Revenues	64,790	54,656	183,585	158,044
Cost of revenues:
Total cost of revenues	$ 15,269	$ 11,217	$ 43,379	$ 34,322