STATEMENT OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2011
STATEMENT OF STOCKHOLDERS' EQUITY
Exercise of options to purchase common stock, per share, low end of range	$ 0.40
Exercise of options to purchase common stock, per share, high end of range	$ 7.74
Share-based payment-director services, per share	$ 7.13