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Stock-based compensation (Details) - shares
Apr. 02, 2022
Sep. 12, 2017
2013 Equity Plan    
Stock-based compensation    
Number of shares reserved for issuance   3,616,570
Amended and Restated 2013 Incentive Award Plan    
Stock-based compensation    
Number of shares reserved for issuance 11,116,570 11,116,570
Number of shares available for grant 6,062,634