CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net revenues:
Revenues	$ 94,876	$ 79,281	$ 189,240	$ 165,734
Cost of revenues:
Total cost of revenues	34,738	27,719	67,686	61,021
Gross profit	60,138	51,562	121,554	104,713
Operating expenses:
Research and development	16,093	13,068	31,510	28,493
Marketing and selling	21,354	19,690	42,098	44,979
General and administrative	13,678	10,604	27,313	23,348
Restructuring costs, net	15	140	1,089	285
Total operating expenses	51,140	43,502	102,010	97,105
Operating income	8,998	8,060	19,544	7,608
Interest and other expense, net	(1,633)	(5,498)	(7,306)	(10,781)
Income (loss) before income taxes	7,365	2,562	12,238	(3,173)
Provision for income taxes	359	717	841	839
Net income (loss)	$ 7,006	$ 1,845	$ 11,397	$ (4,012)
Net income (loss) per common share – basic	$ 0.15	$ 0.04	$ 0.25	$ (0.09)
Net income (loss) per common share – diluted	$ 0.15	$ 0.04	$ 0.25	$ (0.09)
Weighted-average common shares outstanding – basic	45,211	43,719	44,887	43,486
Weighted-average common shares outstanding – diluted	46,550	44,180	46,420	43,486
Products
Net revenues:
Revenues	$ 37,178	$ 27,635	$ 70,445	$ 62,346
Cost of revenues:
Total cost of revenues	20,083	16,954	39,576	37,916
Services
Net revenues:
Revenues	57,698	51,646	118,795	103,388
Cost of revenues:
Total cost of revenues	$ 14,655	$ 10,765	$ 28,110	$ 23,105