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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Operating Loss Carryforwards [Line Items] |  |  |
Income tax refund, CARES Act | $ 17,500 |  |
Net operating loss carryforwards |  | $ 476,000 |
Deferred tax assets, valuation allowance |  | 168,174 | $ 130,010
Uncertain tax positions if recognized in the future would impact effective tax rate |  | 3,000 |
Unrecognized tax positions related to certain deductions |  | 27,154 | $ 342
Deductions |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Unrecognized tax positions related to certain deductions |  | 24,100 |
Research Tax Credit Carryforward |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforwards |  | $ 1,156 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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