Fixed Assets (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Fixed Assets [Line Items]
Fixed assets, gross	$ 3,180,495		$ 4,510,847
Less - accumulated depreciation	(2,951,182)		(4,216,950)
Fixed assets, net	229,313		293,897
Computer and laboratory equipment
Fixed Assets [Line Items]
Fixed assets, estimated useful life	3 years
Fixed assets, gross	1,748,566		2,689,519
Furniture and equipment
Fixed Assets [Line Items]
Fixed assets, estimated useful life	3 years
Fixed assets, gross	249,377		644,034
Production equipment
Fixed Assets [Line Items]
Fixed assets, estimated useful life	7 years
Fixed assets, gross	997,297		997,297
Leasehold improvements
Fixed Assets [Line Items]
Fixed assets, estimated useful life		[1]
Fixed assets, gross	$ 185,255		$ 179,997

[1] Lesser of life of lease or estimated useful life.