Capital Stock

9 Months Ended

Sep. 30, 2012

Capital Stock [Abstract]

Capital Stock

9. Capital Stock

Common stock

As of September 30, 2012 and December 31, 2011, 500,000,000 and 600,000,000 shares of common stock, respectively, were authorized under our certificate of incorporation.

As of September 30, 2012 and December 31, 2011, we had reserved shares of common stock for future issuance as follows:

	September 30, 2012		December 31, 2011
Shares reserved for convertible preferred stock		—		13,205,180
Shares reserved for stock options and restricted stock units		7,478,166		5,849,131
Shares reserved for employee stock purchase plan		451,764		—
Shares reserved for warrants		1,333		111,602