CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net revenues:
Revenues	$ 79,281	$ 98,701	$ 165,734	$ 202,020
Cost of revenues:
Cost of Revenue	27,719	42,041	61,021	84,078
Gross profit	51,562	56,660	104,713	117,942
Operating expenses:
Research and development	13,068	15,180	28,493	31,465
Marketing and selling	19,690	26,129	44,979	51,007
General and administrative	10,604	12,721	23,348	26,509
Amortization of intangible assets	0	332	0	695
Restructuring costs, net	140	(269)	285	289
Total operating expenses	43,502	54,093	97,105	109,965
Operating income (loss)	8,060	2,567	7,608	7,977
Interest and other expense, net	(5,498)	(13,290)	(10,781)	(18,475)
Income (loss) before income taxes	2,562	(10,723)	(3,173)	(10,498)
Provision for (benefit from) income taxes	717	0	839	438
Net income (loss)	$ 1,845	$ (10,723)	$ (4,012)	$ (10,936)
Net income (loss) per common share – basic and diluted	$ 0.04	$ (0.25)	$ (0.09)	$ (0.26)
Weighted-average common shares outstanding – basic	43,719	42,560	43,486	42,305
Products
Net revenues:
Revenues	$ 27,635	$ 50,326	$ 62,346	$ 104,722
Cost of revenues:
Cost of revenues	16,954	28,058	37,916	55,658
Services
Net revenues:
Revenues	51,646	48,375	103,388	97,298
Cost of revenues:
Cost of revenues	10,765	12,195	23,105	24,682
Amortization of intangible assets
Cost of revenues:
Amortization of intangible assets	$ 0	$ 1,788	$ 0	$ 3,738