CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net revenues:
Products	$ 52,133	$ 54,319	$ 144,922	$ 152,980
Services	51,913	50,946	155,676	158,765
Total net revenues	104,046	105,265	300,598	311,745
Cost of revenues:
Products	27,042	29,485	79,684	80,478
Services	14,443	13,472	42,414	41,747
Amortization of intangible assets	1,950	1,950	5,850	5,850
Total cost of revenues	43,435	44,907	127,948	128,075
Gross profit	60,611	60,358	172,650	183,670
Operating expenses:
Research and development	15,873	16,025	47,543	51,904
Marketing and selling	23,461	25,652	77,352	80,481
General and administrative	13,660	15,193	41,656	43,268
Amortization of intangible assets	363	362	1,089	1,088
Restructuring costs, net	(226)	582	(3,401)	(6,464)
Total operating expenses	53,583	56,650	171,041	183,205
Operating income	7,028	3,708	1,609	465
Interest and other expense, net	(5,725)	(4,701)	(17,362)	(13,465)
(Loss) income before income taxes	1,303	(993)	(15,753)	(13,000)
Provision for (benefit from) income taxes	425	(1,065)	824	(326)
Net (loss) income	$ 878	$ 72	$ (16,577)	$ (12,674)
Net (loss) income per common share - basic	$ 0.02	$ 0.00	$ (0.40)	$ (0.31)
Weighted-average common shares outstanding – basic	41,792	41,133	41,596	40,954
Weighted-average common shares outstanding – diluted	42,226	41,355	41,596	40,954