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Income taxes - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | $ 680,200,000 |  | $ 680,200,000 |  |  |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets | 8,100,000 |  | 8,100,000 |  |  |
Income tax (benefit) expense | 100,000 | $ (3,900,000) | 4,826,000 | $ (4,428,000) | $ 1,359,000 |
Loss before income taxes | $ 44,500,000 | $ 91,900,000 | $ (61,957,000) | $ (19,070,000) | $ (107,675,000) |
Effective tax rate | 0.30% | (4.30%) | (7.80%) | 23.20% | (1.30%) |
Current Foreign Tax Expense (Benefit) | $ 1,500,000 | $ 300,000 | $ 4,956,000 | $ (4,391,000) | $ 4,394,000 |
Income Tax Effects Allocated Directly to Equity, Other | 300,000 | 1,600,000 | 2,100,000 | 700,000 |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability | (300,000) |  | 2,600,000 |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease) |  |  | 500,000 |  |  |
Restructuring adjustments | 3,500,000 |  | 0 | 0 | (18,694,000) |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 3,200,000 | 1,500,000 | 9,600,000 | 200,000 |  |
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions |  |  | 2,541,000 | 250,000 | 483,000 |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions |  |  | 1,681,000 | 0 | 445,000 |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  |  | (3,929,000) | (5,628,000) | (26,956,000) |
Increase in Unrecognized Tax Benefits is Reasonably Possible | 13,000,000.0 |  | 13,000,000.0 |  |  |
Tax Adjustments, Settlements, and Unusual Provisions |  | 300,000 | (200,000) | 1,200,000 |  |
Other Tax Expense (Benefit) |  | 400,000 |  | 200,000 |  |
Unrecognized Tax Benefits | 27,471,000 | 27,178,000 | 27,471,000 | 27,178,000 | 32,556,000 | $ 58,584,000
Accruals and reserves | 11,687,000 | 19,493,000 | 11,687,000 | 19,493,000 |  |
Deferred Tax Assets, Gross | 296,609,000 | 290,795,000 | 296,609,000 | 290,795,000 |  |
Valuation allowance | (287,276,000) | (277,693,000) | (287,276,000) | (277,693,000) |  |
Deferred Tax Assets, Net of Valuation Allowance | 9,333,000 | 13,102,000 | 9,333,000 | 13,102,000 |  |
Deferred Tax Liabilities, Property, Plant and Equipment | (1,112,000) | 0 | (1,112,000) | 0 |  |
Deferred Tax Liabilities, Other | (7,255,000) | (12,238,000) | (7,255,000) | (12,238,000) |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 15,300,000 | 12,500,000 | 15,300,000 | 12,500,000 | 17,300,000 |
Income (Loss) from Continuing Operations before Income Taxes, Domestic |  |  | (70,572,000) | (28,233,000) | (110,318,000) |
Income (Loss) from Continuing Operations before Income Taxes, Foreign |  |  | 8,615,000 | 9,163,000 | $ 2,643,000 |
Net operating loss carryforwards | 177,987,000 | 163,832,000 | 177,987,000 | 163,832,000 |  |
Tax credit carryforwards | 79,694,000 | 75,624,000 | 79,694,000 | 75,624,000 |  |
Stock-based compensation | 5,192,000 | 5,710,000 | 5,192,000 | 5,710,000 |  |
Allowance for returns | 2,492,000 | 4,150,000 | 2,492,000 | 4,150,000 |  |
Intangible assets | 5,453,000 | 5,384,000 | 5,453,000 | 5,384,000 |  |
Deferred Tax Assets, Operating lease liabilities | 14,104,000 | 16,602,000 | 14,104,000 | 16,602,000 |  |
Deferred Tax Liabilities, Gross | (8,367,000) | (12,238,000) | (8,367,000) | (12,238,000) |  |
Deferred Income Tax Assets, Net | 966,000 | $ 864,000 | 966,000 | $ 864,000 |  |
deferred tax assets, valuation allowance, change due to extinguishment of debt |  |  | 7,200,000 |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 680,200,000 |  | 680,200,000 |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 1,700,000 |  | 1,700,000 |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | 13,000,000.0 |  | 13,000,000.0 |  |  |
Domestic Tax Authority [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Tax Credit Carryforward, Amount | 45,800,000 |  | 45,800,000 |  |  |
Tax Credit Carryforward, Amount | 45,800,000 |  | 45,800,000 |  |  |
california [Domain] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Tax Credit Carryforward, Amount | 42,900,000 |  | 42,900,000 |  |  |
Tax Credit Carryforward, Amount | 42,900,000 |  | 42,900,000 |  |  |
california [Domain] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 239,700,000 |  | 239,700,000 |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 239,700,000 |  | 239,700,000 |  |  |
States Other than CA [Domain] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 234,700,000 |  | 234,700,000 |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | $ 234,700,000 |  | $ 234,700,000 |  |  |

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