Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Revenue	$ 55,610	$ 36,238	$ 103,358	$ 72,042
Cost of revenue	34,034	21,714	63,552	42,361
Gross profit	21,576	14,524	39,806	29,681
Operating expenses:
Selling, general and administrative	11,988	8,409	23,490	18,197
Research and development	5,378	5,294	11,401	10,864
Total operating expenses	17,366	13,703	34,891	29,061
Income (loss) from operations	4,210	821	4,915	620
Interest expense, net	(41)	(56)	(85)	(82)
Amortization of debt discount and prepaid debt costs	(15)	(15)	(30)	(26)
Income from operations before income taxes	4,154	750	4,800	512
Income tax provision	749	719	1,673	1,433
Net income (loss)	$ 3,405	$ 31	$ 3,127	$ (921)
Net income (loss) per share:
Basic	$ 0.12	$ 0.00	$ 0.11	$ (0.03)
Diluted	$ 0.12	$ 0.00	$ 0.11	$ (0.03)
Weighted average common shares outstanding:
Basic	28,858	28,672	28,842	28,397
Diluted	28,860	28,780	28,859	28,397