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Property and Equipment, net - Schedule of Property and Equipment, Net (Detail) (USD $)
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Jun. 30, 2014
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Dec. 31, 2013
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|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment - at cost | $ 592,239 | $ 1,366,935 |
| Less accumulated depreciation | (435,926) | (1,214,332) |
| Property and equipment - net | 156,313 | 152,603 |
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Laboratory Equipment [Member]
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| Property, Plant and Equipment [Line Items] | ||
| Property and equipment - at cost | 239,027 | 1,106,761 |
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Office and Computer Equipment [Member]
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||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment - at cost | 254,494 | 190,878 |
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Leasehold Improvements [Member]
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| Property, Plant and Equipment [Line Items] | ||
| Property and equipment - at cost | $ 98,718 | $ 69,296 |