Condensed 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
Revenues	$ 35,093	$ 61,288	$ 72,703	$ 116,434
Cost of Goods Sold, Product	17,913	38,208	40,089	73,940
Revenue, Product	26,340	51,629	55,039	98,947
Revenue, Service	8,753	9,659	17,664	17,487
Cost of sales:
Cost of Goods Sold, Service	5,245	5,708	10,530	10,411
Amortization of purchased technology	1,927	1,927	3,854	3,854
Total cost of sales	25,085	45,843	54,473	88,205
Gross margin	10,008	15,445	18,230	28,229
Research and development	5,994	6,298	12,474	11,951
Selling, general and administrative	8,214	8,554	17,596	16,193
Intangible asset amortization	1,260	1,260	2,520	2,520
Restructuring and acquisition-related charges, net	1,235	265	1,470	947
Income (loss) from operations	(6,695)	(932)	(15,830)	(3,382)
Interest expense	(224)	(159)	(496)	(276)
Other income (expense), net	(130)	1,069	(427)	1,208
Income (loss) before income tax expense (benefit)	(7,049)	(22)	(16,753)	(2,450)
Income tax expense (benefit)	505	569	809	1,106
Net income (loss)	$ (7,554)	$ (591)	$ (17,562)	$ (3,556)
Net income (loss) per share:
Basic (in dollars per share)	$ (0.19)	$ (0.02)	$ (0.45)	$ (0.10)
Diluted (in dollars per share)	$ (0.19)	$ (0.02)	$ (0.45)	$ (0.10)
Weighted average shares outstanding:
Basic (in shares)	38,966	37,143	38,840	37,075
Diluted (in shares)	38,966	37,143	38,840	37,075