Nature of Operations (Liquidity Narrative) (Details) (USD $)	1 Months Ended			9 Months Ended
	Sep. 16, 2013	Mar. 27, 2013	Feb. 28, 2013	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	May 08, 2013 Air Liquide Investissements d'Avenir et de Demonstration ("Air Liquide")	Dec. 31, 2012 Silicon Valley Bank [Member]
Line of Credit Facility [Line Items]
Borrowing capacity under SVB loan facility								$ 15,000,000
Outstanding amount under loan agreement								3,400,000
Proceeds from issuance of public offerings	10,600,000		2,300,000
Strategic Investment From Joint Venture							6,500,000
Proceeds from exercise of warrants				2,849,460
Sale-leaseback transaction in real estate in Latham, NY		2,600,000
Total liabilities				$ 35,364,066		$ 24,429,699