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Stockholders’ Deficit - Schedule of Stock Option and Restricted Stock Activity (Details) $ / shares in Units, shares in Millions, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 USD ($) $ / shares shares | Dec. 31, 2024 USD ($) $ / shares shares
Number of shares available for issuance under the Plans |  |
Beginning balance (in shares) | 122.8 |
Additional shares authorized (in shares) | 14.8 |
Options and restricted stock units and awards canceled (in shares) | 5.1 |
Shares withheld related to net share settlement of restricted stock units and awards (in shares) | 3.8 |
Options and restricted stock units and awards granted (in shares) | (14.6) |
Ending balance (in shares) | 131.9 | 122.8
Number of shares outstanding under the Plans |  |
Beginning balance (in shares) | 0.1 |
Options exercised and restricted stock units and awards released (in shares) | (0.1) |
Ending balance (in shares) | 0.0 | 0.1
Vested at end of period (in shares) | 0.0 |
Unvested at end of period (in shares) | 0.0 |
Weighted- average exercise price per share |  |
Beginning balance (in dollars per share) | $ / shares | $ 6.13 |
Options exercised and restricted stock units and awards released (in dollars per share) | $ / shares | 6.62 |
Ending balance (in dollars per share) | $ / shares | 0 | $ 6.13
Vested at end of period (in dollars per share) | $ / shares | 0 |
Unvested at end of period (in dollars per share) | $ / shares | $ 0 |
Weighted- average remaining contractual term (In years) |  |
Weighted-average contractual term | 0 years | 3 years 10 months 24 days
Vested at end of period (in years) | 0 years |
Unvested at end of period (in years) | 0 years |
Options outstanding, aggregate intrinsic value | $ | $ 0.0 | $ 0.6
Vested at end of period, aggregate intrinsic value | $ | 0.0 |
Unvested at end of period, aggregate intrinsic value | $ | $ 0.0 |
Restricted Stock |  |
Restricted stock outstanding, Number of shares outstanding under the Plans |  |
Beginning balance (in shares) | 25.7 |
Options exercised and restricted stock units and awards released (in shares) | (9.4) |
Options and restricted stock units and awards canceled (in shares) | (5.1) |
Options and restricted stock units and awards granted (in shares) | 14.6 |
Ending balance (in shares) | 25.8 | 25.7
Vested at end of period (in shares) | 0.0 |
Restricted stock outstanding, Weighted- average grant date fair value per share |  |
Beginning balance (in dollars per share) | $ / shares | $ 23.79 |
Options exercised and restricted stock units and awards released (in dollars per share) | $ / shares | 24.35 |
Options and restricted stock units and awards canceled (in dollars per share) | $ / shares | 24.46 |
Options and restricted stock units and awards granted (in dollars per share) | $ / shares | 27.30 |
Ending balance (in dollars per share) | $ / shares | 25.44 | $ 23.79
Vested at end of period (in dollars per share) | $ / shares | $ 0 |

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