Preferred Stock (Tables)

6 Months Ended

Jun. 30, 2013

Convertible Preferred Stock

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

	June 30, 2013		December 31, 2012
Preferred stock, $0.01 par value; 61,617,516 total shares authorized at June 30, 2013 and December 31, 2012:
Series A convertible preferred stock, 17,006,275 shares designated at June 30, 2013 and December 31, 2012; 16,470,322 and 16,317,747 shares issued and outstanding at June 30, 2013 and December 31, 2012; aggregate liquidation preference of $17,541 and $17,398 at June 30, 2013 and December 31, 2012.	$	17,343	$	17,181
Series B convertible preferred stock, 16,410,526 shares designated at June 30, 2013 and December 31, 2012; 16,410,526 shares issued and outstanding at June 30,2013 and December 31, 2012; aggregate liquidation preference of $12,280 at June 30, 2013 and December 31, 2012.		12,165		12,164
Series C convertible preferred stock, 15,621,609 shares designated at June 30, 2013 and December 31, 2012; 15,621,609 shares issued and outstanding at June 30, 2013 and December 31, 2012, aggregate liquidation preference of $24,490 at June 30, 2013 and December 31, 2012.		24,388		24,388
Series D convertible preferred stock, 9,007,678 shares designated at June 30, 2013 and December 31, 2012; 9,007,678 shares issued and outstanding at June 30, 2013 and December 31, 2012; aggregate liquidation preference of $32,044 at June 30, 2013 and December 31, 2012.		31,943		31,943
Series E convertible preferred stock, 3,571,428 shares designated at June 30, 2013 and December 31, 2012; 2,500,000 shares issued and outstanding at June 30, 2013 and December 31, 2012; aggregate liquidation preference of $17,500 at June 30, 2013 and December 31, 2012.		17,347		17,347
	$	103,186	$	103,023