000100 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 010000 - Statement - CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 010100 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 020000 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS link:presentationLink link:calculationLink link:definitionLink 030000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS link:presentationLink link:calculationLink link:definitionLink 040000 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 050000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 060100 - Disclosure - Description of business link:presentationLink link:calculationLink link:definitionLink 060200 - Disclosure - Summary of significant accounting policies link:presentationLink link:calculationLink link:definitionLink 060300 - Disclosure - Inventories link:presentationLink link:calculationLink link:definitionLink 060400 - Disclosure - Fixed assets, net link:presentationLink link:calculationLink link:definitionLink 060500 - Disclosure - Intangible assets, net link:presentationLink link:calculationLink link:definitionLink 060600 - Disclosure - Accrued liabilities link:presentationLink link:calculationLink link:definitionLink 060700 - Disclosure - Segment reporting link:presentationLink link:calculationLink link:definitionLink 060800 - Disclosure - Retirement savings plan link:presentationLink link:calculationLink link:definitionLink 060900 - Disclosure - Borrowings link:presentationLink link:calculationLink link:definitionLink 061000 - Disclosure - Stock incentive plans link:presentationLink link:calculationLink link:definitionLink 061100 - Disclosure - Income taxes link:presentationLink link:calculationLink link:definitionLink 061200 - Disclosure - Earnings per share link:presentationLink link:calculationLink link:definitionLink 061300 - Disclosure - Stock repurchase program link:presentationLink link:calculationLink link:definitionLink 061400 - Disclosure - Geographic area information link:presentationLink link:calculationLink link:definitionLink 061500 - Disclosure - Leases link:presentationLink link:calculationLink link:definitionLink 061600 - Disclosure - Quarterly results of operations (unaudited) link:presentationLink link:calculationLink link:definitionLink 061700 - Disclosure - Related party transactions link:presentationLink link:calculationLink link:definitionLink 061800 - Disclosure - Subsequent events link:presentationLink link:calculationLink link:definitionLink 061900 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure link:presentationLink link:calculationLink link:definitionLink 062000 - Disclosure - Insider Trading Policies and Procedures link:presentationLink link:calculationLink link:definitionLink 062100 - Disclosure - Insider Trading Arrangements link:presentationLink link:calculationLink link:definitionLink 070200 - Disclosure - Summary of significant accounting policies (Policies) link:presentationLink link:calculationLink link:definitionLink 080200 - Disclosure - Summary of significant accounting policies (Tables) link:presentationLink link:calculationLink link:definitionLink 080300 - Disclosure - Inventories (Tables) link:presentationLink link:calculationLink link:definitionLink 080400 - Disclosure - Fixed assets, net (Tables) link:presentationLink link:calculationLink link:definitionLink 080500 - Disclosure - Intangible assets, net (Tables) link:presentationLink link:calculationLink link:definitionLink 080600 - Disclosure - Accrued liabilities (Tables) link:presentationLink link:calculationLink link:definitionLink 080700 - Disclosure - Segment reporting (Tables) link:presentationLink link:calculationLink link:definitionLink 081000 - Disclosure - Stock incentive plans (Tables) link:presentationLink link:calculationLink link:definitionLink 081100 - Disclosure - Income taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 081200 - Disclosure - Earnings per share (Tables) link:presentationLink link:calculationLink link:definitionLink 081400 - Disclosure - Geographic area information (Tables) link:presentationLink link:calculationLink link:definitionLink 081500 - Disclosure - Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 081600 - Disclosure - Quarterly results of operations (unaudited) (Tables) link:presentationLink link:calculationLink link:definitionLink 090100 - Disclosure - Description of business (Details) link:presentationLink link:calculationLink link:definitionLink 090200 - Disclosure - Summary of significant accounting policies, Accounts receivable and credit losses (Details) link:presentationLink link:calculationLink link:definitionLink 090202 - Disclosure - Summary of significant accounting policies, Fixed assets (Details) link:presentationLink link:calculationLink link:definitionLink 090204 - Disclosure - Summary of significant accounting policies, Leases (Details) link:presentationLink link:calculationLink link:definitionLink 090206 - Disclosure - Summary of significant