Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2013

Convertible Preferred Stock

Convertible Preferred Stock (in thousands, except share amounts)

	December 31, 2013		December 31, 2012
Preferred stock, $0.01 par value; 61,617,516 total shares authorized at December 31, 2013 and December 31, 2012:
Series A convertible preferred stock, 17,006,275 shares designated at December 31, 2013 and December 31, 2012; 16,525,086 and 16,317,747 shares issued and outstanding at December 31, 2013 and December 31, 2012; aggregate liquidation preference of $17,599 and $17,371 at December 31, 2013 and December 31, 2012.	$	17,402	$	17,181
Series B convertible preferred stock, 16,410,526 shares designated at December 31, 2013 and December 31, 2012; 16,394,324 shares issued and outstanding at December 31, 2013 and December 31, 2012; aggregate liquidation preference of $12,167 at December 31, 2013 and December 31, 2012.		12,164		12,164
Series C convertible preferred stock, 15,621,609 shares designated at December 31, 2013 and December 31, 2012; 15,621,609 shares issued and outstanding at December 31, 2013 and December 31, 2012; aggregate liquidation preference of $24,490 at December 31, 2013 and December 31, 2012.		24,388		24,388
Series D convertible preferred stock, 9,007,678 shares designated at December 31, 2013 and December 31, 2012; 9,007,678 shares issued and outstanding at December 31, 2013 and December 31, 2012; aggregate liquidation preference of $32,044 at December 31, 2013 and December 31, 2012.		31,943		31,943
Series E convertible preferred stock, 3,571,428 shares designated at December 31, 2013 and December 31, 2012; 2,500,000 shares issued and outstanding at December 31, 2013 and December 31, 2012; aggregate liquidation preference of $17,500 at December 31, 2013 and December 31, 2012.		17,347		17,347
	$	103,244	$	103,023

Shares of Common Stock Authorized and Reserved for Future Issuance

As of December 31, 2013, we have shares of common stock authorized and reserved for future issuance as follows:

Options to purchase common stock	10,828,682
Options available for future issuance	1,939,123
Convertible preferred Series A stock warrants	408,940
Common stock warrants	195,235
Total common stock authorized and reserved for future issuance	13,371,980