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Summary of Significant Accounting Policies - Accounts Receivable and Concentration of Credit Risk (Details)
12 Months Ended
Dec. 31, 2013
customer
Dec. 31, 2012
customer
Accounting Policies [Abstract]    
Accounts receivable, number of major customers (customers) 2 2
Accounts receivable, major customer (percentage) 23.00% 46.00%
Revenue, number of major customer (customers) 1 0
Revenue, major customer (percentage) 12.00%