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Accrued Liabilities - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accrued Liabilities [Line Items]    
Severance and termination benefit $ 3,896 $ 3,323
Severance and Termination Benefit    
Accrued Liabilities [Line Items]    
Severance and termination benefit $ 1,700 $ 1,700