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Income taxes - Income Tax Expense (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax (benefit) expense | $ 100,000 | $ (3,900,000) | $ 4,826,000 | $ (4,428,000) | $ 1,359,000
Effective tax rate | 0.30% | (4.30%) | (7.80%) | 23.20% | (1.30%)
Current Federal Tax Expense (Benefit) |  |  | $ (164,000) | $ (52,000) | $ (2,821,000)
Current State and Local Tax Expense (Benefit) |  |  | 84,000 | 48,000 | 175,000
Current Foreign Tax Expense (Benefit) | $ 1,500,000 | $ 300,000 | 4,956,000 | (4,391,000) | 4,394,000
Current Income Tax Expense (Benefit) |  |  | 4,876,000 | (4,395,000) | 1,748,000
Deferred Federal Income Tax Expense (Benefit) |  |  | 0 | 0 | 248,000
Deferred Foreign Income Tax Expense (Benefit) |  |  | (50,000) | (33,000) | (637,000)
Deferred Income Tax Expense (Benefit) |  |  | (50,000) | $ (33,000) | $ (389,000)
Deferred Tax Assets, Tax Credit Carryforwards, Other | $ 16,800,000 |  | $ 16,800,000 |  |

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