Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Income Statement [Abstract]
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 from operations before income taxes	646	(238)
Income tax provision	924	714
Net loss	$ (278)	$ (952)
Net loss per share:
Basic (in dollars per share)	$ (0.01)	$ (0.03)
Diluted (in dollars per share)	$ (0.01)	$ (0.03)
Weighted average common shares outstanding:
Basic (in shares)	28,825	28,122
Diluted (in shares)	28,825	28,122

Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.