Summary of significant accounting policies - Additional Information (Detail)	3 Months Ended		9 Months Ended					9 Months Ended
	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Dec. 31, 2012 USD ($)	Sep. 30, 2013 Customer USD ($)	Sep. 30, 2012 Customer USD ($)	Sep. 30, 2014 Subsequent Event GBP (£)	Sep. 30, 2013 Subsequent Event GBP (£)
Significant Accounting Policies [Line Items]
Entity Incorporation Date Of Incorporation			Jan. 11, 1991
Number of customer accounted for approximately 10% or more of total revenues			2	3
Aggregate percentage of revenue the from customers accounted for more then 10%			25.00%	40.00%
Deferred tax asset	$ 4,941,000		$ 4,941,000		$ 3,888,000
Operating loss carryforwards, limitations on use			Approximately $10,600,000 of the Companys $13,000,000 of NOLs are subject to annual limitations of $1,300,000.
Options and warrants excluded from the calculation of diluted shares	3,746,807	0	3,746,807	0
Production and importation permission from government agency, amount								51,000,000	63,000,000
Accounts receivable, net						622,000	3,300,000
Lower of cost or market adjustment	14,700,000	0	14,700,000	0
Income Taxes Receivable, Current	$ 3,300,000		$ 3,300,000