Stockholders' Equity (Detail Textuals 1) (USD $)	6 Months Ended			0 Months Ended		1 Months Ended				0 Months Ended	1 Months Ended		1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	May 08, 2013	May 16, 2013 Series C Redeemable Convertible Preferred Stock	Jun. 08, 2011 Underwritten Public Offering 2011	Jul. 01, 2011 Underwritten Public Offering 2011	May 31, 2011 Underwritten Public Offering 2011 Portion	Jun. 30, 2012 Underwritten Public Offering 2011 Warrant	May 31, 2011 Underwritten Public Offering 2011 Warrant	May 08, 2013 Underwritten Public Offering 2011 Warrant Air Liquide Investissements d'Avenir et de Demonstration ("Air Liquide") Series C Redeemable Convertible Preferred Stock	Feb. 21, 2013 Underwritten Public Offering 2013	Feb. 20, 2013 Underwritten Public Offering 2013	Feb. 20, 2013 Underwritten Public Offering 2013 Warrant	Jun. 30, 2013 Underwritten Public Offering 2013 Warrant
Public Offering [Line Items]
Underwritten public offering of common stock and warrants					836,750	231,000	8,265,000				2,801,800		18,910,000
Number of warrants called to purchase shares of common stock							7,128,563	9,421,008		20,762,805		1,891,000	18,910,000	18,925,389
Number of shares of common stock purchased by the underwriter							929,813						2,836,500
Net Proceeds, after underwriting discounts and commissions and other fees payable					$ 1,874,990	$ 527,626	$ 18,289,883				$ 364,794		$ 1,948,766
Portion of warrants in the share and warrant combination							0.75
Fair value recorded of common stock warranty liability							$ 8,768,143
Price to public, per share and warrant combination							$ 2.42					$ 0.15
Exercise price of the warrants on issuance of common stock			0.15					2.27	3.00	1.03		0.18	0.15	1.13
Number of anti-dilutive Series C redeemable convertible preferred stock	38,335,369	11,701,927		10,431						20,762,805