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
Mar. 31, 2013
customer
Mar. 31, 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 42,339 53,636
Account write-offs and other 7,309 45,246
Allowance for doubtful accounts, end of period $ 1,224,106 $ 1,234,273
Accounts Receivable Additional Disclosures [Abstract]    
Number of major customer accounting for more than 10% of Company's total accounts receivable 0  
Number of major customers 0