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Stock-Based Compensation | 12 Months Ended
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Dec. 25, 2021
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation Stock-Based Compensation Expense Certain information regarding our stock-based compensation was as follows (in thousands, except per share amounts):
| Fiscal Year Ended
| December 25, 2021 |  | December 26, 2020 |  | December 28, 2019
Weighted average grant date per share fair value of RSUs granted | $ | 36.12 |  |  | $ | 25.96 |  |  | $ | 15.12 |
Total intrinsic value of stock options exercised | 3,179 |  |  | 4,688 |  |  | 1,814 |
Fair value of RSUs vested | 54,948 |  |  | 42,597 |  |  | 23,450 |
Pre-tax stock-based compensation expense by financial statement line and related tax benefit in the Consolidated Statements of Income are as follows (in thousands):
| Fiscal Year Ended
| December 25, 2021 |  | December 26, 2020 |  | December 28, 2019
Stock-based compensation expense included in: |  |  |  |  |
Cost of revenues | $ | 5,200 |  |  | $ | 3,951 |  |  | $ | 4,055 |
Research and development | 7,583 |  |  | 5,824 |  |  | 6,367 |
Selling, general and administrative | 16,601 |  |  | 14,055 |  |  | 12,754 |
Total stock-based compensation | $ | 29,384 |  |  | $ | 23,830 |  |  | $ | 23,176 |
Stock-based compensation tax benefit | $ | 6,118 |  |  | $ | 4,962 |  |  | $ | 911 |
Unrecognized Stock-Based Compensation Expense Unrecognized stock-based compensation expense at December 25, 2021 consisted of the following (in thousands):
|  | Unrecognized Expense |  | Weighted Average Recognition Period (Years)
Restricted stock units |  | $ | 36,055 |  |  | 2.2
Performance restricted stock units |  | 10,126 |  |  | 2.1
Employee stock purchase plan |  | 452 |  |  | 0.1
Total unrecognized stock-based compensation expense |  | $ | 46,633 |  |  | 2.1
Valuation Assumptions The following assumptions were used in estimating the fair value of PRSUs:
| Fiscal Year Ended
| December 25, 2021 |  | December 26, 2020 |  | December 28, 2019
PRSUs: |  |  |  |  |
Dividend yield | — | % |  | — | % |  | — | %
Expected volatility | 52.5 | % |  | 52.0 | % |  | 47.3 | %
Risk-free interest rate | 0.3 | % |  | 0.2 | % |  | 1.8 | %
Expected life (in years) | 2.9 |  | 2.8 |  | 3.1
The following assumptions were used in estimating the fair value of shares under the Employee Stock Purchase Plan:
| Fiscal Year Ended
| December 25, 2021 |  | December 26, 2020 |  | December 28, 2019
Employee Stock Purchase Plan: |  |  |  |  |
Dividend yield | — | % |  | — | % |  | — | %
Expected volatility | 33.6% - 74.4% |  | 30.4% - 74.4% |  | 36.6% - 59.5%
Risk-free interest rate | 0.1% - 1.5% |  | 0.1% - 1.5% |  | 2.0% - 2.5%
Expected life (in years) | 0.5 - 1.0 |  | 0.5 - 1.0 |  | 0.5 - 1.0

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- Definition The entire disclosure for shareholders' equity and share-based payment arrangement. Includes, but is not limited to, disclosure of policy and terms of share-based payment arrangement, deferred compensation arrangement, and employee stock purchase plan (ESPP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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