Significant Accounting Policies (Details 2)	12 Months Ended
	Dec. 31, 2012
Property, plant and equipment other than leasehold improvements | Minimum
Property and equipment
Useful life	3 years
Property, plant and equipment other than leasehold improvements | Maximum
Property and equipment
Useful life	5 years
Leasehold improvements | Minimum
Property and equipment
Useful life	3 years
Leasehold improvements | Maximum
Property and equipment
Useful life	15 years