Convertible Preferred Stock

9 Months Ended

Sep. 30, 2012

Convertible Preferred Stock [Abstract]

Convertible Preferred Stock

5. 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

Conversion

In connection with the completion of the Company’s IPO in February 2012, all convertible preferred stock converted into 24,332,186 shares of common stock.

Warrants to Purchase Convertible Preferred Stock

Series B Convertible Preferred Stock

In February 2012, in connection with the IPO, all outstanding warrants to purchase Series B convertible preferred stock converted into warrants to purchase 159,500 shares of common stock at $5.20 per share, expiring in 2012 through 2014.