CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowance	$ 525,556	$ 579,588
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	46,259,009	45,270,768
Common stock, shares outstanding	46,063,822	45,129,407
Treasury stock, shares	195,187	141,361