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Stock-Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Jan. 01, 2021
Jan. 01, 2019
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Sep. 20, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share based compensation granted under plan vested period     4 years 2 years      
Share based compensation, vest period     1 year        
Share based compensation, term of plan     10 years        
Total number of shares outstanding     10,024,525        
Common stock available for issuance under stock option plan     4,743,725        
Restricted stock units granted     0 550,890      
Fair value of restricted stock units vested     $ 0   $ 0    
Outstanding and unvested restricted stock units     1,286,175        
Stock-based compensation expense     $ 21,976,000   $ 31,110,000    
Weighted average grant date fair value per share     $ 54.93   $ 46.44    
Restricted Stock Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock units granted     341,721        
Outstanding and unvested restricted stock units     1,286,175     957,695  
Stock-based compensation expense     $ 2,055,000        
Performance Restricted Stock Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of restricted stock units vested     0   $ 0    
Total unrecognized stock-based compensation expense     $ 85,600,000        
Performance Restricted Stock Units [Member] | Commercial Milestones [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock units granted     341,721   393,811    
Stock Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options granted     1,740,263        
Total number of shares outstanding     8,738,350     7,157,830  
Total unrecognized stock-based compensation expense     $ 152,700,000        
Weighted average period of unrecognized compensation costs     2 years 4 months 28 days        
Intrinsic value of options exercised     $ 2,200,000   $ 100,000    
Stock-based compensation expense     19,679,000   30,218,000    
Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options granted   0          
Total unrecognized stock-based compensation expense     $ 26,900,000        
Number of shares outstanding and unvested stock options     936,053        
Performance Shares [Member] | Chief Executive Officer [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options granted     650,000        
Performance-Based Stock Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense     $ 0   $ 0    
Restricted Stock Units Vest One Year Anniversary [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock units cliff vesting percentage     25.00%        
Restricted Stock Units Vest One Year Anniversary [Member] | Restricted Stock Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock units cliff vesting percentage       25.00%      
Restricted stock units vesting period month and year       2021-04      
Restricted Stock Units Vest Two Year Anniversary [Member] | Restricted Stock Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock units cliff vesting percentage       75.00%      
Restricted stock units vesting period month and year       2022-04      
2011 Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options granted     0        
2014 Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock shares annual increase added to plan 2,332,336            
2014 Plan [Member] | Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of increase on outstanding shares of Common stock           4.00%  
2016 Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total number of shares reserved for issuance             1,200,000