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Common Stock - Summary of Outstanding Warrants (Parenthetical) (Detail)
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9 Months Ended |
|---|---|
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Sep. 30, 2014
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Series A Warrants [Member]
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| Class of Warrant or Right [Line Items] | |
| Warrants issued date | 2014-07 |
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Series B Warrants [Member]
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| Class of Warrant or Right [Line Items] | |
| Warrants issued date | 2014-07 |
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Stock warrants [Member]
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| Class of Warrant or Right [Line Items] | |
| Warrants issued date | 2010-10 |
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Pre-Funded Series B Warrants [Member]
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| Class of Warrant or Right [Line Items] | |
| Warrants issued date | 2014-07 |