Property and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Summary of property and equipment
Total cost	$ 50,845,325	$ 51,314,231
Less: Accumulated depreciation	(28,893,124)	(24,469,011)
Property and equipment, net	21,952,201	26,845,220
Land [Member]
Summary of property and equipment
Total cost	2,899,962	2,899,962
Building [Member]
Summary of property and equipment
Total cost	13,862,194	13,998,874
Estimated Useful Life	39 years
Production equipment [Member]
Summary of property and equipment
Total cost	18,180,517	17,338,392
Production equipment [Member] | Maximum [Member]
Summary of property and equipment
Estimated Useful Life	7 years
Production equipment [Member] | Minimum [Member]
Summary of property and equipment
Estimated Useful Life	3 years
Computer equipment [Member]
Summary of property and equipment
Total cost	7,480,592	8,482,545
Computer equipment [Member] | Maximum [Member]
Summary of property and equipment
Estimated Useful Life	5 years
Computer equipment [Member] | Minimum [Member]
Summary of property and equipment
Estimated Useful Life	3 years
Furniture and office equipment [Member]
Summary of property and equipment
Total cost	3,358,778	3,076,331
Furniture and office equipment [Member] | Maximum [Member]
Summary of property and equipment
Estimated Useful Life	7 years
Furniture and office equipment [Member] | Minimum [Member]
Summary of property and equipment
Estimated Useful Life	5 years
Vehicles [Member]
Summary of property and equipment
Total cost	270,223	313,325
Estimated Useful Life	5 years
Website development costs [Member]
Summary of property and equipment
Total cost	600,949	600,949
Estimated Useful Life	3 years
Capitalized software development costs [Member]
Summary of property and equipment
Total cost	3,670,122	3,806,547
Estimated Useful Life	3 years
Construction-in-process [Member]
Summary of property and equipment
Total cost	$ 521,988	$ 797,306