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Share-Based Compensation - Additional Information (Detail) - shares
9 Months Ended
Jun. 28, 2017
Sep. 30, 2019
Mar. 11, 2019
Jan. 01, 2019
Oct. 18, 2017
Oct. 17, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized for issuance   3,635,225        
Common stock reserved for issuance   371,443        
Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share based compensation options granted   962,734        
Stock Option [Member] | Performance-based Vesting Criteria [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share based compensation options granted   100,000        
Restricted Stock Units (RSUs) [Member] | Performance-based Vesting Criteria [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted shares in addition to stock option   50,000        
2017 Plan [Member]            
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%        
Common stock available for issuance       607,324    
2017 Plan [Member] | Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share based compensation options granted   870,434        
2017 Plan [Member] | 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          
2019 Inducement Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock reserved for issuance     331,500      
2019 Inducement Plan [Member] | Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share based compensation options granted   92,300