Deferred Revenue

6 Months Ended

Jun. 30, 2013

Deferred Revenue [Abstract]

Deferred Revenue

8. Deferred Revenue

Deferred revenue consists of the following:

	June 30,	December 31,
	2013	2012
Product shipped, revenue deferred	$      1,862,362	$      3,206,641
Customer deposits	418,787	558,227
Deferred service and license fees	6,430,322	6,215,230
	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