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Revenue (Detail) (USD $) | 6 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Small Business Innovative Research | Jun. 30, 2012 Small Business Innovative Research | Jun. 30, 2013 Small Business Innovative Research | Jun. 30, 2012 Small Business Innovative Research | Oct. 31, 2010 Vulcan Incorporated | Mar. 31, 2013 Vulcan Incorporated | Jun. 30, 2012 Vulcan Incorporated | Jun. 30, 2013 Vulcan Incorporated | Jun. 30, 2012 Vulcan Incorporated | Mar. 31, 2012 Life Sciences Discovery Fund Authority | Oct. 31, 2010 Life Sciences Discovery Fund Authority
Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Grant revenue recognized |  |  | $ 140,000 | $ 329,000 | $ 265,000 | $ 489,000 |  |  |  |  |  | $ 624,000 |
Remaining available amount under grant |  |  | 1,600,000 |  | 1,600,000 |  |  |  |  |  |  |  |
Grants received |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |
Cost reduction to intellectual property assets |  |  |  |  |  |  | 10,800,000 |  |  |  |  |  |
Fair value of warrants issued |  |  |  |  |  |  | 994,000 |  |  |  |  |  |
Deferred revenue |  |  |  |  |  |  | 8,200,000 |  |  |  |  |  |
Maximum contractual amount from grant |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000
Reductions to deferred revenue |  |  |  |  |  |  |  | 970,000 | 1,300,000 | 970,000 | 2,000,000 |  |
Deferred Revenue, Revenue Recognized |  |  |  |  |  |  |  |  | 1,200,000 |  | 1,900,000 |  |
Reduction of equipment cost basis due to assets purchased with grant funding | $ 0 | $ 59,000 |  |  |  |  |  |  |  |  | $ 60,000 |  |

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- Definition Reduction of equipment cost basis due to assets purchased with third-party funding. + References No definition available. + Details
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- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response) -URI http://asc.fasb.org/extlink&oid=6600647&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A + Details
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