Condensed Consolidated Statements of Operations (Unaudited) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Consolidated Statements of Operations [Abstract]
Revenue	$ 43,907,000	$ 41,096,000	$ 123,993,000	$ 114,818,000
Cost of revenue	25,534,000	24,547,000	72,503,000	68,909,000
Gross profit	18,373,000	16,549,000	51,490,000	45,909,000
Operating expenses:
Selling, general and administrative	7,293,000	9,544,000	24,715,000	29,225,000
Research and development	5,084,000	5,707,000	15,974,000	16,976,000
Amortization of intangibles	51,000	51,000	153,000	153,000
Total operating expenses	12,428,000	15,302,000	40,842,000	46,354,000
Income (loss) from operations	5,945,000	1,247,000	10,648,000	(445,000)
Interest expense, net	(56,000)	(27,000)	(138,000)	(88,000)
Amortization of debt discount and prepaid debt costs	(16,000)		(42,000)	(55)
Gain on embedded derivatives				1,086,000
Income from operations before income taxes	5,873,000	1,220,000	10,468,000	498,000
Income tax provision	470,000	922,000	1,903,000	1,221,000
Net income (loss)	$ 5,403,000	$ 298,000	$ 8,565,000	$ (723,000)
Net income (loss) per share
Basic	$ 0.19	$ 0.01	$ 0.30	$ (0.03)
Diluted	$ 0.19	$ 0.01	$ 0.30	$ (0.03)
Weighted average common shares outstanding:
Basic	28,736	27,733	28,511	27,564
Diluted	28,748	28,161	28,695	27,564