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Fair Value Measurements - Summary of Changes in Fair Value of Company's Level 3 Financial Instruments (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]      
Financial liabilities, beginning balance $ 2,123    
Change in fair value upon revaluation (525) $ 543 $ (872)
Change in fair value upon revaluation (4,194) (626) (897)
Reclassification of redeemable convertible preferred stock warrant liability to redeemable convertible preferred stock (1,005)    
Settlement of redeemable convertible preferred stock tranche liability due to the issuance of Series C redeemable convertible preferred stock (5,837)    
Financial liabilities, ending balance   2,123  
Redeemable Convertible Preferred Stock Tranche Liability [Member]      
Fair Value Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]      
Financial liabilities, beginning balance 1,643    
Financial liabilities, ending balance   1,643  
Redeemable Convertible Preferred Stock Warrant Liability [Member]      
Fair Value Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]      
Financial liabilities, beginning balance 480    
Reclassification of redeemable convertible preferred stock warrant liability to redeemable convertible preferred stock (1,000)    
Financial liabilities, ending balance   480  
Level 3 [Member]      
Fair Value Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]      
Financial liabilities, beginning balance 2,123    
Financial liabilities, ending balance   2,123  
Level 3 [Member] | Redeemable Convertible Preferred Stock Tranche Liability [Member]      
Fair Value Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]      
Financial liabilities, beginning balance 1,643    
Issuance of Series C redeemable convertible preferred stock tranche liability   1,017  
Change in fair value upon revaluation 4,194 626  
Settlement of redeemable convertible preferred stock tranche liability due to the issuance of Series C redeemable convertible preferred stock (5,837)    
Financial liabilities, ending balance   1,643  
Level 3 [Member] | Redeemable Convertible Preferred Stock Warrant Liability [Member]      
Fair Value Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]      
Financial liabilities, beginning balance 480 1,023  
Change in fair value upon revaluation 525 (543)  
Reclassification of redeemable convertible preferred stock warrant liability to redeemable convertible preferred stock $ (1,005)    
Financial liabilities, ending balance   $ 480 $ 1,023