Deferred Revenue

3 Months Ended

Mar. 31, 2014

Deferred Revenue [Abstract]

Deferred Revenue

8. Deferred Revenue

Deferred revenue consists of the following:

	March 31,	December 31,
	2014	2013
Product shipped, revenue deferred	$      1,265,537	$      1,368,007
Customer deposits	1,101,638	421,544
Deferred service and license fees	6,888,499	6,221,283
	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