Significant Agreements - Additional Information (Detail) (USD $)	1 Months Ended							3 Months Ended		6 Months Ended		12 Months Ended		1 Months Ended			1 Months Ended		1 Months Ended		6 Months Ended
	Sep. 30, 2013 Boe	May 31, 2013 Boe	Mar. 31, 2013 Boe	Sep. 30, 2012 Boe	Sep. 30, 2011 Boe	Aug. 31, 2011	Mar. 31, 2010	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Installment	Jun. 30, 2013	Dec. 31, 2009	Dec. 31, 2013	Jul. 31, 2011 Sasol	Jun. 30, 2014 Sasol	Jun. 30, 2014 Lanxess	Aug. 31, 2011 Mansfield	Jun. 30, 2014 Mansfield	Aug. 31, 2011 C And N	Jun. 30, 2014 C And N	Jun. 30, 2014 Ethanol Marketing Agreement with Subsidiary of Mansfield Oil Company	Jun. 30, 2014 Development and Commercialization Agreements with ICM Inc	Jun. 30, 2014 Cargill License Agreement
Parties To Contract [Line Items]
Agreement term														3 years			5 years		3 years
Amount recorded for resale agreement															$ 0
Amount recorded for supply agreement																0		0		0
Terms of agreement																					The ethanol purchase and marketing agreement with C&N was entered into on April 1, 2009 and automatically renews for subsequent one-year terms unless either party terminates the agreement 60 days before the end of a term.	In December 2011, the development agreement was amended to extend the term indefinitely. The development agreement, as amended, may be cancelled by either party with 30 days’ prior written notice.	The Company may terminate the license agreement at any time upon 90 days’ prior written notice. Unless terminated earlier, the license agreement remains in effect until the later of December 31, 2025 and the date that no licensed patent rights remain.
Production, barrels of oil Equivalents	20,000	12,500	3,650	45,000	11,000
Revenue from contract								400,000	300,000	800,000	700,000
Commercialization Agreement Period						2018-10
Revenue recognized under agreement								0	300,000	0	600,000
Milestone payment										5
Royalty expense							2,000,000			4,300,000		900,000
Present value of license fee							1,600,000
Royalty fee payable										1,000,000
Royalty fee payable, due date										2015-12
License fees								500,000		500,000
Common stock shares issued			250,000					69,104,005		69,104,005			69,104,005
Amount received for pilot plant								1,000,000		1,000,000
Amount refund from pilot plant								1,000,000		1,000,000
Refund amount as component of other long term liabilities								$ 1,000,000		$ 1,000,000