Convertible Preferred Stock and Stockholders' Deficit (Tables)

12 Months Ended

Dec. 31, 2012

Reserved Shares of Common Stock

As of December 31, 2011 and 2012, we had reserved shares of common stock, on an as-if-converted basis, for issuance as follows:

	December 31,
	2011		2012
Conversion of Series A convertible preferred stock		4,309,972		4,309,972
Conversion of Series B convertible preferred stock		3,579,597		3,579,597
Conversion of Series C convertible preferred stock		9,214,160		9,214,160
Conversion of Series D convertible preferred stock		6,287,026		6,287,026
Conversion of Series 1 convertible preferred stock		636,042		636,042
Options issued and outstanding		3,104,399		3,451,178
Options available for grant under stock option plan		45,259		593,011
Common and convertible preferred stock warrants		82,575		82,575
Total		27,259,030		28,153,561

Outstanding Convertible Preferred Stock

As of December 31, 2011 and 2012, we had outstanding convertible preferred stock as follows (in thousands, except share data):

	Shares Authorized		Shares Issued and Outstanding		Carrying Value and Liquidation Preference
Series A		43,147,400		4,309,972	$	43,100
Series B		36,750,400		3,579,597		46,893
Series C		93,000,000		9,214,160		130,381
Series D		64,000,000		6,287,026		88,962
Series 1		6,360,500		636,042		7,944
Total		243,258,300		24,026,797	$	317,280