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Stock-Based Compensation - Additional Information (Detail) - $ / shares
9 Months Ended
Jan. 01, 2019
Mar. 28, 2018
Mar. 27, 2018
Sep. 30, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock share issued       30,663,054 30,057,970
Employees [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Option grants       635,000  
Weighted average grant date fair value       $ 2.46  
Service Based Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Option grants       1,665,418  
Weighted average grant date fair value       $ 2.25  
2018 Stock Option and Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of increases in authorized shares     2,800,721    
Percentage applied to the outstanding shares as annual increase in the number of shares authorized for issuance     4.00%    
Increased in authorized shares reserved for issuance 1,202,319        
Shares available for future issuance       2,372,248  
2018 Employee Stock Purchase Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Increased in authorized shares reserved for issuance 300,580        
Shares available for future issuance       614,580  
Shares reserved for future issuance   314,000      
Common stock share issued       0  
2018 Employee Stock Purchase Plan [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of increases in authorized shares   500,000      
Percentage of shares of common stock available for issuance   1.00%