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Equity Incentive Plans (Tables) | 6 Months Ended
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Jun. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Schedule of Stock-Based Compensation Expense | Total stock-based compensation expense by function was as follows (in millions):
|  | Three Months Ended June 30, |  | Six Months Ended June 30, |
| 2025 |  | 2024 |  | 2025 |  | 2024 |  |  |
Research and development |  | $ | 44 |  |  | $ | 32 |  |  | $ | 73 |  |  | $ | 63 |  |  |  |
Selling, general, and administrative |  | 11 |  |  | 6 |  |  | 16 |  |  | 11 |  |  |  |
Total |  | $ | 55 |  |  | $ | 38 |  |  | $ | 89 |  |  | $ | 74 |  |  |  |
Schedule of Restricted Stock Unit Activity | RSU activity under the Plan and the 2017 Plan was as follows (in millions, except per share amounts):
|  | Number of shares |  | Weighted- average grant date fair value |
Unvested at December 31, 2024 |  | 76 |  |  | $ | 2.67 |  |
Granted |  | 51 |  |  | 7.44 |  |
Vested |  | (30) |  |  | 4.24 |  |
Forfeited |  | (6) |  |  | 3.18 |  |
Unvested at June 30, 2025 |  | 91 |  |  | $ | 4.80 |  |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions | Stock options granted under the Plan during the six months ended June 30, 2025 were as follows:
|  | Six Months Ended June 30, 2025 |  |
Stock options granted (in millions) |  | 2 |  |  |  |
Weighted average grant date fair value |  | $ | 6.48 |  |  |  |
Weighted average grant date fair value assumptions: |  |  |  |  |
Expected term |  | 6.2 years |  |  |
Risk-free interest rates |  | 4.3 | % |  |  |
Expected volatility |  | 88.8 | % |  |  |
Schedule of Share-Based Payment Arrangement, Option, Activity | Stock option activity under the Plan and the 2017 Plan was as follows (in millions, except per share amounts):
| Number of shares |  | Weighted average exercise price |  | Weighted average remaining contractual term (in years) |  | Aggregate intrinsic value |
Outstanding at December 31, 2024 | 117 |  |  | $ | 2.07 |  |  |  |  |  |
Granted | 2 |  |  | 8.47 |  |  |  |  |  |
Exercised | (13) |  |  | 2.08 |  |  |  |  |  |
Forfeited | (4) |  |  | 2.05 |  |  |  |  |  |
Outstanding at June 30, 2025 | 102 |  |  | $ | 2.19 |  |  | 7.1 |  | $ | 310 |  |
Exercisable at June 30, 2025 | 61 |  |  | $ | 1.81 |  |  | 6.2 |  | $ | 204 |  |

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