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Fair-Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total $ 27,327 $ 37,577
Restricted Cash, Noncurrent    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Money-market funds, fair value disclosure 10,679 10,679
Short-term Investments    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Money-market funds, fair value disclosure 16,648 26,898
Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total 27,327 37,577
Fair Value, Inputs, Level 1 | Restricted Cash, Noncurrent    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Money-market funds, fair value disclosure 10,679 10,679
Fair Value, Inputs, Level 1 | Short-term Investments    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Money-market funds, fair value disclosure 16,648 26,898
Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total 0 0
Fair Value, Inputs, Level 2 | Restricted Cash, Noncurrent    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Money-market funds, fair value disclosure 0 0
Fair Value, Inputs, Level 2 | Short-term Investments    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Money-market funds, fair value disclosure 0 0
Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total 0 0
Fair Value, Inputs, Level 3 | Restricted Cash, Noncurrent    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Money-market funds, fair value disclosure 0 0
Fair Value, Inputs, Level 3 | Short-term Investments    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Money-market funds, fair value disclosure $ 0 $ 0