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Stock-Based Compensation | 12 Months Ended
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Dec. 26, 2020
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 26, 2020 |  | December 28, 2019 |  | December 29, 2018
Weighted average grant date per share fair value of RSUs granted | $ | 25.96 |  |  | $ | 15.12 |  |  | $ | 13.79 |
Total intrinsic value of stock options exercised | 4,688 |  |  | 1,814 |  |  | 631 |
Fair value of RSUs vested | $ | 42,597 |  |  | $ | 23,450 |  |  | $ | 17,541 |
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 26, 2020 |  | December 28, 2019 |  | December 29, 2018
Stock-based compensation expense included in: |  |  |  |  |
Cost of revenues | $ | 3,951 |  |  | $ | 4,055 |  |  | $ | 3,525 |
Research and development | 5,824 |  |  | 6,367 |  |  | 5,398 |
Selling, general and administrative | 14,055 |  |  | 12,754 |  |  | 8,904 |
Total stock-based compensation | $ | 23,830 |  |  | $ | 23,176 |  |  | $ | 17,827 |
Stock-based compensation tax benefit | $ | 4,962 |  |  | $ | 911 |  |  | $ | 453 |
Unrecognized Stock-Based Compensation Expense Unrecognized stock-based compensation expense at December 26, 2020 consisted of the following (in thousands):
|  | Unrecognized Expense |  | Weighted Average Recognition Period (Years)
Restricted stock units |  | $ | 32,122 |  |  | 2.2
Performance restricted stock units |  | 9,075 |  |  | 2.1
Employee stock purchase plan |  | 248 |  |  | 0.1
Total unrecognized stock-based compensation expense |  | $ | 41,445 |  |  | 2.2
Valuation Assumptions The following assumptions were used in estimating the fair value of PRSUs:
| Fiscal Year Ended
| December 26, 2020 |  | December 28, 2019 |  | December 29, 2018
PRSUs: |  |  |  |  |
Dividend yield | — | % |  | — | % |  | — | %
Expected volatility | 52.01 | % |  | 47.34 | % |  | 45.61 | %
Risk-free interest rate | 0.18 | % |  | 1.83 | % |  | 2.67 | %
Expected life (in years) | 2.8 |  | 3.1 |  | 2.9
The following assumptions were used in estimating the fair value of shares under the Employee Stock Purchase Plan:
| Fiscal Year Ended
| December 26, 2020 |  | December 28, 2019 |  | December 29, 2018
Employee Stock Purchase Plan: |  |  |  |  |
Dividend yield | — | % |  | — | % |  | — | %
Expected volatility | 30.4% - 74.4% |  | 36.6% - 59.5% |  | 44.9% - 48.9%
Risk-free interest rate | 0.10% - 1.54% |  | 2.04% - 2.46% |  | 0.83% - 2.22%
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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