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Share-based compensation - Summary of Key Inputs (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 02, 2021
Mar. 31, 2021
Peer Shareholder Return    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of Total Award 50.00% 50.00%
Grant Date Fair Value by Component $ 3,088  
Volatility Rate 57.69%  
Interest Rate 0.16%  
Dividend Yield 0.00%  
Growth Rate    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of Total Award 50.00% 50.00%
Grant Date Fair Value by Component $ 2,230  
Volatility Rate 57.69%  
Interest Rate 0.16%  
Dividend Yield 0.00%