accounting policies, Goodwill and intangible assets (Details) link:presentationLink link:calculationLink link:definitionLink 090208 - Disclosure - Summary of significant accounting policies, Revenue recognition - Disaggregation of revenue (Details) link:presentationLink link:calculationLink link:definitionLink 090210 - Disclosure - Summary of significant accounting policies, Revenue recognition - Contract balances (Details) link:presentationLink link:calculationLink link:definitionLink 090212 - Disclosure - Summary of significant accounting policies, Revenue recognition - Remaining performance obligations (Details) link:presentationLink link:calculationLink link:definitionLink 090212 - Disclosure - Summary of significant accounting policies, Revenue recognition - Remaining performance obligations (Details)Default link:presentationLink link:calculationLink link:definitionLink 090214 - Disclosure - Summary of significant accounting policies, Concentration of credit risk (Details) link:presentationLink link:calculationLink link:definitionLink 090216 - Disclosure - Summary of significant accounting policies, Engineering, design and product development (Details) link:presentationLink link:calculationLink link:definitionLink 090218 - Disclosure - Summary of significant accounting policies, Advertising (Details) link:presentationLink link:calculationLink link:definitionLink 090300 - Disclosure - Inventories (Details) link:presentationLink link:calculationLink link:definitionLink 090400 - Disclosure - Fixed assets, net (Details) link:presentationLink link:calculationLink link:definitionLink 090500 - Disclosure - Intangible assets, net (Details) link:presentationLink link:calculationLink link:definitionLink 090600 - Disclosure - Accrued liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 090700 - Disclosure - Segment reporting, Operating financial results of segment (Details) link:presentationLink link:calculationLink link:definitionLink 090702 - Disclosure - Segment reporting, Reconciliation of net loss to EBITDA and adjusted EBITDA (Details) link:presentationLink link:calculationLink link:definitionLink 090800 - Disclosure - Retirement savings plan (Details) link:presentationLink link:calculationLink link:definitionLink 090900 - Disclosure - Borrowings (Details) link:presentationLink link:calculationLink link:definitionLink 091000 - Disclosure - Stock incentive plans, Stock incentive plans (Details) link:presentationLink link:calculationLink link:definitionLink 091002 - Disclosure - Stock incentive plans, Assumptions used in option valuation calculations (Details) link:presentationLink link:calculationLink link:definitionLink 091004 - Disclosure - Stock incentive plans, Share-based compensation expense (Details) link:presentationLink link:calculationLink link:definitionLink 091006 - Disclosure - Stock incentive plans, Equity awards (Details) link:presentationLink link:calculationLink link:definitionLink 091100 - Disclosure - Income taxes, Components of loss before income taxes (Details) link:presentationLink link:calculationLink link:definitionLink 091102 - Disclosure - Income taxes, Components of income tax expense (Details) link:presentationLink link:calculationLink link:definitionLink 091104 - Disclosure - Income taxes, Income taxes paid (net of refunds) (Details) link:presentationLink link:calculationLink link:definitionLink 091106 - Disclosure - Income taxes, Carryforwards (Details) link:presentationLink link:calculationLink link:definitionLink 091108 - Disclosure - Income taxes, Deferred tax assets and liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 091110 - Disclosure - Income taxes, Valuation allowance on deferred tax assets (Details) link:presentationLink link:calculationLink link:definitionLink 091112 - Disclosure - Income taxes, Statutory to effective tax rate reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 091114 - Disclosure - Income taxes, Unrecognized tax benefits (Details) link:presentationLink link:calculationLink link:definitionLink 091200 - Disclosure - Earnings per share (Details) link:presentationLink link:calculationLink link:definitionLink 091300 - Disclosure - Stock repurchase program (Details) link:presentationLink link:calculationLink link:definitionLink 091400 - Disclosure - Geographic area information (Details) link:presentationLink link:calculationLink link:definitionLink 091500 - Disclosure - Leases (Details) link:presentationLink link:calculationLink link:definitionLink 091502 - Disclosure - Leases (Details) Calc 2 link:presentationLink link:calculationLink link:definitionLink 091600 - Disclosure - Quarterly results of operations (unaudited) (Details) link:presentationLink link:calculationLink link:definitionLink 091700 - Disclosure - Related party transactions (Details) link:presentationLink link:calculationLink link:definitionLink 091800 - Disclosure - Subsequent events (Details) link:presentationLink link:calculationLink link:definitionLink