Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements Of Operations [Abstract]
Revenue	$ 157,311	$ 121,882	$ 101,315
Cost of revenue	95,254	74,995	66,026
Gross profit	62,057	46,887	35,289
Operating expenses:
Selling, general and administrative	37,741	35,413	33,111
Research and development	22,330	17,736	15,955
Amortization of intangibles	203	233	353
Total operating expenses	60,274	53,382	49,419
Operating income (loss)	1,783	(6,495)	(14,130)
Interest expense, net	(109)	(188)	(254)
Amortization of debt discount and prepaid debt costs	(55)	(83)	(737)
Gain (loss) on embedded derivative and warrants	1,086	2,341	(5,251)
Income (loss) from operations before income taxes	2,705	(4,425)	(20,372)
Income tax provision	1,856	1,631	2,540
Net income (loss)	$ 849	$ (6,056)	$ (22,912)
Net income (loss) per share:
Basic	$ 0.03	$ (0.23)	$ (0.94)
Diluted	$ 0.03	$ (0.23)	$ (0.94)
Weighted average common shares outstanding:
Basic	27,637	26,234	24,457
Diluted	28,161	26,234	24,457