Annual report pursuant to section 13 and 15(d)

Records of Allowance for Doubtful Accounts (Detail)

v2.4.0.6
Records of Allowance for Doubtful Accounts (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for doubtful accounts at January 1, $ 52,912 $ 35,899
Additions 17,219 18,521
Write-offs (13,200) (1,508)
Allowance for doubtful accounts at December 31, $ 56,931 $ 52,912