CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jun. 30, 2012	Dec. 31, 2011
CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowance (in dollars)	$ 547,184	$ 579,143
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	46,254,579	45,270,768
Common stock, shares outstanding	46,071,284	45,129,407
Treasury stock, shares	183,295	141,361