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Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on a Recurring Basis (Detail) - Fair Value Measurements Recurring [Member]
$ in Thousands
Jun. 30, 2016
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Assets fair value disclosure $ 17,028
Money Market Funds [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Assets fair value disclosure 5,626
U.S. Government Treasury Bills [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Assets fair value disclosure 2,407
Corporate Bonds and Commercial Paper [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Assets fair value disclosure 8,995
Level 1 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Assets fair value disclosure 5,626
Level 1 [Member] | Money Market Funds [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Assets fair value disclosure 5,626
Level 2 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Assets fair value disclosure 11,402
Level 2 [Member] | U.S. Government Treasury Bills [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Assets fair value disclosure 2,407
Level 2 [Member] | Corporate Bonds and Commercial Paper [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Assets fair value disclosure $ 8,995