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Balance sheet components - Finite-lived intangible assets, future amortization expense (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jun. 27, 2020 | Sep. 28, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross carrying amount | $ 7,622 |
Accumulated amortization | (940) |
Finite-lived intangible assets, net carrying value | 6,682 |
Intangible assets, gross carrying amount (excluding goodwill) | 27,722 |
Intangible assets, net carrying value (excluding goodwill) | $ 26,782 | $ 13
Weighted-average remaining life | 3 years 9 months 14 days |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |
Remainder of fiscal 2020 | $ 475 |
2021 | 1,899 |
2022 | 1,883 |
2023 | 1,235 |
2024 | 1,020 |
2025 | 170 |
Finite-lived intangible assets, net carrying value | 6,682 |
In progress research and development |  |
Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets (excluding goodwill) | 20,100 |
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross carrying amount | 7,583 |
Accumulated amortization | (929) |
Finite-lived intangible assets, net carrying value | $ 6,654 |
Weighted-average remaining life | 3 years 9 months 18 days |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |
Finite-lived intangible assets, net carrying value | $ 6,654 |
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross carrying amount | 39 |
Accumulated amortization | (11) |
Finite-lived intangible assets, net carrying value | $ 28 |
Weighted-average remaining life | 1 year 5 months 1 day |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |
Finite-lived intangible assets, net carrying value | $ 28 |

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