Deferred Revenue (Schedule Of Deferred Revenue) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 9,980,098	$ 8,855,019
Less: Long-term deferred revenue	(477,159)	(634,713)
Total current deferred revenue	9,502,939	8,220,306
Product Shipped, Revenue Deferred [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	3,206,641	2,001,160
Customer Deposits [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	558,227	1,156,900
Deferred Service And License Fees [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 6,215,230	$ 5,696,959