Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Revenue	$ 46,074	$ 55,610	$ 92,075	$ 103,358
Cost of revenue	29,474	34,034	57,605	63,552
Gross profit	16,600	21,576	34,470	39,806
Operating expenses:
Selling, general and administrative	10,944	11,988	21,883	23,490
Research and development	6,223	5,378	12,394	11,401
Total operating expenses	17,167	17,366	34,277	34,891
Income (loss) from operations	(567)	4,210	193	4,915
Interest expense, net	28	41	67	85
Amortization of debt discount and prepaid debt costs	5	15	10	30
Income (loss) from operations before income taxes	(600)	4,154	116	4,800
Income tax provision	581	749	978	1,673
Net income (loss)	$ (1,181)	$ 3,405	$ (862)	$ 3,127
Net income (loss) per share:
Basic	$ (0.04)	$ 0.12	$ (0.03)	$ 0.11
Diluted	$ (0.04)	$ 0.12	$ (0.03)	$ 0.11
Weighted average common shares outstanding:
Basic	29,206	28,858	29,127	28,842
Diluted	29,206	28,860	29,127	28,859