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
	Mar. 31, 2013	Mar. 31, 2012
Revenue	$ 47,748	$ 35,804
Cost of revenue	29,518	20,647
Gross Profit	18,230	15,157
Operating expenses:
Selling, general and administrative	11,502	9,788
Research and development	6,023	5,570
Total operating expenses	17,525	15,358
Income (loss) from operations	705	(201)
Interest expense, net	(44)	(26)
Amortization of debt discount and prepaid debt costs	(15)	(11)
Income (loss) from operations before income taxes	646	(238)
Income tax provision	924	714
Net income (loss)	(278)	(952)
Net income (loss) per share:
Earnings per share, basic	$ (0.01)	$ (0.03)
Earnings per share, diluted	$ (0.01)	$ (0.03)
Weighted average common shares outstanding:
Weighted average number of shares outstanding, basic	28,825	28,122
Weighted average number of shares outstanding, diluted	28,825	28,122
Scenario, Previously Reported [Member]
Revenue		39,230
Cost of revenue		23,093
Gross Profit		16,137
Operating expenses:
Selling, general and administrative		9,286
Research and development		5,596
Total operating expenses		14,882
Income (loss) from operations		1,255
Interest expense, net		(26)
Amortization of debt discount and prepaid debt costs		(11)
Income (loss) from operations before income taxes		1,218
Income tax provision		714
Net income (loss)		504
Net income (loss) per share:
Earnings per share, basic		$ 0.02
Earnings per share, diluted		$ 0.02
Weighted average common shares outstanding:
Weighted average number of shares outstanding, basic		28,122
Weighted average number of shares outstanding, diluted		28,559
Restatement Adjustment [Member]
Revenue		(3,426)
Cost of revenue		(2,446)
Gross Profit		(980)
Operating expenses:
Selling, general and administrative		502
Research and development		(26)
Total operating expenses		476
Income (loss) from operations		(1,456)
Interest expense, net		0
Amortization of debt discount and prepaid debt costs		0
Income (loss) from operations before income taxes		(1,456)
Income tax provision		0
Net income (loss)		$ (1,456)
Net income (loss) per share:
Earnings per share, basic		$ (0.05)
Earnings per share, diluted		$ (0.05)