Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Significant Accounting Policies [Line Items]
Entity Incorporation Date Of Incorporation	Jan. 11, 1991
Concentration risk, customer	two customers each accounted for 10% or more of the Companys revenues	two customers each accounted for 10% or more of the Companys revenues
Aggregate percentage of revenue the from customers accounted for more than 10%	25.00%	23.00%
Deferred tax asset	$ 6,428,000	$ 5,570,000
Operating loss carryforwards, limitations on use	Approximately $8,000,000 of the Companys $16,000,000 of NOLs are subject to annual limitations of $1,300,000
Options and warrants excluded from the calculation of diluted shares	4,449,624	3,760,161
Production and importation permission description	22 million pounds in 2015 and reduce by approximately 4.5 million pounds each year and end at zero in 2020
Lower Of Cost Or Market Adjustment Amount		14,700,000
Customer
Significant Accounting Policies [Line Items]
Accounts receivable, net	$ 688,000	$ 344,000