Property And Equipment (Schedule Of Property And Equipment) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 10,774,793	$ 11,393,834
Less: Accumulated depreciation	(9,590,204)	(9,251,911)
Net property and equipment	1,184,589	2,141,923
Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	8,143,000	8,762,041
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