Deferred Revenue (Schedule Of Deferred Revenue) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 7,692,478	$ 9,980,098
Less: Long-term deferred revenue	(293,047)	(477,159)
Total current deferred revenue	7,399,431	9,502,939
Product Shipped, Revenue Deferred [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	1,570,771	3,206,641
Customer Deposits [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	420,723	558,227
Deferred Service And License Fees [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 5,700,984	$ 6,215,230