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Fair Value Measurements - Summary of Changes in Fair Value of Company's Level 3 Financial Instruments (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Fair Value Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]          
Financial liabilities, beginning balance       $ 2,123,000  
Change in fair value upon revaluation       (4,194,000) $ (233,000)
Change in fair value upon revaluation   $ 0 $ 805,000 (525,000) $ 659,000
Settlement of redeemable convertible preferred stock tranche liability due to the issuance of Series C redeemable convertible preferred stock $ (5,800,000)     (5,837,000)  
Reclassification of redeemable convertible preferred stock warrant liability to redeemable convertible preferred stock       (1,005,000)  
Redeemable Convertible Preferred Stock Tranche Liability [Member]          
Fair Value Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]          
Financial liabilities, beginning balance       1,643,000  
Redeemable Convertible Preferred Stock Warrant Liability [Member]          
Fair Value Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]          
Financial liabilities, beginning balance       480,000  
Reclassification of redeemable convertible preferred stock warrant liability to redeemable convertible preferred stock       (1,000,000)  
Level 3 [Member]          
Fair Value Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]          
Financial liabilities, beginning balance       2,123,000  
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       1,643,000  
Change in fair value upon revaluation       4,194,000  
Settlement of redeemable convertible preferred stock tranche liability due to the issuance of Series C redeemable convertible preferred stock       (5,837,000)  
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       480,000  
Change in fair value upon revaluation       525,000  
Reclassification of redeemable convertible preferred stock warrant liability to redeemable convertible preferred stock       $ (1,005,000)