Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
Revenue	$ 51,197	$ 42,713	$ 154,555	$ 114,755
Cost of revenue	30,084	24,571	93,636	66,932
Gross profit	21,113	18,142	60,919	47,823
Operating expenses:
Selling, general and administrative	9,455	7,342	32,945	25,539
Research and development	5,450	5,084	16,851	15,948
Total operating expenses	14,905	12,426	49,796	41,487
Income (loss) from operations	6,208	5,716	11,123	6,336
Interest expense, net	36	56	121	138
Amortization of debt discount and prepaid debt costs	16	16	46	42
Income from operations before income taxes	6,156	5,644	10,956	6,156
Income tax provision	129	416	1,802	1,849
Net income (loss)	$ 6,027	$ 5,228	$ 9,154	$ 4,307
Net income (loss) per share:
Basic	$ 0.21	$ 0.18	$ 0.32	$ 0.15
Diluted	$ 0.21	$ 0.18	$ 0.32	$ 0.15
Weighted average common shares outstanding:
Basic	28,884	28,736	28,857	28,511
Diluted	28,940	28,748	28,883	28,695