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Note 9 - Stock-based Compensation | 9 Months Ended
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Sep. 26, 2020
Notes to Financial Statements |
Share-based Payment Arrangement [Text Block] | Note 9 - Stock-Based Compensation Total stock-based compensation expense included in our Consolidated Statements of Operations is presented in the following table:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 26, |  |  | September 28, |  |  | September 26, |  |  | September 28, |
(In thousands) |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Cost of revenue |  | $ | 834 |  |  | $ | 453 |  |  | $ | 2,322 |  |  | $ | 982 |
Research and development |  |  | 2,633 |  |  |  | 1,658 |  |  |  | 7,461 |  |  |  | 4,029 |
Selling, general, and administrative |  |  | 7,021 |  |  |  | 3,569 |  |  |  | 20,445 |  |  |  | 8,324 |
Total stock-based compensation |  | $ | 10,488 |  |  | $ | 5,680 |  |  | $ | 30,228 |  |  | $ | 13,335 |
Market-Based and Performance-Based Stock Compensation In 2018 and 2019, we granted awards of RSUs with either a market condition or a performance condition to certain executives, as described in our 2019 10-K. During the first quarter of fiscal 2020, the Board of Directors approved a modification to the market condition measurement periods associated with the unvested portions of certain of the Company’s awards with a market condition that were granted prior to fiscal 2020. The modification extended the duration of the measurement period by adjusting the beginning date of each measurement period to the original grant date, resulting in approximately $1.8 million additional stock compensation expense during the first quarter of fiscal 2020. In the first quarter of fiscal 2020, we granted awards of RSUs with a market condition to certain executives. Under the terms of these grants, the RSUs with a market condition vest and become payable over a three-year period based on the Company’s total shareholder return ("TSR") relative to the Russell 2000 index, which condition is tested for one-half of the grants on the second and third anniversary of the grant date. If the 75th percentile of the market condition is achieved, the awards may vest at 250% or 200%, depending upon the executive, with 100% of the units vesting at the 55th percentile, zero vesting if relative TSR is below the 25th percentile, and vesting scaling for achievement between the 25th and 75th percentile. During the third quarter of fiscal 2020, the market condition for awards granted in previous years exceeded the 75th percentile of the condition, and one-third of these awards vested at 250% or 200%, as applicable for the respective executive. During the second quarter of fiscal 2020, the first tranche of 33.3% of the base number of the awards with an EBITDA performance condition vested, as the Company had generated the specified "adjusted" EBITDA levels on a trailing four quarter basis for two consecutive trailing four-quarter periods as of the end of the previous quarter. During the first quarter of fiscal 2020, the market condition for awards granted to certain executives in the first quarter of fiscal 2019 exceeded the 75th percentile of the condition, and the first tranche of these awards vested at 200%. For our awards with a market condition or a performance condition, we incurred stock compensation expense, including the effect of the modification in the first quarter of fiscal 2020, of approximately $5.6 million and $0.9 million in the third quarter of fiscal 2020 and 2019, respectively, and of approximately $16.5 million and $2.9 million in the first nine months of fiscal 2020 and 2019, respectively, which is recorded as a component of total stock-based compensation expense. The following table summarizes the activity for our awards with a market condition or performance condition:
(Shares in thousands) |  | Total |
Balance, December 28, 2019 |  |  | 1,163 |
Granted |  |  | 349 |
Effect of vesting multiplier |  |  | 440 |
Vested |  |  | (816 | )
Cancelled |  |  | (14 | )
Balance, September 26, 2020 |  |  | 1,122 |

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