4. Inventories (Detail) - (Table 1) Inventory Components (USD $)	Dec. 31, 2012	Dec. 31, 2011
Raw materials	$ 659,149	$ 468,053
Finished goods	334,026	100,566
Offsite demo equipment	96,566	183,256
Less inventory reserve	(163,505)	(22,000)
	$ 926,236	$ 729,875