Income Taxes (Tables)
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12 Months Ended |
Dec. 31, 2020 |
| Income Tax Disclosure [Abstract] |
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| Summary of Loss Before Provision (benefit) for Income Taxes |
Loss before provision (benefit) for income taxes consisted of the following (in thousands): | | | | | | | | | | | | | | | | Years Ended December 31, | | | | 2020 | | 2019 | | 2018 | | | | | | | | | | | | | | | | | $ | (1,203,682) | | | $ | (580,362) | | | $ | (558,974) | | | | | 24,655 | | | | 13,091 | | | | (11,951) | | | | | | | | | | | | | | | | Loss before provision (benefit) for income taxes | | $ | (1,179,027) | | | $ | (567,271) | | | $ | (570,925) | | | | | | | | | | | | | | | |
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| Summary of Provision (benefit) for Income Taxes |
Provision (benefit) for income taxes consisted of the following (in thousands): | | | | | | | | | | | | | | | | Years Ended December 31, | | | | 2020 | | 2019 | | 2018 | | | | | | | | | | | | | | | | $ | — | | | $ | — | | | $ | — | | | | | 500 | | | | 139 | | | | 142 | | | | | 7,249 | | | | 19,435 | | | | 15,945 | | | | | | | | | | | | | | | | | | | 7,749 | | | | 19,574 | | | | 16,087 | | | | | | | | | | | | | | | | | | — | | | | — | | | | — | | | | | — | | | | — | | | | — | | | | | (20,385) | | | | (7,199) | | | | (6,985) | | | | | | | | | | | | | | | | | | | (20,385) | | | | (7,199) | | | | (6,985) | | | | | | | | | | | | | | | | Total provision (benefit) for income taxes | | $ | (12,636) | | | $ | 12,375 | | | $ | 9,102 | | | | | | | | | | | | | | | |
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| Summary of Reconciliation of Effective Income Tax Rate |
A reconciliation of the expected tax provision (benefit) at the statutory federal income tax rate to the Company’s recorded tax provision (benefit) consisted of the following (in thousands): | | | | | | | | | | | | | | | | Years Ended December 31, | | | | | | | | | | 2020 | | 2019 | | 2018 | Expected (benefit) at U.S. federal statutory rate | | $ | (247,596) | | | $ | (119,127) | | | $ | (119,894) | | State income taxes – net of federal benefit | | | 500 | | | | 139 | | | | 142 | | Foreign tax rate differential | | | (4,131) | | | | 25,430 | | | | 8,028 | | Research and development tax credits | | | (26,294) | | | | (2,106) | | | | (4,565) | | | | | (194,730) | | | | (6,069) | | | | 2,629 | | | | | — | | | | — | | | | (10,099) | | Non-deductible officers’ compensation | | | 76,093 | | | | — | | | | — | | Change in valuation allowance | | | 373,632 | | | | 112,149 | | | | 126,395 | | | | | 9,890 | | | | 1,959 | | | | 6,466 | | | | | | | | | | | | | | | | Total provision (benefit) for income taxes | | $ | (12,636) | | | $ | 12,375 | | | $ | 9,102 | | | | | | | | | | | | | | | |
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| Summary of Significant Deferred Tax Assets and Liabilities |
Significant deferred tax assets and liabilities consisted of the following (in thousands): | | | | | | | | | | | | As of December 31, | | | | | | | | | | 2020 | | 2019 | | | | | | | | | | | Net operating loss carryforwards | | $ | 853,861 | | | $ | 570,583 | | | | | 55,685 | | | | 36,269 | | | | | 68,626 | | | | 28,459 | | | | | 246,380 | | | | 181,901 | | | | | 57,543 | | | | — | | Depreciation and amortization | | | 28,970 | | | | 23,709 | | | | | | | | | | | | Gross deferred tax assets | | | 1,311,065 | | | | 840,921 | | | | | (48,120) | | | | — | | | | | | | | | | | | Total net deferred tax assets before valuation allowance | | | 1,262,945 | | | | 840,921 | | | | | (1,220,093) | | | | (819,738) | | | | | | | | | | | | | | $ | 42,852 | | | $ | 21,183 | | | | | | | | | | | |
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| Summary of Reconciliation of the Gross Unrecognized Tax Benefits |
A reconciliation of the gross unrecognized tax benefits consists of the following (in thousands): | | | | | | | | | | | | | | | | Years Ended December 31, | | | | | | | | | | 2020 | | 2019 | | 2018 | | | | | | | | | | | | | | | Unrecognized tax benefit beginning of year | | $ | 31,702 | | | $ | 27,812 | | | $ | 18,793 | | Increases in current year tax positions | | | 43,855 | | | | 6,301 | | | | 8,437 | | Increases in prior year tax positions | | | — | | | | 114 | | | | 582 | | Decreases in prior year tax positions | | | — | | | | (1,829 | ) | | | — | | Decreases in prior year tax positions due to settlements | | | — | | | | (696 | ) | | | — | | Decreases in prior year tax positions due to lapse of statute of limitations | | | — | | | | — | | | | — | | | | | | | | | | | | | | | | Unrecognized tax benefit end of year | | $ | 75,557 | | | $ | 31,702 | | | $ | 27,812 | | | | | | | | | | | | | | | |
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