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Stockholders' Equity and Share-Based Compensation (Tables) | 12 Months Ended
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Jan. 01, 2022
Stockholders' Equity and Share-Based Compensation |
Estimated fair value of employee stock purchase rights under the ESPP was determined using the Black-Scholes option pricing model with the following assumptions | ​
​ | ​ | ​
​ | ​ | Fiscal Year Ended
​ | ​ | January 1, 2022
Expected life | ​ | 0.5 years
Risk-free interest rate | ​ | 0.05%
Expected volatility | ​ | 86.3%
Expected dividend yield | ​ | —%
Summary of Stock Option Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted |  | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Aggregate
​ | ​ | ​ | ​ | Exercise | ​ | Contractual | ​ | Intrinsic
​ |  | Shares |  | Price |  | Term (in years) |  | Value(1)
Options outstanding, January 2, 2021 |  | 6,932 | ​ | $ | 2.09 |  |  |  | ​ |
Granted |  | — | ​ | $ | — |  |  |  | ​ |
Exercised |  | (2,060) | ​ | $ | 1.78 |  |  |  | ​ |
Cancelled: |  |  | ​ |  |  |  |  |  | ​ |
Forfeited |  | (98) | ​ | $ | 4.69 |  |  |  | ​ |
Expired |  | (9) | ​ | $ | 2.91 |  |  |  | ​ |
Options outstanding, January 1, 2022 |  | 4,765 | ​ | $ | 2.17 |  | 7.00 | ​ | $ | 43,039
Vested and expected to vest at January 1, 2022 |  | 4,765 | ​ | $ | 2.17 |  | 7.00 | ​ | $ | 43,039
Options exercisable, January 1, 2022 |  | 2,662 | ​ | $ | 2.04 |  | 6.43 | ​ | $ | 24,389
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted |  | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Aggregate
​ | ​ | ​ | ​ | Exercise | ​ | Contractual | ​ | Intrinsic
​ |  | Shares |  | Price |  | Term (in years) |  | Value(1)
Options outstanding, December 28, 2019 |  | 7,223 | ​ | $ | 2.76 |  |  |  | ​ |
Granted |  | 2,558 | ​ | $ | 3.21 |  |  |  | ​ |
Exercised |  | (2,200) | ​ | $ | 1.94 |  |  |  | ​ |
Cancelled: |  |  | ​ |  |  |  |  |  | ​ |
Forfeited |  | (73) | ​ | $ | 4.82 |  |  |  | ​ |
Expired |  | (576) | ​ | $ | 3.69 |  |  |  | ​ |
Options outstanding, January 2, 2021 |  | 6,932 | ​ | $ | 2.09 |  | 8.10 | ​ | $ | 71,404
Vested and expected to vest at January 2, 2021 |  | 6,932 | ​ | $ | 2.09 |  | 8.10 | ​ | $ | 71,404
Options exercisable, January 2, 2021 |  | 2,591 | ​ | $ | 1.73 |  | 7.04 | ​ | $ | 27,630
(1) | These amounts represent the difference between the exercise price and the closing price of CarParts.com, Inc. common stock at the end of the respective fiscal year as reported on the NASDAQ Stock Market, for all options outstanding that have an exercise price currently below the closing price.
Summary of Assumptions Used | ​
​ | ​ | ​
​ |  | Fiscal Year Ended
​ |  | January 2, 2021
Expected life |  | 5.37 - 5.69 years
Risk-free interest rate |  | 0.3% - 1.7%
Expected volatility |  | 55.1% - 63.5%
Expected dividend yield |  | —%

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