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Common Stock - Schedule of Common Stock Reserved for Issuance (Detail) - shares
Sep. 30, 2016
Dec. 31, 2015
Class of Stock [Line Items]    
Total 2,565,984 6,579,361
Redeemable Convertible Preferred Stock [Member]    
Class of Stock [Line Items]    
Total   5,323,103
Options Issued and Outstanding [Member]    
Class of Stock [Line Items]    
Total 1,496,156 833,178
Redeemable Convertible Preferred Stock Warrant Liability [Member]    
Class of Stock [Line Items]    
Total   275,861
Options Available for Future Grants [Member]    
Class of Stock [Line Items]    
Total 1,069,828 147,219