Property and Equipment Estimated Useful Lives (Details)	6 Months Ended
	Jun. 30, 2013
Machinery and equipment | Minimum
Estimated Useful Lives	4 years
Machinery and equipment | Maximum
Estimated Useful Lives	6 years
Electronic equipment | Minimum
Estimated Useful Lives	4 years
Electronic equipment | Maximum
Estimated Useful Lives	6 years
Transportation equipment | Minimum
Estimated Useful Lives	4 years
Transportation equipment | Maximum
Estimated Useful Lives	6 years
Leasehold improvements | Minimum
Estimated Useful Lives	5 years
Leasehold improvements | Maximum
Estimated Useful Lives	5 years
Computer equipment | Minimum
Estimated Useful Lives	4 years
Computer equipment | Maximum
Estimated Useful Lives	6 years
Office equipment | Minimum
Estimated Useful Lives	4 years
Office equipment | Maximum
Estimated Useful Lives	6 years