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Stock Option Plans - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock reserved for issuance   2,565,984   2,565,984   6,579,361
Options available for grant, options granted     0      
Options, weighted-average grant-date fair value   $ 6.09   $ 3.16 $ 1.04  
Stock-based compensation expense   $ 448,000 $ 22,000 $ 610,000 $ 62,000  
Total unrecognized stock-based compensation costs related to stock options   $ 2,800,000   $ 2,800,000    
Period of unrecognized stock-based compensation costs to be recognized       3 years    
2016 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock reserved for issuance 1,200,000 1,200,000   1,200,000    
Vesting percentage of requisite service period 25.00%          
Additional vesting years 3 years          
2016 Equity Incentive Plan [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expiration period 10 years          
Exercise price as a percentage of the fair market value of common stock on grant date 100.00%          
2016 Equity Incentive Plan [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price as a percentage of the fair market value for option holding more than 10% total combined voting power 110.00%          
Minimum percentage of voting right to grant stock option 10.00%          
2016 Employee Stock Purchase Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock reserved for issuance 150,000          
Percentage of discount from fair market value of common stock on offering date 85.00%          
Maximum percentage of outstanding stock issuance 1.00%          
Maximum number of outstanding stock issuance 300,000          
Maximum period for additional outstanding stock issuance 10 years          
2016 Employee Stock Purchase Plan [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum percentage of payroll deductions on eligible compensation 15.00%          
Non-employee Consultants [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options granted   7,752 0 25,647 0  
Stock-based compensation expense   $ 226,000 $ 4,000 $ 264,000 $ 14,000