CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net revenues:
Products	$ 54,319	$ 63,740	$ 152,980	$ 223,841
Services	50,946	55,279	158,765	172,794
Total net revenues	105,265	119,019	311,745	396,635
Cost of revenues:
Products	29,485	26,793	80,478	82,405
Services	13,472	14,885	41,747	45,126
Amortization of intangible assets	1,950	1,950	5,850	5,850
Total cost of revenues	44,907	43,628	128,075	133,381
Gross profit	60,358	75,391	183,670	263,254
Operating expenses:
Research and development	16,025	19,953	51,904	62,791
Marketing and selling	25,652	27,231	80,481	89,027
General and administrative	15,193	13,822	43,268	48,359
Amortization of intangible assets	362	567	1,088	2,135
Restructuring costs, net	(582)	5,314	6,464	7,878
Total operating expenses	56,650	66,887	183,205	210,190
Operating income	3,708	8,504	465	53,064
Interest and other expense, net	(4,701)	(4,707)	(13,465)	(14,049)
(Loss) income before income taxes	(993)	3,797	(13,000)	39,015
Benefit from income taxes	(1,065)	(5,321)	(326)	(3,983)
Net income (loss)	$ 72	$ 9,118	$ (12,674)	$ 42,998
Net income (loss) per common share - basic	$ 0.00	$ 0.23	$ (0.31)	$ 1.08
Net income (loss) per common share - diluted	$ 0.00	$ 0.23	$ (0.31)	$ 1.08
Weighted-average common shares outstanding – basic	41,133	40,194	40,954	39,814
Weighted-average common shares outstanding – diluted	41,355	40,476	40,954	39,950