Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Feb. 28, 2009
Schedule of Accrued Liabilities [Line Items]
Legal and accounting fees	$ 109	$ 69
Accrued compensation	42	385	1,000
Severance agreement (Note 11)	1,000	1,000
Other	10	97
Total	$ 1,161	$ 1,551