Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Accounts Receivable (Details)

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Summary of Significant Accounting Policies - Accounts Receivable (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Changes in the Allowance for Doubtful Accounts [Roll Forward]        
Allowance for doubtful accounts, beginning of period     $ 1,174,458 $ 1,135,391
Charges to costs and expenses (137,227) (6,024) (508,535) (83,767)
Account write-offs and other     (63,476) (124,634)
Allowance for doubtful accounts, end of period $ 1,619,517 $ 1,094,524 $ 1,619,517 $ 1,094,524