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Equity Plans and Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2024
Share-Based Payment Arrangement, Noncash Expense [Abstract] |
Option Activity under Stock-Based Compensation Plans | The following table summarizes the activity of stock options for the three months ended March 31, 2024:
|  | 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, 2023 |  |  | 10,120 |  |  | $ | 10.78 |  |  |  | 4.18 |  |  | $ | 37,388 |
Options granted |  |  | 1,505 |  |  |  | 12.46 |  |  |  |  |  |  |
Options exercised |  |  | (240 | ) |  |  | 6.82 |  |  |  |  |  |  |
Options cancelled: |  |  |  |  |  |  |  |  |  |  |  |
Options forfeited (unvested) |  |  | (2 | ) |  |  | 9.52 |  |  |  |  |  |  |
Options expired (vested) |  |  | (89 | ) |  |  | 15.46 |  |  |  |  |  |  |
Balance as of March 31, 2024 |  |  | 11,294 |  |  | $ | 11.05 |  |  |  | 4.39 |  |  | $ | 23,032 |
Vested and expected to vest as of March 31, 2024 |  |  | 11,050 |  |  | $ | 11.03 |  |  |  | 4.35 |  |  | $ | 22,954 |
Exercisable as of March 31, 2024 |  |  | 7,653 |  |  | $ | 10.56 |  |  |  | 3.59 |  |  | $ | 20,912 |
Summary of Restricted Stock Units Activity | The following table summarizes the activity of RSUs for the three months ended March 31, 2024:
|  | Number of Shares (in thousands) |  |  | Weighted-Average Grant-Date Fair Value Per Share |
Non-vested as of December 31, 2023 |  |  | 4,445 |  |  | $ | 11.57 |
Granted |  |  | 2,962 |  |  |  | 12.49 |
Vested (1) |  |  | (1,637 | ) |  |  | 11.11 |
Forfeited |  |  | (54 | ) |  |  | 12.91 |
Non-vested as of March 31, 2024 |  |  | 5,716 |  |  | $ | 12.16 |
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 three months ended March 31, 2024 is as follows:
|  | Number of Shares (in thousands) |  |  | Weighted-Average Grant-Date Fair Value Per Share |
Non-vested as of December 31, 2023 |  |  | 557 |  |  | $ | 15.95 |
Granted |  |  | 558 |  |  |  | 17.23 |
Non-vested as of March 31, 2024 |  |  | 1,115 |  |  | $ | 16.59 |
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 |  |  |  | Market-Based Performance Stock Units |
|  | Three Months Ended |  |  |  | Three Months Ended |
|  | March 31, |  |  |  | March 31, |
|  | 2024 |  |  | 2023 |  |  |  | 2024 |  |  | 2023 |
Weighted-average fair value per share |  | $ | 7.88 |  |  | $ | 7.28 |  |  |  | $ | 17.23 |  |  | $ | 18.25 |
Risk-free interest rate |  |  | 4.2 | % |  |  | 4.0 | % |  |  |  | 4.3 | % |  |  | 4.3 | %
Expected life (in years) |  |  | 4.5 |  |  |  | 4.5 |  |  |  |  | 2.9 |  |  |  | 2.9 |
Volatility |  |  | 0.8 |  |  |  | 0.8 |  |  |  |  | 0.6 |  |  |  | 0.9 |
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 |  |
|  | March 31, |  |
|  | 2024 |  |  | 2023 |  |
Research and development |  | $ | 2,665 |  |  | $ | 2,112 |  |
Selling, general and administrative |  |  | 8,920 |  |  |  | 6,830 |  |
Cost of sales - product |  |  | 559 |  |  |  | 695 |  |
Inventories |  |  | 870 |  |  |  | 397 |  |
Total |  | $ | 13,014 |  |  | $ | 10,034 |  |

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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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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -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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