Summary of Significant Accounting Policies (Details) (Credit Concentration Risk)	12 Months Ended
	Dec. 31, 2013 customer	Dec. 31, 2012 customer
Sales Revenue
Concentration Risk [Line Items]
Number of customers	5	5,000
Concentration risk (as a percent)	51.30%	48.30%
Accounts Receivable
Concentration Risk [Line Items]
Concentration risk (as a percent)	42.30%	57.70%