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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 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 (328,969) (24,107) (371,308) (77,743)
Account write-offs and other     (25,134) (111,721)
Allowance for doubtful accounts, end of period $ 1,520,632 $ 1,101,413 $ 1,520,632 $ 1,101,413