Deferred Revenue (Schedule Of Deferred Revenue) (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 8,711,471	$ 9,980,098
Less: Long-term deferred revenue	(334,664)	(477,159)
Total current deferred revenue	8,376,807	9,502,939
Product Shipped, Revenue Deferred [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	1,862,362	3,206,641
Customer Deposits [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	418,787	558,227
Deferred Service And License Fees [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 6,430,322	$ 6,215,230