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Note 8 - Stock-based Compensation | 6 Months Ended
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Jul. 03, 2022
Notes to Financial Statements |
Share-Based Payment Arrangement [Text Block] | Note 8 — Stock-Based Compensation Stock-based compensation expense included in the Company's consolidated financial statements for the three and six months ended July 3, 2022 and July 4, 2021 was as follows (in thousands):
|  | Three Months Ended |  |  | Six Months Ended |
|  | July 3, 2022 |  |  | July 4, 2021 |  |  | July 3, 2022 |  |  | July 4, 2021 |
Cost of revenue |  | $ | 117 |  |  | $ | 18 |  |  | $ | 173 |  |  | $ | 54 |
Research and development |  |  | 91 |  |  |  | 82 |  |  |  | 176 |  |  |  | 239 |
Selling, general and administrative |  |  | 269 |  |  |  | 102 |  |  |  | 511 |  |  |  | 277 |
Total |  | $ | 477 |  |  | $ | 202 |  |  | $ | 860 |  |  | $ | 570 |
There was no stock-based compensation expense reversal related to the cancellation of certain unvested performance-based RSUs for the three and six months ended July 3, 2022 and July 4, 2021. No stock-based compensation was capitalized during any period presented above. No stock options were granted during the three and six months ended July 3, 2022 and July 4, 2021. Stock-Based Compensation Award Activity The following table summarizes the activity in the shares available for grant under the 2019 Plan during the six months ended July 3, 2022 (in thousands):
| Shares Available for Grants |
Balance at January 2, 2022 |  | 594 |
Authorized |  | 908 |
RSUs granted |  | (99 | )
RSUs forfeited or expired |  | 18 |
Balance at July 3, 2022 |  | 1,421 |
Stock Options The following table summarizes stock options outstanding and stock option activity under the 2009 Plan and the 2019 Plan, and the related weighted average exercise price for the six months ended July 3, 2022:
|  |  |  |  |  | Weighted |  |  | Weighted |  |  |  |  |
|  |  |  |  |  | Average |  |  | Average |  |  | Aggregate |
|  | Number of |  |  | Exercise |  |  | Remaining |  |  | Intrinsic |
|  | Shares |  |  | Price |  |  | Term |  |  | Value |
|  | (in thousands) |  |  |  |  |  |  | (in years) |  |  | (in thousands) |
Balance outstanding at January 2, 2022 |  |  | 93 |  |  | $ | 27.49 |  |  |  |  |  |  |  |  |
Expired |  |  | (9 | ) |  | $ | 48.03 |  |  |  |  |  |  |  |  |
Balance outstanding at July 3, 2022 |  |  | 84 |  |  | $ | 25.42 |  |  |  | 2.94 |  |  | $ | — |
Exercisable at July 3, 2022 |  |  | 84 |  |  | $ | 25.42 |  |  |  | 2.94 |  |  | $ | — |
Vested and expected to vest at July 3, 2022 |  |  | 84 |  |  | $ | 25.42 |  |  |  | 2.94 |  |  | $ | — |
No stock options were granted, exercised, forfeited or expired during the six months ended July 3, 2022 and July 4, 2021. Total stock-based compensation related to stock options was $0 during the six months ended July 3, 2022 and July 4, 2021. As of July 3, 2022, the fair value of unvested stock options, net of forfeitures, was $0. Restricted Stock Units The Company grants restricted stock units (“RSUs”) and performance restricted stock units ("PRSUs") to employees and directors with various vesting terms. RSUs entitle the holder to receive, at no cost, one common share for each RSU as it vests. In general, the Company's policy is to withhold shares in settlement of employee tax withholding obligations upon the vesting of RSUs. The stock-based compensation expense related to RSUs and PRSUs was approximately $0.5 million and $0.9 million for the three and six months ended July 3, 2022, respectively, and approximately $0.2 million and $0.6 million for the three and six months ended July 4, 2021, respectively. As of July 3, 2022 and July 4, 2021, there was approximately $1.1 million and $0.2 million, respectively, in unrecognized compensation expense related to RSUs. The remaining unrecognized stock-based compensation expense as of July 3, 2022 is expected to be recorded over a weighted average period of 1.47 years. A summary of activity for the Company's RSUs and PRSUs for the six months ended July 3, 2022 is as follows:
| RSUs & PRSUs Outstanding
|  |  |  | Weighted
|  |  |  | Average
| Number of |  | Grant Date
| Shares |  | Fair Value
| (in thousands) |  |  |
Nonvested at January 2, 2022 |  | 568 |  | $ | 5.86
Granted |  | 99 |  |  | 5.51
Vested |  | (229 | ) |  | 5.95
Forfeited |  | (22 | ) |  | 5.09
Nonvested at July 3, 2022 |  | 416 |  | $ | 5.78
Employee Stock Purchase Plan Total stock-based compensation related to the Company's Employee Stock Purchase Plan was approximately $11 thousand and $34 thousand for the three and six months ended July 3, 2022, respectively, and $36 thousand and $66 thousand for the three and six months ended July 4, 2021, respectively.

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