Property And Equipment (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 11,252,389	$ 11,420,800
Less: Accumulated depreciation	(10,317,294)	(10,334,556)
Net property and equipment	935,095	1,086,244
Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	8,234,491	8,397,528
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	$ 2,714,486	$ 2,719,860