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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2022
Income Tax Disclosure [Abstract] |
U.S. and Foreign Components of Loss Before Income Taxes | The components of the provision for income taxes for the periods indicated are as follows (in thousands):
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
United States | $ | (1,600,323) |  |  | $ | (1,072,489) |  |  | $ | (1,804,623) |
Foreign | 21,684 |  |  | 21,570 |  |  | 7,232 |
Loss before income taxes | $ | (1,578,639) |  |  | $ | (1,050,919) |  |  | $ | (1,797,391) |
Components of Provision for Income Taxes | The provision for income taxes for the periods indicated are as follows (in thousands):
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
Current provision |  |  |  |  |
Federal | $ | — |  |  | $ | — |  |  | $ | — |
State | 1,256 |  |  | 1,272 |  |  | 1,201 |
Foreign | 4,240 |  |  | 7,228 |  |  | 1,156 |
Total current | $ | 5,496 |  |  | $ | 8,500 |  |  | $ | 2,357 |
Deferred provision |  |  |  |  |
Federal | 481 |  |  | 639 |  |  | (36,375) |
State | 1,256 |  |  | — |  |  | (9,534) |
Foreign | (1,361) |  |  | 2,086 |  |  | (982) |
Total deferred | 376 |  |  | 2,725 |  |  | (46,891) |
Total provision for (benefit from) income taxes | $ | 5,872 |  |  | $ | 11,225 |  |  | $ | (44,534) |
Reconciliation of Statutory Federal Income Tax Rate to the Effective Rate | A reconciliation of the U.S. federal statutory income tax rates to the Company’s effective tax rate is as follows:
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
Provision at federal statutory rate | 21.0 | % |  | 21.0 | % |  | 21.0 | %
State, net of federal benefit | 2.1 |  |  | 2.6 |  |  | 3.2 |
Permanent tax adjustments | (0.4) |  |  | (0.2) |  |  | (0.4) |
Nondeductible expenses | (0.7) |  |  | (1.1) |  |  | (0.6) |
Stock-based compensation | (4.9) |  |  | 2.5 |  |  | 1.0 |
Convertible senior notes | — |  |  | — |  |  | 2.7 |
Change in valuation allowance | (17.1) |  |  | (25.2) |  |  | (24.0) |
Other adjustments | (0.4) |  |  | (0.7) |  |  | (0.3) |
Provision for income taxes | (0.4) | % |  | (1.1) | % |  | 2.6 | %
Schedule of Deferred Tax Assets and Liabilities | The significant components of the Company’s deferred tax assets and liabilities as of the periods indicated were as follows (in thousands):
| December 31,
| 2022 |  | 2021
Deferred tax assets: |  |  |
Net operating loss carryforwards | $ | 2,127,233 |  |  | $ | 2,079,896 |
Insurance reserves and accruals | 296,423 |  |  | 276,625 |
Stock-based compensation | 19,132 |  |  | 38,066 |
Capitalized research expenses | 163,370 |  |  | — |
Accrued legal settlement/fees | 114,963 |  |  | 89,680 |
Lease liability | 55,579 |  |  | 66,211 |
Accrued and other liabilities | 76,311 |  |  | 64,555 |
Total deferred tax assets | 2,853,011 |  |  | 2,615,033 |
Less: Valuation allowance | (2,706,982) |  |  | (2,408,647) |
Deferred tax assets, net of valuation allowance | 146,029 |  |  | 206,386 |
Deferred tax liabilities: |  |  |
State income taxes | (124,982) |  |  | (115,768) |
Operating lease right of use assets | (36,379) |  |  | (59,838) |
Convertible senior notes | — |  |  | (31,892) |
Total deferred tax liabilities | (161,361) |  |  | (207,498) |
Net deferred tax assets (liabilities) | $ | (15,332) |  |  | $ | (1,112) |
Summary of Rollforward of Valuation Allowance | A reconciliation of the valuation allowance is as follows (in thousands):
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
Beginning balance | $ | 2,408,647 |  |  | $ | 2,144,548 |  |  | $ | 1,751,118 |
Net changes in deferred tax assets and liabilities | 298,335 |  |  | 264,099 |  |  | 393,430 |
Ending balance | $ | 2,706,982 |  |  | $ | 2,408,647 |  |  | $ | 2,144,548 |

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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