Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
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
Deferred tax asset		$ 1.9		$ 1.9		$ 2.5
Operating loss carryforwards, limitations on use				All the Companys remaining NOLs of approximately $4.1 million are subject to annual limitations of $1.3 million
Options and warrants excluded from the calculation of diluted shares		0	73,034	0	123,034
Production and importation permission description				22 million pounds in 2015 and reduces by approximately 4.5 million pounds each year and ends at zero in 2020
Production Phase Down Percentage	85.00%
Selling and Marketing Expense [Member]
Significant Accounting Policies [Line Items]
Prior Period Reclassification Adjustment			$ 0.9		$ 3.0
General and Administrative Expense [Member]
Significant Accounting Policies [Line Items]
Prior Period Reclassification Adjustment			$ 3.1		$ 5.8
Sales Revenue, Net [Member]
Significant Accounting Policies [Line Items]
Aggregate percentage of revenue the from customers accounted for more than 10%				37.00%	33.00%
Customer
Significant Accounting Policies [Line Items]
Accounts receivable, net		$ 4.3		$ 4.3