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Income taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Deferred tax assets related to: |  |  |  |
Net operating loss carryforwards | $ 39,079 | $ 35,505 |  |
Capital loss carryforward | 7,011 | 0 |  |
Tax credit carryforward | 2,695 | 2,226 |  |
Stock-based compensation | 2,141 | 3,008 |  |
Accruals and reserves | 1,883 | 3,590 |  |
Inventory | 1,410 | 1,408 |  |
Fixed assets | 568 | 585 |  |
Lease liabilities | 3,540 | 3,950 |  |
Capitalized research and development | 3,222 | 4,818 |  |
Fair value change in investments | 556 | 0 |  |
Other | 1,084 | 875 |  |
Total deferred tax assets | 63,189 | 55,965 |  |
Deferred tax liabilities related to: |  |  |  |
Intangibles | (2,326) | (3,696) |  |
Right-of-use assets | (2,654) | (2,500) |  |
Fair value change in investments | 0 | (440) |  |
Total deferred tax liabilities | (4,980) | (6,636) |  |
Net deferred tax assets before valuation allowance | 58,209 | 49,329 |  |
Less: valuation allowance | 58,333 | 49,517 | $ 33,402 | $ 2,993
Net deferred tax liabilities | (124) | (188) |  |
Less: deferred tax liability, discontinued operations | 0 | (74) |  |
Net deferred tax liabilities, continuing operations | $ (124) | $ (114) |  |

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