Deferred Revenue

9 Months Ended

Sep. 30, 2013

Deferred Revenue [Abstract]

Deferred Revenue

8. Deferred Revenue

Deferred revenue consists of the following:

	September 30,	December 31,
	2013	2012
Product shipped, revenue deferred	$      1,570,771	$      3,206,641
Customer deposits	420,723	558,227
Deferred service and license fees	5,700,984	6,215,230
	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