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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation Employee Stock-Based Compensation Plans At March 31, 2024, the Company had stock-based compensation awards outstanding under the following plans: the 2010 Equity Incentive Plan, as amended, or 2010 Plan, and the 2010 Employee Stock Purchase Plan, or ESPP. Refer to the Company’s Annual Report for a summary of its stock-based compensation and equity plans as of December 31, 2023. There have been no material changes to the terms of the Company’s equity incentive plans during the three months ended March 31, 2024. As of March 31, 2024, the number of shares of common stock available for future issuance under the 2010 Plan was 16,548,604 shares. As of March 31, 2024, the number of shares of common stock available for future issuance under the ESPP was 6,627,302 shares. Employee Incentive Bonus The Company’s Executive Incentive Bonus Plan permits the settlement of awards under the plan in any combination of cash or shares of its common stock. The Company settles a majority of bonus awards for its employees, including executives, in shares of common stock under the 2010 Equity Incentive Plan. When bonus awards are settled in common stock issued under the 2010 Equity Incentive Plan, the number of shares issuable to plan participants is determined based on the closing price of the Company’s common stock as determined in trading on the applicable stock exchange, on a date approved by the Board of Directors. In connection with the Company’s bonus programs, in February 2024, the Company issued 0.4 million freely-tradable (subject to certain restrictions for affiliates) shares of the Company’s common stock in settlement of bonus awards to employees, including executives, for the 2023 performance period. At March 31, 2024, the Company has an accrual of $7.6 million for bonus awards for employees for year-to-date achievement in the 2024 performance period, which the Company intends to settle primarily in shares of its common stock, unless otherwise required to be settled in cash due to local laws or agreements. The Company’s compensation committee retains discretion to effect payment in cash, stock, or a combination of cash and stock. Stock-Based Compensation The Company recognizes stock-based compensation in the consolidated statements of operations, based on the department to which the related employee reports, as follows:
|  |  | Three Months Ended March 31,
|  |  |  |  | 2024 |  | 2023
|  |  | (in thousands)
Cost of net revenue |  |  |  |  | $ | 181 |  |  | $ | 210 |
Research and development |  |  |  |  | 10,441 |  |  | 11,455 |
Selling, general and administrative |  |  |  |  | 6,439 |  |  | 4,783 |
|  |  |  |  | $ | 17,061 |  |  | $ | 16,448 |
The total unrecognized compensation cost related to unvested restricted stock units as of March 31, 2024 was $146.6 million, and the weighted average period over which these equity awards are expected to vest is 2.37 years. The total unrecognized compensation cost related to unvested performance-based restricted stock units as of March 31, 2024 was $9.1 million as a result of revised estimates of performance achievement levels as of that date, and the weighted average period over which these equity awards are expected to vest is 1.86 years. Actual levels of future performance for the unvested periods may differ from current estimates. The total unrecognized compensation cost related to unvested stock options as of March 31, 2024 was $29.5 million, and the weighted average period over which these equity awards are expected to vest is 3.89 years. Restricted Stock Units A summary of the Company’s restricted stock unit activity is as follows:
| Number of Shares (in thousands) |  | Weighted-Average Grant-Date Fair Value per Share
Outstanding at December 31, 2023 | 5,632 |  |  | $ | 36.72 |
Granted | 2,299 |  |  | 18.78 |
Vested | (1,313) |  |  | 31.07 |
Canceled | (387) |  |  | 38.48 |
Outstanding at March 31, 2024 | 6,231 |  |  | $ | 31.18 |
Performance-Based Restricted Stock Units Performance-based restricted stock units are eligible to vest at the end of each year-long performance period, as defined in the underlying agreement, in a three-year performance period based on the Company’s annual growth rate in net sales and non-GAAP diluted earnings per share (subject to certain adjustments) over baseline results relative to the growth rates for a peer group of companies for the same metrics and periods. For the performance-based restricted stock units granted to date, 60% of each performance-based award is subject to the net sales metric for the performance period and 40% is subject to the non-GAAP diluted earnings per share metric for the performance period. The maximum percentage for a particular metric is 250% of the target number of units subject to the award related to that metric, however, vesting of the performance stock units is capped