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Share-Based Compensation - Additional Information (Detail) - 2017 Plan [Member] - shares
9 Months Ended
Jun. 28, 2017
Sep. 30, 2018
Oct. 18, 2017
Oct. 17, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized for issuance   1,785,416 2,696,401 1,785,416
Number of shares to be incremented   607,324    
Percentage of outstanding shares of common stock to be incremented   4.00%    
Options granted   322,730    
Options outstanding   2,186,378    
Common stock available for issuance   476,711    
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price per share of stock options as a percentage of fair market value of share of common stock   100.00%    
Options vesting period 10 years