5. Property and Equipment, net (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment - at cost	$ 586,113us-gaap_PropertyPlantAndEquipmentGross	$ 1,366,935us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation	(466,664)	(1,214,332)
Property and equipment - net	119,449us-gaap_PropertyPlantAndEquipmentNet	152,603us-gaap_PropertyPlantAndEquipmentNet
Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment - at cost	254,150	1,106,761
Office and Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment - at cost	189,459	137,974
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment - at cost	92,354	69,296
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment - at cost	$ 50,150	$ 52,904