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Income taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 3,200 | $ 1,500 | $ 9,600 | $ 200
Deferred tax assets: |  |  |  |
Net operating loss carryforwards | 177,987 | 163,832 | 177,987 | 163,832
Tax credit carryforwards | 79,694 | 75,624 | 79,694 | 75,624
Stock-based compensation | 5,192 | 5,710 | 5,192 | 5,710
Allowance for returns | 2,492 | 4,150 | 2,492 | 4,150
Intangible assets | 5,453 | 5,384 | 5,453 | 5,384
Accruals and reserves | 11,687 | 19,493 | 11,687 | 19,493
Total deferred tax assets | 296,609 | 290,795 | 296,609 | 290,795
Valuation allowance | (287,276) | (277,693) | (287,276) | (277,693)
Total deferred tax assets, net of valuation allowance | $ 9,333 | $ 13,102 | $ 9,333 | $ 13,102

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