Preferred Stock (Tables)

9 Months Ended

Sep. 30, 2013

Convertible Preferred Stock

The following table provides details regarding each Series of preferred stock authorized by the Board of Directors.

	September 30, 2013		December 31, 2012
Preferred stock, $0.01 par value; 61,617,516 total shares authorized at September 30, 2013 and December 31, 2012:
Series A convertible preferred stock, 17,006,275 shares designated at September 30, 2013 and December 31, 2012; 16,501,612 and 16,317,747 shares issued and outstanding at September 30, 2013 and December 31, 2012; aggregate liquidation preference of $17,574 and $17,371 at September 30, 2013 and December 31, 2012.	$	17,376	$	17,181
Series B convertible preferred stock, 16,410,526 shares designated at September 30, 2013 and December 31, 2012; 16,394,325 and 16,394,324 shares issued and outstanding at September 30, 2013 and December 31, 2012 ; aggregate liquidation preference of $12,280 and $12,167 at September 30, 2013 and December 31, 2012.		12,165		12,164
Series C convertible preferred stock, 15,621,609 shares designated at September 30, 2013 and December 31, 2012; 15,621,609 shares issued and outstanding at September 30, 2013 and December 31, 2012, aggregate liquidation preference of $24,490 at September 30, 2013 and December 31, 2012.		24,388		24,388
Series D convertible preferred stock, 9,007,678 shares designated at September 30, 2013 and December 31, 2012; 9,007,678 shares issued and outstanding at September 30, 2013 and December 31, 2012; aggregate liquidation preference of $32,044 at September 30, 2013 and December 31, 2012.		31,943		31,943
Series E convertible preferred stock, 3,571,428 shares designated at September 30, 2013 and December 31, 2012; 2,500,000 shares issued and outstanding at September 30, 2013 and December 31, 2012; aggregate liquidation preference of $17,500 at September 30, 2013 and December 31, 2012.		17,347		17,347
	$	103,219	$	103,023