Convertible Preferred Stock (Tables)

9 Months Ended

Sep. 30, 2012

Convertible Preferred Stock [Abstract]

The authorized, issued, and outstanding shares of convertible preferred stock

The authorized, issued, and outstanding shares of convertible preferred stock at December 31, 2011 were as follows:

Series	Authorized Shares		Shares Issued and Outstanding		Aggregate Liquidation Preference
					(in thousands)
Series A convertible preferred stock		5,000,000		5,000,000	$	5,000
Series B convertible preferred stock		24,390,790		24,071,790		62,586
Series C convertible preferred stock		5,048,469		5,048,469		17,670
Series D convertible preferred stock		7,750,655		7,750,655		29,840
Series E convertible preferred stock		6,800,000		6,793,478		50,000
		48,989,914		48,664,392	$	165,096