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Income taxes - Textual (Details) $ in Millions | Sep. 28, 2019 USD ($)
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Operating Loss Carryforwards [Line Items] |
Undistributed earnings | $ 5.9
Withholding tax liability | 0.5
Federal |
Operating Loss Carryforwards [Line Items] |
Net operating loss carryforwards | 60.6
Federal | Research tax credit carryforward |
Operating Loss Carryforwards [Line Items] |
Tax credit carryforward | 33.8
State |
Operating Loss Carryforwards [Line Items] |
Net operating loss carryforwards | 36.2
State | Research tax credit carryforward |
Operating Loss Carryforwards [Line Items] |
Tax credit carryforward | 25.9
Foreign |
Operating Loss Carryforwards [Line Items] |
Net operating loss carryforwards | 16.1
Foreign | Tax year expiration, indefinite |
Operating Loss Carryforwards [Line Items] |
Net operating loss carryforwards | 1.4
Foreign | Tax year expiration, 2027 |
Operating Loss Carryforwards [Line Items] |
Net operating loss carryforwards | $ 14.7

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