Property and Equipment (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Property, Plant, and Equipment Disclosure [Line Items]
Property, plant and equipment, gross	$ 2,759,551	$ 2,222,837
Less: accumulated depreciation	(1,494,510)	(1,193,601)
Property and equipment, net	1,265,041	1,029,236
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	121,129	99,603
Office Furniture And Equipment
Property, Plant, and Equipment Disclosure [Line Items]
Property, plant and equipment, gross	274,438	251,170
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	149,867	96,097
Laboratory Equipment
Property, Plant, and Equipment Disclosure [Line Items]
Property, plant and equipment, useful life	7 years
Property, plant and equipment, gross	1,020,158	994,994
Leasehold Improvements
Property, Plant, and Equipment Disclosure [Line Items]
Property, plant and equipment, useful life	10 years
Property, plant and equipment, gross	622,772	603,445
Manufacturing Equipment
Property, Plant, and Equipment Disclosure [Line Items]
Property, plant and equipment, useful life	7 years
Property, plant and equipment, gross	$ 571,187	$ 177,528