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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income taxes |  |  |
Pre-change net operating losses that can be used in future years | $ 13,500 |  |
Net operating losses not subject to IRC section 382 | 450,900 |  |
Deferred tax assets, U.S. net operating loss carryforwards | 464,400 |  |
Amount of net operating loss carryforwards that will expire due to IRC Section 382 limitations | 4,400 |  |
Net operating loss carryforwards | 120,992 | $ 64,014 |
Un-repatriated foreign earnings | 0 |  |
Restated adjustment |  |  |
Income taxes |  |  |
Net operating loss carryforwards | 205,200 | 25,000 | $ 43,400
Canada |  |  |
Income taxes |  |  |
Research and experimental development expenditure carryforwards | 17,200 |  |
Canadian ITC credit carryforwards | 1,300 |  |
Foreign |  |  |
Income taxes |  |  |
Net operating loss carryforwards | 10,014 | $ 9,576 |
Foreign | French |  |  |
Income taxes |  |  |
Unused net operating loss carryforwards | 21,300 |  |
Foreign | Canada |  |  |
Income taxes |  |  |
Net operating loss carryforwards | $ 14,000 |  |

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