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Common Stock - Summary of Outstanding Warrants (Detail) (USD $) | 9 Months Ended
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Sep. 30, 2014
Series A Warrants [Member] |
Class of Warrant or Right [Line Items] |
Total Outstanding and Exercisable | 2,779,933
Exercise price per Share | $ 4.00
Expiration Date | 2019-07
Series B Warrants [Member] |
Class of Warrant or Right [Line Items] |
Total Outstanding and Exercisable | 670,269
Exercise price per Share | $ 4.00
Expiration Date | 2019-07
Stock warrants [Member] |
Class of Warrant or Right [Line Items] |
Total Outstanding and Exercisable | 1,587,301
Exercise price per Share | $ 20.00
Expiration Date | 2015-10
Pre-Funded Series B Warrants [Member] |
Class of Warrant or Right [Line Items] |
Total Outstanding and Exercisable | 1,340,538
Exercise price per Share | $ 0.01
Expiration Date | 2019-07

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