Property And Equipment (Schedule Of Property And Equipment) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 10,815,933	$ 10,774,793
Less: Accumulated depreciation	(9,827,701)	(9,590,204)
Net property and equipment	988,232	1,184,589
Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	8,184,140	8,143,000
Equipment Held For Lease [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	303,412	303,412
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 2,328,381	$ 2,328,381