Property and Equipment (Composition of Property and Equipment) (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Property, plant and equipment, gross	$ 2,004,000	$ 1,735,000
Less: accumulated depreciation and amortization	(932,000)	(604,000)
Property and equipment, net	1,072,000	1,131,000
Laboratory Equipment [Member]
Property, plant and equipment, gross	1,747,000	1,494,000
Office and Computer Equipment [Member]
Property, plant and equipment, gross	69,000	53,000
Leasehold Improvements [Member]
Property, plant and equipment, gross	$ 188,000	$ 188,000