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Summary of Significant Accounting Policies - Accounts Receivable and Concentration of Credit Risk (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
customer
Sep. 30, 2011
customer
Sep. 30, 2012
customer
Sep. 30, 2011
customer
Dec. 31, 2011
customer
Accounting Policies [Abstract]          
Reserve for doubtful accounts $ 10,000   $ 10,000   $ 10,000
Number of major customers accounting for more than ten percent of accounts receivables (customers) 2   2   2
Percentage of accounts receivable accounted for by major customer (percentage) 26.00%   26.00%   32.00%
Number of major customers accounting for more than ten percent of revenues (customers) 0 1 0 1  
Percentage of revenues accounted for by major customers (percentage) 14.00%   14.00%