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Summary of Significant Accounting Policies - Schedule of Estimated Useful Life of Assets (Detail)
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9 Months Ended |
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Sep. 30, 2014
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Laboratory Equipment [Member]
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| Property, Plant and Equipment [Line Items] | |
| Estimated Useful Life | 3 years |
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Office and Computer Equipment [Member]
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| Property, Plant and Equipment [Line Items] | |
| Estimated Useful Life | 3 years |
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Leasehold Improvements [Member]
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| Property, Plant and Equipment [Line Items] | |
| Estimated Useful Life | 5 years |
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Furniture and Fixtures [Member]
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| Property, Plant and Equipment [Line Items] | |
| Estimated Useful Life | 5 years |