Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Stock Incentive Plans (Details)

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Stockholders' Equity - Stock Incentive Plans (Details) - shares
Dec. 31, 2020
Dec. 26, 2019
Dec. 29, 2016
Dec. 31, 2015
2011 Stock Option Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares of stock authorized under the plan     12,520,407 10,780,970
Shares available for grant (in shares)     179,575 104,269
2017 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares of stock authorized under the plan 5,000,000      
Shares available for grant (in shares) 2,120,839 2,806,549