Property, Plant and Equipment-Net - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	May 31, 2011 Manufacturing Facility [Member] t l	May 31, 2011 Manufacturing Facility [Member] Promissory note [Member]
Property, Plant and Equipment [Line Items]
Capitalization of interest costs associated with plant equipment	$ 0	$ 300,000	$ 0
Depreciation and amortization expense	5,108,000	3,519,000	1,707,000
Fermenters production facility				128,000
Annual oil production capacity, in liters				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