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Stock-Based Compensation - 2015 Equity Incentive Plan (Details) - shares
12 Months Ended
Jan. 01, 2021
Dec. 31, 2020
Jun. 30, 2015
2015 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares reserved for issuance (in shares)     4,700,000
Common shares reserved for issuance, annual increase period (not more than) (years)   10 years  
Common shares reserved for issuance, percentage of annual increase (percent)   5.00%  
Shares available to be issued (in shares)   5,887,965  
2015 Plan | Subsequent Event      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares reserved for issuance, percentage of annual increase (percent) 2.50%    
Common shares reserved for issuance, annual increase (in shares) 1,237,090    
2009 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available to be issued (in shares)   0