Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accrued Liabilities [Line Items]
Accrued interest	$ 67	$ 65
Accrued franchise and other taxes	338	484
Accrued compensation	200	190
Other accrued expenses	139	164
Total	$ 744	$ 903	[1]

[1] Derived from audited information