Condensed Consolidated Statements of Operations (Unaudited) (USD $) 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
Income Statement [Abstract]
Revenue	$ 42,713	$ 42,030	$ 114,755	$ 109,800
Cost of revenue	24,571	25,200	66,932	67,740
Gross profit	18,142	16,830	47,823	42,060
Operating expenses:
Selling, general and administrative	7,342	9,605	25,539	26,759
Research and development	5,084	5,707	15,948	16,976
Total operating expenses	12,426	15,312	41,487	43,735
Income (loss) from operations	5,716	1,518	6,336	(1,675)
Interest expense, net	(56)	(27)	(138)	(88)
Amortization of debt discount and prepaid debt costs	(16)	0	(42)	(55)
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net			0	1,086
Income from operations before income taxes	5,644	1,491	6,156	(732)
Income tax provision	416	922	1,849	1,221
Net income (loss)	$ 5,228	$ 569	$ 4,307	$ (1,953)
Net income (loss) per share:
Basic	$ 0.18	$ 0.02	$ 0.15	$ (0.07)
Diluted	$ 0.18	$ 0.02	$ 0.15	$ (0.07)
Weighted average common shares outstanding:
Basic	28,736	27,733	28,511	27,564
Diluted	28,748	28,161	28,695	27,564