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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Tax Contingency [Line Items] |  |  |
Valuation allowance | $ 630,590,000 | $ 552,165,000 |
Increase in valuation allowance | 78,400,000 | 74,600,000 | $ 208,100,000
Amount of unrecognized tax benefits that would impact the effective income tax rate | 600,000 |  |
Amount of unrecognized tax benefits that would impact deferred tax assets | 32,400,000 |  |
Income tax expense related to interest and penalties | 0 | $ 0 | $ 0
His Majesty's Revenue and Customs (HMRC) |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforwards | 209,500,000 |  |
Federal |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforwards | 1,604,000,000 |  |
Federal | Research and development tax credit carryforward |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax credit carryforwards | 73,400,000 |  |
State |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforwards | 860,200,000 |  |
State | Research and development tax credit carryforward |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax credit carryforwards | 34,600,000 |  |
Foreign |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax credit carryforwards | $ 600,000 |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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- Definition The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15 + Details
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