Summary of Significant Accounting Policies (Property and Equipment) (Details)	12 Months Ended
	Dec. 31, 2012
Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	5 years
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	7 years
Software And Website Development Costs [Member]
Property, Plant and Equipment [Line Items]
Amortized useful life (in years)	3 years