Common Stock (Tables)

6 Months Ended

Jun. 30, 2012

Common Stock

Schedule of shares reserved for future issuance

(in thousands)	December 31, 2011	June 30, 2012
Conversion of Series B, Series C, Series D, Series E, Series F and Series G convertible preferred stock	66,256	—
Convertible preferred stock warrants	302	—
Common stock warrants	2,640	2,905
Equity compensation plans	17,617	17,455
	86,815	20,360