Annual report pursuant to Section 13 and 15(d)

Components of Accrued Liabilities (Detail)

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Components of Accrued Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accrued Liabilities [Line Items]    
Accrued compensation $ 2,549 $ 1,890
Other accrued liabilities 1,426 1,306
Accrued liabilities $ 3,975 $ 3,196