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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Operating Loss Carryforwards [Line Items] |  |
Income tax adjustment | $ 13,000 | $ 27,900
Rate change - decrease in valuation allowance | 367,963 | 380,990
Gross unrecognized tax benefits | 18,100 | 18,400
Penalties and interest accrued | 100 | 100
Deferred Tax Asset, Operating Loss Carryforwards |  |
Operating Loss Carryforwards [Line Items] |  |
Change in valuation allowance | 82,200 |
Securities Purchase Agreement | HCA Healthcare, Inc. | Health Care Services |  |
Operating Loss Carryforwards [Line Items] |  |
Change in valuation allowance | (95,200) |
Federal |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss carryforwards | 808,700 | 812,000
Operating loss carryforwards, indefinite lived | 335,800 | 181,100
State |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss carryforwards | 2,200 | 2,300
Federal and state |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss carryforwards valuation allowance | 315,300 | 328,400
Tax credit valuation allowance | 50,400 | $ 50,300
Capital loss carryforward | Federal and state |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit valuation allowance | $ 2,200 |

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- Definition The sum of the differences between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in all income tax contingencies, whether recorded or adjusted, during the period. + References No definition available. + Details
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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=121826272&loc=d3e32537-109319 + Details
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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319 + Details
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