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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue	$ 55,610	$ 36,238	$ 103,358	$ 72,042
Cost of revenue	34,034	21,714	63,552	42,361
Gross Profit	21,576	14,524	39,806	29,681
Operating expenses:
Selling, general and administrative	11,988	8,409	23,490	18,197
Research and development	5,378	5,294	11,401	10,864
Total operating expenses	17,366	13,703	34,891	29,061
Income (loss) from operations	4,210	821	4,915	620
Interest expense, net	(41)	(56)	(85)	(82)
Amortization of debt discount and prepaid debt costs	15	15	30	26
Income (loss) from operations before income taxes	4,154	750	4,800	512
Income tax provision	749	719	1,673	1,433
Net income (loss)	3,405	31	3,127	(921)
Net income (loss) per share:
Earnings per share, basic	$ 0.12	$ 0.00	$ 0.11	$ (0.03)
Earnings per share, diluted	$ 0.12	$ 0.00	$ 0.11	$ (0.03)
Weighted average common shares outstanding:
Weighted average number of shares outstanding, basic	28,858	28,672	28,842	28,397
Weighted average number of shares outstanding, diluted	28,860	28,780	28,859	28,397
Scenario, Previously Reported [Member]
Revenue		40,856		80,086
Cost of revenue		23,876		46,969
Gross Profit		16,980		33,117
Operating expenses:
Selling, general and administrative		8,238		17,524
Research and development		5,294		10,890
Total operating expenses		13,532		28,414
Income (loss) from operations		3,448		4,703
Interest expense, net		(56)		(82)
Amortization of debt discount and prepaid debt costs		15		26
Income (loss) from operations before income taxes		3,377		4,595
Income tax provision		719		1,433
Net income (loss)		2,658		3,162
Net income (loss) per share:
Earnings per share, basic		$ 0.09		$ 0.11
Earnings per share, diluted		$ 0.09		$ 0.11
Weighted average common shares outstanding:
Weighted average number of shares outstanding, basic		28,672		28,397
Weighted average number of shares outstanding, diluted		28,780		28,680
Restatement Adjustment [Member]
Revenue		(4,618)		(8,044)
Cost of revenue		(2,162)		(4,608)
Gross Profit		(2,456)		(3,436)
Operating expenses:
Selling, general and administrative		171		673
Research and development		0		(26)
Total operating expenses		171		647
Income (loss) from operations		(2,627)		(4,083)
Interest expense, net		0		0
Amortization of debt discount and prepaid debt costs		0		0
Income (loss) from operations before income taxes		(2,627)		(4,083)
Income tax provision		0		0
Net income (loss)		$ (2,627)		$ (4,083)
Net income (loss) per share:
Earnings per share, basic		$ (0.09)		$ (0.14)
Earnings per share, diluted		$ (0.09)		$ (0.14)