Deferred Revenue (Schedule Of Deferred Revenue) (Details) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 7,199,306	$ 7,634,335
Less: Long-term deferred revenue	(856,854)	(976,165)
Total current deferred revenue	6,342,452	6,658,170
Product Shipped, Revenue Deferred [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	210,360	457,348
Customer Deposits [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	41,779	1,065,371
Deferred Service And License Fees [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 6,947,167	$ 6,111,616