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Share-based compensation - Summary of Key Inputs (Details) - USD ($)
$ in Thousands
Jan. 04, 2021
Jan. 02, 2020
Sep. 19, 2019
Jan. 02, 2019
Total Shareholder Return        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of Total Award 50.00% 50.00% 50.00% 50.00%
Grant Date Fair Value by Component $ 3,088 $ 1,334 $ 287 $ 537
Volatility 57.69% 24.87% 25.86% 27.78%
Interest Rate 0.16% 1.58% 1.72% 2.46%
Dividend Yield 0.00% 0.00% 0.00% 0.00%
Adjusted EBITDA Comparison        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of Total Award 50.00% 50.00% 50.00% 50.00%
Grant Date Fair Value by Component $ 2,230 $ 2,187 $ 448 $ 900
Volatility 57.69% 0.00% 0.00% 0.00%
Interest Rate 0.16% 0.00% 0.00% 0.00%
Dividend Yield 0.00% 0.00% 0.00% 0.00%