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Stock-Based Compensation - 2016 Stock Option Plan (Details) - shares
3 Months Ended
Jan. 01, 2020
Jan. 01, 2019
Mar. 31, 2020
Jun. 21, 2016
Stock Based Compensation        
Increase in shares available for grant (in shares) 1,384,128 1,000,802    
Employee and nonemployee stock options        
Stock Based Compensation        
Expiration term     10 years  
Employee and nonemployee stock options | New Hires        
Stock Based Compensation        
Vesting period     4 years  
Employee and nonemployee stock options | First vesting | New Hires        
Stock Based Compensation        
Percentage of vesting rights     25.00%  
Vesting period     1 year  
Nonvested restricted stock units issued and outstanding        
Stock Based Compensation        
Vesting period     4 years  
Nonvested restricted stock units issued and outstanding | First vesting | New Hires        
Stock Based Compensation        
Percentage of vesting rights     25.00%  
Vesting period     1 year  
2016 Stock Option and Incentive Plan        
Stock Based Compensation        
Maximum automatic annual increase as a percentage of outstanding common shares     5.00%  
Increase in shares available for grant (in shares) 6,920,640 5,004,011    
2016 Stock Option and Incentive Plan | Common Class A        
Stock Based Compensation        
Shares reserved for issuance (in shares)       11,500,000
2016 Stock Option and Incentive Plan | Employee and nonemployee stock options        
Stock Based Compensation        
Minimum grant price as a percentage of fair market value per share of the underlying common stock on the date of grant (as a percent)     100.00%