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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total financial assets $ 85,169 $ 10,004  
Total financial liabilities   2,123  
Redeemable Convertible Preferred Stock Tranche Liability [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total financial liabilities   1,643  
Redeemable Convertible Preferred Stock Warrant Liability [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total financial liabilities   480  
Corporate Bonds Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total financial assets 21,841 7,368  
Governmental Bonds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total financial assets 41,289    
Money Market Funds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total financial assets 11,270 2,136  
Commercial Paper [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total financial assets 10,769 500  
Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total financial assets 11,270 2,136  
Level 1 [Member] | Money Market Funds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total financial assets 11,270 2,136  
Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total financial assets 73,899 7,868  
Level 2 [Member] | Corporate Bonds Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total financial assets 21,841 7,368  
Level 2 [Member] | Governmental Bonds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total financial assets 41,289    
Level 2 [Member] | Commercial Paper [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total financial assets $ 10,769 500  
Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total financial liabilities   2,123  
Level 3 [Member] | Redeemable Convertible Preferred Stock Tranche Liability [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total financial liabilities   1,643  
Level 3 [Member] | Redeemable Convertible Preferred Stock Warrant Liability [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total financial liabilities   $ 480 $ 1,023