Convertible Preferred Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended		1 Months Ended
Sep. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Series C convertible preferred stock item	May 31, 2013 Series C convertible preferred stock
Convertible preferred stock
Number of authorized shares	60,187,700	59,147,999	14,852,001	14,000,000
Number of shares that may be sold in additional closings			1,640,212	26,455
Number of additional closings			2
Gross proceeds from issuance of shares	$ 12,945		$ 13,000
Number of shares issued			6,904,761

- Definition

The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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