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Consolidated Balance Sheets (Parenthetical) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 4,483,089 $ 4,029,669
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000
Preferred stock, shares Issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 35,537,169 34,756,980
Common stock, shares outstanding (in shares) 35,537,169 34,756,980