Balance sheet components - Other non-current assets (Details) - USD ($) $ in Thousands |
Sep. 30, 2022 |
Sep. 30, 2021 |
---|---|---|
Balance Sheet Related Disclosures [Abstract] | ||
Convertible note receivable | $ 0 | $ 3,021 |
Other non-current assets | 3,385 | 4,653 |
Other non-current assets | $ 3,385 | $ 7,674 |