Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues	$ 47,049	$ 49,964	$ 95,736	$ 93,763
Cost of sales:
Cost of sales	32,468	35,902	66,535	66,499
Amortization of purchased technology	1,980	2,055	3,974	4,109
Total cost of sales	34,448	37,957	70,509	70,608
Gross margin	12,601	12,007	25,227	23,155
Research and development	6,840	8,408	13,564	16,827
Selling, general and administrative	7,475	8,953	14,975	18,549
Intangible asset amortization	1,260	1,260	2,520	2,557
Restructuring and acquisition-related charges, net	559	815	4,694	2,115
Income (loss) from operations	(3,533)	(7,429)	(10,526)	(16,893)
Interest expense	(103)	(345)	(320)	(632)
Other income (expense), net	161	157	558	336
Income (loss) before income tax expense (benefit)	(3,475)	(7,617)	(10,288)	(17,189)
Income tax expense (benefit)	644	594	884	1,456
Net income (loss)	$ (4,119)	$ (8,211)	$ (11,172)	$ (18,645)
Net income (loss) per share:
Basic (in dollars per share)	$ (0.11)	$ (0.23)	$ (0.30)	$ (0.57)
Diluted (in dollars per share)	$ (0.11)	$ (0.23)	$ (0.30)	$ (0.57)
Weighted average shares outstanding:
Basic (in shares)	36,741	36,096	36,695	32,980
Diluted (in shares)	36,741	36,096	36,695	32,980