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Warrants Issued to Purchase Common Stock (Detail)
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12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Apr. 30, 2010
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Apr. 16, 2010
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Nov. 30, 2009
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Apr. 18, 2006
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Dec. 31, 2013
2007 Loan Agreement
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Dec. 31, 2013
Warrant One
2007 Loan Agreement
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Dec. 31, 2013
Warrant Two
2007 Loan Agreement
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Dec. 31, 2013
Warrant Three
2007 Loan Agreement
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Dec. 31, 2013
Warrant Four
2007 Loan Agreement
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| Class Of Warrant Or Right [Line Items] | ||||||||||
| Warrant Issuance Date | Jul. 18, 2007 | Oct. 18, 2007 | Dec. 27, 2007 | Dec. 27, 2007 | ||||||
| Shares Issuable | 3,550,000 | 1,250,000 | 1,300,000 | 300,000 | 700,000 | |||||
| Expiration Date | Feb. 26, 2014 | Feb. 26, 2014 | Feb. 26, 2014 | Feb. 26, 2014 | ||||||
| Warrants exercise price | 1.96 | 1.50 | 1.50 | 1.94 | 7.32 | 5.13 | 1.68 | 5.65 | 1.68 | |
| Outstanding | 10,913,873 | 1,550,000 | 1,250,000 | 300,000 | ||||||