at 30% and 100%, respectively, of the target number of units subject to the award in years one and two, respectively, of the three-year performance period. As of March 31, 2024, achievement to date under the performance metrics specified in the respective award agreements are based on its expected revenue and non-GAAP diluted EPS results over the performance periods and calculated growth rates relative to its peers’ expected results based on data available, as defined in the respective award agreements. To the extent any prior achievement levels are no longer probable, any compensation expense recorded is adjusted to the revised achievement levels. A summary of the Company’s performance-based restricted stock unit activity is as follows:
| Number of Shares (in thousands) |  | Weighted-Average Grant-Date Fair Value per Share
Outstanding at December 31, 2023 | 2,653 |  |  | $ | 34.38 |
Granted(1) | 1,460 |  |  | 17.77 |
Vested | (6) |  |  | 58.31 |
Canceled | (598) |  |  | 41.90 |
Outstanding at March 31, 2024 | 3,509 |  |  | $ | 26.15 |
________________ (1) Number of shares granted is based on the maximum percentage achievable in the performance-based restricted stock unit award. Employee Stock Purchase Rights and Stock Options Employee Stock Purchase Rights During the three months ended March 31, 2024 and 2023, there were no shares of common stock purchased under the ESPP. The fair values of employee stock purchase rights were estimated using the Black-Scholes option pricing model at their respective grant date using the following assumptions:
|  |  | Three Months Ended March 31,
|  |  |  |  | 2024 |  | 2023
Weighted-average grant date fair value per share |  |  |  |  | $ | 6.35 |  |  | $ | 11.97 |
Risk-free interest rate |  |  |  |  | 5.41 | % |  | 4.54 | %
Dividend yield |  |  |  |  | — | % |  | — | %
Expected life (in years) |  |  |  |  | 0.50 |  | 0.50
Volatility |  |  |  |  | 70.46 | % |  | 59.78 | %
The risk-free interest rate assumption was based on rates for United States (U.S.) Treasury zero-coupon bonds with maturities similar to those of the expected term of the award being valued. The assumed dividend yield was based on the Company’s expectation of not paying dividends in the foreseeable future. The expected term is the duration of the offering period for each grant date. In addition, the estimated volatility incorporates the historical volatility over the expected term based on the Company’s daily closing stock prices. Stock Options A summary of the Company’s stock options activity is as follows:
| Number of Options (in thousands) |  | Weighted-Average Exercise Price |  | Weighted-Average Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2023 | 375 |  |  | $ | 17.29 |  |  |  |  |
Granted | 2,688 |  |  | 19.45 |  |  |  |  |
Exercised | (39) |  |  | 7.68 |  |  |  |  |
Canceled | (1) |  |  | 23.75 |  |  |  |  |
Outstanding at March 31, 2024 | 3,023 |  |  | $ | 19.33 |  |  | 8.95 |  | $ | 4,493 |
Vested and expected to vest at March 31, 2024 | 3,023 |  |  | $ | 19.33 |  |  | 8.95 |  | $ | 4,493 |
Exercisable at March 31, 2024 | 335 |  |  | $ | 18.40 |  |  | 1.36 |  | $ | 811 |
The fair values of stock options were estimated using the Black-Scholes option pricing model at their respective grant date using the following assumptions:
|  |  | Three Months Ended March 31,
|  |  |  |  | 2024 |  | 2023(1)
Weighted-average grant date fair value per share |  |  |  |  | $10.84 - $11.24 |  | N/A
Risk-free interest rate |  |  |  |  | 4.33 | % |  | N/A
Dividend yield |  |  |  |  | — | % |  | N/A
Expected life (in years) |  |  |  |  | 6.50 |  | N/A
Volatility |  |  |  |  | 57.50 | % |  | N/A
__________________ (1) No options were granted during the three months ended March 31, 2023. The risk-free interest rate assumption was based on the United States Treasury’s rates for U.S. Treasury zero-coupon bonds with maturities similar to those of the expected term of the award being valued. The assumed dividend yield was based on the Company’s expectation of not paying dividends in the foreseeable future. The expected term of the options was calculated using the simplified method as prescribed by guidance provided by the SEC. This decision was based on the lack of historical data due to the Company’s limited number of stock option exercises under the 2010 Equity Incentive Plan. Estimated volatility incorporates historical volatility of the Company over the expected term based on the Company's daily closing stock prices. The intrinsic value of stock options exercised was $0.5 million and $0.1 million in the three months ended March 31, 2024 and 2023, respectively. Cash received from exercise of stock options was negligible during each of the three months ended March 31, 2024 and 2023. The tax benefit from stock options exercised was $0.8 million and $0.1 million during the three months ended March 31, 2024 and 2023, respectively.

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