Property And Equipment (Schedule Of Property And Equipment) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Gross property and equipment	$ 11,303,416	$ 11,393,834
Less: Accumulated depreciation	(9,884,096)	(9,251,911)
Net property and equipment	1,419,320	2,141,923
Equipment [Member]
Gross property and equipment	8,671,623	8,762,041
Equipment Held For Lease [Member]
Gross property and equipment	303,412	303,412
Leasehold Improvements [Member]
Gross property and equipment	$ 2,328,381	$ 2,328,381