Inventories (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Inventories
Purchased materials	$ 1,013,492	$ 1,369,041
Finished goods	1,561,043	1,596,877
Inventory obsolescence reserve	(451,156)	(257,837)
Inventories, net	$ 2,123,379	$ 2,708,081