Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Revenue	$ 41,593	$ 51,197	$ 133,668	$ 154,555
Cost of revenue	26,123	30,084	83,728	93,636
Gross profit	15,470	21,113	49,940	60,919
Operating expenses:
Selling, general and administrative	10,823	9,455	32,706	32,945
Research and development	6,923	5,450	19,317	16,851
Total operating expenses	17,746	14,905	52,023	49,796
Income (loss) from operations	(2,276)	6,208	(2,083)	11,123
Interest expense, net	49	36	116	121
Amortization of debt discount and prepaid debt costs	5	16	15	46
Income (loss) from operations before income taxes	(2,330)	6,156	(2,214)	10,956
Income tax provision	962	129	1,940	1,802
Net income (loss)	$ (3,292)	$ 6,027	$ (4,154)	$ 9,154
Net income (loss) per share:
Basic	$ (0.11)	$ 0.21	$ (0.14)	$ 0.32
Diluted	$ (0.11)	$ 0.21	$ (0.14)	$ 0.32
Weighted average common shares outstanding:
Basic	29,284	28,884	29,146	28,857
Diluted	29,284	28,940	29,146	28,883