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Equity Plans and Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Option Activity under Stock-Based Compensation Plans | The following table summarizes the activity of stock options for the six months ended June 30, 2025:
| Shares Underlying Outstanding Options (in thousands) |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (in thousands)
Balance as of December 31, 2024 | 11,142 |  | $ | 11.15 |  |  | 3.79 |  | $ | 24,210 |
Options granted | 1,819 |  | 12.41 |  |  |  |  |
Options exercised | (723) |  | 9.31 |  |  |  |  |
Options cancelled: |  |  |  |  |  |  |
Options forfeited (unvested) | (131) |  | 12.33 |  |  |  |  |
Options expired (vested) | (751) |  | 16.50 |  |  |  |  |
Balance as of June 30, 2025 | 11,356 |  | $ | 11.10 |  |  | 3.92 |  | $ | 7,621 |
Vested and expected to vest as of June 30, 2025 | 11,135 |  | $ | 11.08 |  |  | 3.87 |  | $ | 7,621 |
Exercisable as of June 30, 2025 | 8,163 |  | $ | 10.64 |  |  | 3.05 |  | $ | 7,619 |
Summary of Restricted Stock Units Activity | The following table summarizes the activity of RSUs for the six months ended June 30, 2025:
| Number of Shares (in thousands) |  | Weighted-Average Grant-Date Fair Value Per Share
Non-vested as of December 31, 2024 | 5,363 |  | $ | 12.15 |
Granted | 2,738 |  | 12.63 |
Vested (1) | (2,148) |  | 12.05 |
Forfeited | (251) |  | 12.30 |
Non-vested as of June 30, 2025 | 5,702 |  | $ | 12.41 |
(1)Inclusive of approximately 813,695 RSUs for the six months ended June 30, 2025, which were not converted into shares due to net share settlement in order to cover the required amount of employee withholding taxes. The value of the withheld shares was classified as a reduction to additional paid-in capital.
Summary of Performance Based Restricted Stock Unit | We granted market-based performance restricted stock units (“PSUs”) to certain executives. These PSUs vest upon a specified market condition. The summary of PSU activities for the six months ended June 30, 2025 is as follows:
| Number of Shares (in thousands) |  | Weighted-Average Grant-Date Fair Value Per Share
Non-vested as of December 31, 2024 | 1,115 |  | $ | 16.59 |
Granted | 517 |  | 20.19 |
Vested (1) | (193) |  | 11.62 |
Non-vested as of June 30, 2025 | 1,439 |  | $ | 18.55 |
(1)Inclusive of approximately 81,972 PSUs for the six months ended June 30, 2025, which were not converted into shares due to net share settlement in order to cover the required amount of employee withholding taxes. The value of the withheld shares was classified as a reduction to additional paid-in capital.
Fair Value-Based Measurements and Weighted-Average Assumptions | The weighted-average assumptions used in the calculations of these fair value measurements are as follows:
| Stock Options |  | Stock Options |  | Market-Based Performance Stock Units
| Three Months Ended June 30, |  | Six Months Ended June 30, |  | Six Months Ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024
Weighted-average fair value per share | $ | 5.36 |  |  | $ | 7.48 |  |  | $ | 7.13 |  |  | $ | 7.84 |  |  | $ | 20.19 |  |  | $ | 17.23 |
Risk-free interest rate | 4.0 | % |  | 4.3 | % |  | 4.2 | % |  | 4.2 | % |  | 4.2 | % |  | 4.3 | %
Expected life (in years) | 4.5 |  | 4.5 |  | 4.5 |  | 4.5 |  | 2.9 |  | 2.9
Volatility | 0.6 |  | 0.8 |  | 0.7 |  | 0.8 |  | 0.4 |  | 0.6
Stock-Based Compensation Expense | The following table summarizes stock-based compensation expense recorded in each component of operating expenses in our condensed consolidated statements of operations, and amounts capitalized to our inventories (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Research and development | $ | 2,834 |  |  | $ | 2,881 |  |  | $ | 5,818 |  |  | $ | 5,546 |
Selling, general and administrative | 8,823 |  |  | 9,255 |  |  | 18,772 |  |  | 18,175 |
Cost of sales - product | 430 |  |  | 549 |  |  | 946 |  |  | 1,108 |
Inventories | 892 |  |  | 833 |  |  | 1,898 |  |  | 1,703 |
Total | $ | 12,979 |  |  | $ | 13,518 |  |  | $ | 27,434 |  |  | $ | 26,532 |

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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (e)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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