Accounts Payable and Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounts Payable and Accrued Liabilities [Line Items]
Trade accounts payable	$ 1,095	$ 1,127
Accrued royalties	87	87
Accrued interest	246	154
Sales taxes payable	87	78
Accrued compensation	60	80
Other accrued expenses	26	108
Total	$ 1,601	$ 1,634