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Property and Equipment, Net - Summary of Property and Equipment, Net (Detail) (USD $)
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Dec. 31, 2013
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Dec. 31, 2012
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|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | $ 1,556,549 | $ 1,537,740 |
| Accumulated depreciation and amortization | (1,529,636) | (1,453,149) |
| Property and equipment, net | 26,913 | 84,591 |
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Furniture and Fixtures [Member]
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| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | 20,742 | 20,742 |
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Laboratory Equipment [Member]
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| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | 769,157 | 757,882 |
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Leasehold Improvements [Member]
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| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | 487,871 | 487,871 |
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Office and Computer Equipment [Member]
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| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | $ 278,779 | $ 271,245 |