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Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value Measurements, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Assets measured at fair value on recurring basis $ 13,218 $ 12,386
Cash Equivalents | Fair Value Measurements, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Assets measured at fair value on recurring basis 13,218 12,166
Marketable Securities | Fair Value Measurements, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Assets measured at fair value on recurring basis   220
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Assets measured at fair value on recurring basis 13,218 12,386
Carrying Amount | Cash Equivalents    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Assets measured at fair value on recurring basis $ 13,218 12,166
Carrying Amount | Marketable Securities    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Assets measured at fair value on recurring basis   $ 220