CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net revenues:
Revenues	$ 90,431	$ 93,461	$ 256,165	$ 295,481
Cost of revenues:
Total cost of revenues	32,174	35,603	93,195	119,681
Gross profit	58,257	57,858	162,970	175,800
Operating expenses:
Research and development	13,623	14,860	42,116	46,325
Marketing and selling	19,998	22,334	64,977	73,341
General and administrative	10,796	12,034	34,144	38,543
Amortization of intangible assets	0	0	0	695
Restructuring costs, net	723	229	1,008	518
Total operating expenses	45,140	49,457	142,245	159,422
Operating income	13,117	8,401	20,725	16,378
Interest and other expense, net	(4,423)	(5,519)	(15,204)	(23,994)
Income (loss) before income taxes	8,694	2,882	5,521	(7,616)
Provision for income taxes	707	(283)	1,546	155
Net income (loss)	$ 7,987	$ 3,165	$ 3,975	$ (7,771)
Net income (loss) per common share – basic and diluted	$ 0.18	$ 0.07	$ 0.09	$ (0.18)
Weighted-average common shares outstanding – basic	44,019	42,913	43,665	42,510
Weighted-average common shares outstanding – diluted	44,758	43,674	44,498	42,510
Products
Net revenues:
Revenues	$ 35,775	$ 42,911	$ 98,121	$ 147,633
Cost of revenues:
Cost of revenues	20,957	23,877	58,873	79,535
Services
Net revenues:
Revenues	54,656	50,550	158,044	147,848
Cost of revenues:
Cost of revenues	11,217	11,726	34,322	36,408
Amortization of intangible assets
Cost of revenues:
Amortization of intangible assets	$ 0	$ 0	$ 0	$ 3,738