Background and Basis of Presentation - Additional Information (Detail) (USD $)	0 Months Ended							0 Months Ended
	Nov. 06, 2012	Mar. 31, 2013 lb	Mar. 31, 2013 psi	Dec. 31, 2012	Oct. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Jan. 24, 2013 January 2013 Bridge Notes	Mar. 31, 2013 Maximum	Dec. 28, 2012 Maximum	Mar. 31, 2013 Equipment [Member]	Nov. 06, 2012 Equipment [Member]
Basis of Presentation [Line Items]
Hydrogen refueling systems, maximum storage capacity (in Psi)		10,000	10,000
Sale Leaseback Transaction, Gross Proceeds	$ 3,250,000
Gross sale lease back amount	3,250,000										631,582	2,103,530
Amount in escrow account			1,146,470	1,146,470
Aggregate Offering Price of Sale of Common Stock per Agreement									1,332,251	5,000,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights								1,500,000
Face amount of debt								1,800,000
Net proceeds from issuance of long-term debt								1,362,500
Cash and cash equivalents			1,549,302	2,013,738		10,710,970	3,798,181
Common stock that we can offer and sell under the remaining amount of our ATM arrangement					3,592,394
Amount held in escrow for future equipment purchases			$ 1,146,470