Property and Equipment (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Property, Plant, and Equipment Disclosure [Line Items]
Property, plant and equipment, gross	$ 3,013,501	$ 2,759,551
Less: accumulated depreciation	(1,718,477)	(1,494,510)
Property and equipment, net	1,295,024	1,265,041
Minimum
Property, Plant, and Equipment Disclosure [Line Items]
Property, plant and equipment, useful life	3 years
Maximum
Property, Plant, and Equipment Disclosure [Line Items]
Property, plant and equipment, useful life	10 years
Computer Equipment
Property, Plant, and Equipment Disclosure [Line Items]
Property, plant and equipment, useful life	3 years
Property, plant and equipment, gross	121,921	121,129
Office Furniture And Equipment
Property, Plant, and Equipment Disclosure [Line Items]
Property, plant and equipment, gross	245,297	274,438
Office Furniture And Equipment | Minimum
Property, Plant, and Equipment Disclosure [Line Items]
Property, plant and equipment, useful life	5 years
Office Furniture And Equipment | Maximum
Property, Plant, and Equipment Disclosure [Line Items]
Property, plant and equipment, useful life	7 years
Software
Property, Plant, and Equipment Disclosure [Line Items]
Property, plant and equipment, useful life	3 years
Property, plant and equipment, gross	121,378	149,867
Laboratory Equipment
Property, Plant, and Equipment Disclosure [Line Items]
Property, plant and equipment, useful life	7 years
Property, plant and equipment, gross	1,270,858	1,020,158
Leasehold Improvements
Property, Plant, and Equipment Disclosure [Line Items]
Property, plant and equipment, useful life	10 years
Property, plant and equipment, gross	665,158	622,772
Manufacturing Equipment
Property, Plant, and Equipment Disclosure [Line Items]
Property, plant and equipment, useful life	7 years
Property, plant and equipment, gross	$ 588,889	$ 571,187