CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net revenues:
Products	$ 47,655	$ 75,592	$ 98,661	$ 160,101
Services	54,718	58,477	107,819	117,515
Total net revenues	102,373	134,069	206,480	277,616
Cost of revenues:
Products	26,489	28,488	50,993	55,612
Services	14,181	15,832	28,275	30,241
Amortization of intangible assets	1,950	1,950	3,900	3,900
Total cost of revenues	42,620	46,270	83,168	89,753
Gross profit	59,753	87,799	123,312	187,863
Operating expenses:
Research and development	16,991	21,433	35,879	42,838
Marketing and selling	29,018	30,177	54,829	61,796
General and administrative	13,644	16,818	28,075	34,537
Amortization of intangible assets	363	782	726	1,568
Restructuring costs, net	6,063	(213)	7,046	2,564
Total operating expenses	66,079	68,997	126,555	143,303
Operating (loss) income	(6,326)	18,802	(3,243)	44,560
Interest and other expense, net	(3,918)	(5,159)	(8,764)	(9,342)
(Loss) income before income taxes	(10,244)	13,643	(12,007)	35,218
Provision for income taxes	587	703	739	1,338
Net (loss) income	$ (10,831)	$ 12,940	$ (12,746)	$ 33,880
Net (loss) income per common share - basic	$ (0.26)	$ 0.33	$ (0.31)	$ 0.86
Net (loss) income per common share - diluted	$ (0.26)	$ 0.33	$ (0.31)	$ 0.85
Weighted-average common shares outstanding – basic	40,953	39,678	40,863	39,622
Weighted-average common shares outstanding – diluted	40,953	39,734	40,863	39,691