Accounts Payable and Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts Payable and Accrued Liabilities [Line Items]
Trade accounts payable	$ 1,127	$ 1,307
Accrued royalties	87	87
Accrued interest	154	51
Sales taxes payable	78	66
Accrued compensation	80	13
Accrued professional fees	0	15
Other accrued expenses	108	106
Total	$ 1,634	$ 1,645