CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net revenues:
Revenues	$ 86,453	$ 103,319
Cost of revenues:
Total cost of revenues	33,302	42,037
Gross profit	53,151	61,282
Operating expenses:
Research and development	15,425	16,285
Marketing and selling	25,289	24,878
General and administrative	12,744	13,788
Amortization of intangible assets	0	363
Restructuring costs, net	145	558
Total operating expenses	53,603	55,872
Operating income (loss)	(452)	5,410
Interest and other expense, net	(5,283)	(5,185)
Income (loss) before income taxes	(5,735)	225
Provision for (benefit from) income taxes	122	438
Net income (loss)	$ (5,857)	$ (213)
Net income (loss) per common share – basic and diluted	$ (0.14)	$ (0.01)
Weighted-average common shares outstanding – basic	43,254	42,046
Product [Member]
Net revenues:
Revenues	$ 34,711	$ 54,396
Cost of revenues:
Cost of revenues	20,962	27,600
Service [Member]
Net revenues:
Revenues	51,742	48,923
Cost of revenues:
Cost of revenues	12,340	12,487
Amortization of intangible assets [Member]
Cost of revenues:
Amortization of intangible assets	$ 0	$ 1,950