Property And Equipment (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 11,420,800	$ 11,120,416
Less: Accumulated depreciation	(10,334,556)	(10,053,095)
Net property and equipment	1,086,244	1,067,321
Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	8,397,528	8,496,636
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	$ 2,719,860	$ 2,320,368