Number of shares issued during the period as a result of the conversion of convertible securities.

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Amount to be paid per share that is classified as temporary equity by entity upon redemption. 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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- Definition

The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. 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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Summary of Significant Accounting Policies (Details 3)			12 Months Ended	0 Months Ended						0 Months Ended
Summary of Significant Accounting Policies (Details 3)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2014 Common Stock	Aug. 26, 2014 Air Liquide Series C redeemable convertible preferred stock	May 08, 2013 Air Liquide Series C redeemable convertible preferred stock USD ($)	May 08, 2013 Air Liquide Series C redeemable convertible preferred stock EUR (€)	Dec. 31, 2014 Air Liquide Series C redeemable convertible preferred stock	Aug. 26, 2014 Air Liquide Series C redeemable convertible preferred stock USD ($)	May 08, 2013 Air Liquide Series C redeemable convertible preferred stock USD ($)	Aug. 26, 2014 Air Liquide Series C redeemable convertible preferred stock Common Stock
Redeemable preferred stock
Redeemable stock issued (in shares)	5,231us-gaap_TemporaryEquitySharesIssued	10,431us-gaap_TemporaryEquitySharesIssued					5,231		10,431
Redeemable stock issued, par value (in dollars per share)	$ 0.01	$ 0.01							$ 0.01
Aggregate purchase price of shares issued					$ 2,595,400	€ 2,000,000
Shares issued upon conversion of redeemable stock (in shares)			5,521,676	(5,200)						5,521,676
Conversion price per share (in dollars per share)								$ 0.2343