Property, Plant and Equipment-Net - Additional Information (Detail) (USD $)	3 Months Ended		1 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	May 31, 2011 Manufacturing facility T l	May 31, 2011 Manufacturing facility Promissory note
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 1,126,000	$ 606,000
Fermenters production facility			128,000
Annual oil production capacity, in units			2,000,000
Annual oil production capacity, in metric tons			1,820
Purchase price of production facility			11,500,000
Proceeds received from sale of equipment			300,000
Amount borrowed				5,500,000
Fair value of assets allocated to plant equipment, building and improvements and land	$ 10,900,000