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Property and Equipment, net - Schedule of Property and Equipment, Net (Detail) (USD $)
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Sep. 30, 2014
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Dec. 31, 2013
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|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment - at cost | $ 583,940 | $ 1,366,935 |
| Less accumulated depreciation | (446,933) | (1,214,332) |
| Property and equipment - net | 137,007 | 152,603 |
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Laboratory Equipment [Member]
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| Property, Plant and Equipment [Line Items] | ||
| Property and equipment - at cost | 245,450 | 1,106,761 |
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Office and Computer Equipment [Member]
|
||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment - at cost | 192,344 | 137,974 |
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Leasehold Improvements [Member]
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||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment - at cost | 94,855 | 69,296 |
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Furniture and Fixtures [Member]
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| Property, Plant and Equipment [Line Items] | ||
| Property and equipment - at cost | $ 51,291 | $ 52,904 |