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Property and Equipment, net - Schedule 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 - at cost | $ 1,366,935 | $ 1,258,441 |
| Less accumulated depreciation | (1,214,332) | (1,136,359) |
| Property and equipment - net | 152,603 | 122,082 |
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Laboratory Equipment [Member]
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| Property, Plant and Equipment [Line Items] | ||
| Property and equipment - at cost | 1,106,761 | 1,028,417 |
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Office and Computer Equipment [Member]
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| Property, Plant and Equipment [Line Items] | ||
| Property and equipment - at cost | 190,878 | 162,111 |
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Leasehold Improvements [Member]
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| Property, Plant and Equipment [Line Items] | ||
| Property and equipment - at cost | $ 69,296 | $ 67,913 |
| X | ||||||||||
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- Definition
Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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