Deferred Revenue (Schedule Of Deferred Revenue) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 9,255,674	$ 8,010,834
Less: Long-term deferred revenue	(441,583)	(491,080)
Total current deferred revenue	8,814,091	7,519,754
Product Shipped, Revenue Deferred [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	1,265,537	1,368,007
Customer Deposits [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	1,101,638	421,544
Deferred Service And License Fees [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 6,888,499	$ 6,221,283