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Stock-Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended
Jan. 01, 2020
Mar. 28, 2018
Mar. 27, 2018
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock share issued       30,821,892   30,663,054
Share based compensation expense       $ 769,000 $ 726,000  
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       2,001,600    
Weighted average exercise price       $ 5.28    
Weighted average grant date fair value       $ 0.54    
Performance Based Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share based compensation expense       $ 0    
Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost       $ 3,600,000    
Unrecognized compensation expenses, recognition period       2 years 10 months 28 days    
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 1,226,500          
Shares available for future issuance       3,612,870    
2018 Employee Stock Purchase Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Increased in authorized shares reserved for issuance 306,631          
Shares available for future issuance       864,200    
Shares reserved for future issuance   314,000        
Common stock share issued       57,011    
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%