Restatement of Previously Issued Financial Statements (Quarterly Consolidated Statement of Operations) (Details) (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
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)
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net			0	1,086
Income (loss) from operations before income taxes	5,644	1,491	6,156	(732)
Income Tax Expense (Benefit)	416	922	1,849	1,221
Net income (loss)	5,228	569	4,307	(1,953)
Earnings Per Share, Basic	$ 0.18	$ 0.02	$ 0.15	$ (0.07)
Earnings Per Share, Diluted	$ 0.18	$ 0.02	$ 0.15	$ (0.07)
Weighted Average Number of Shares Outstanding, Basic	28,736	27,733	28,511	27,564
Weighted Average Number of Shares Outstanding, Diluted	28,748	28,161	28,695	27,564
Scenario, Previously Reported [Member]
Revenue	43,907	41,096	123,993	114,818
Cost of revenue	25,534	24,547	72,503	68,909
Gross Profit	18,373	16,549	51,490	45,909
Operating expenses:
Selling, general and administrative	7,344	9,595	24,868	29,378
Research and development	5,084	5,707	15,974	16,976
Total operating expenses	12,428	15,302	40,842	46,354
Income (loss) from operations	5,945	1,247	10,648	(445)
Interest expense, net	(56)	(27)	(138)	(88)
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net				1,086
Income (loss) from operations before income taxes	5,873	1,220	10,468	498
Income Tax Expense (Benefit)	470	922	1,903	1,221
Net income (loss)	5,403	298	8,565	(723)
Earnings Per Share, Basic	$ 0.19	$ 0.01	$ 0.30	$ (0.03)
Earnings Per Share, Diluted	$ 0.19	$ 0.01	$ 0.30	$ (0.03)
Weighted Average Number of Shares Outstanding, Basic	28,736	27,733	28,511	27,564
Weighted Average Number of Shares Outstanding, Diluted	28,748	28,161	28,695	27,564
Restatement Adjustment [Member]
Revenue	(1,194)	934	(9,238)	(5,018)
Cost of revenue	(963)	653	(5,571)	(1,169)
Gross Profit	(231)	281	(3,667)	(3,849)
Operating expenses:
Selling, general and administrative	(2)	10	671	(2,619)
Research and development	0	0	(26)	0
Total operating expenses	(2)	10	645	(2,619)
Income (loss) from operations	(229)	271	(4,312)	(1,230)
Interest expense, net	0	0	0	0
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net				0
Income (loss) from operations before income taxes	(229)	271	(4,312)	(1,230)
Income Tax Expense (Benefit)	(54)	0	(54)	0
Net income (loss)	$ (175)	$ 271	$ (4,258)	$ (1,230)
Earnings Per Share, Basic	$ (0.01)	$ 0.01	$ (0.15)	$ (0.04)
Earnings Per Share, Diluted	$ (0.01)	$ 0.01	$ (0.15)	$ (0.04)