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Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) $ / shares $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Jan. 01, 2022 USD ($) $ / shares shares | Jan. 02, 2021 $ / shares $ / shares | Jan. 02, 2021 USD ($) $ / shares shares | Dec. 28, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Reversal of previously recognized stock-based compensation expense related to forfeited awards |  |  |  |  | $ 900 |
Intrinsic value of stock options exercised |  | $ 300 |  |  |  |
Employee share purchase plan |  | $ 575 | $ 583 |  | $ 462 |
Stock Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options, Granted | shares |  | 1,800,007 |  |  |  | 1,222,243
Exercise price of stock option to purchase one common share | $ / shares |  | $ 5.91 |  |  |  |
Weighted-average grant-date fair value of options | $ / shares |  | $ 3.49 | $ 8.1 |  | $ 2.52 |
Compensation costs related to awards not yet recognized | $ 5,400 | $ 5,400 |  |  |  |
Vesting period |  | 2 years 2 months 12 days |  |  |  |
Trading price | $ / shares | $ 5.91 | $ 5.91 | $ 14.77 | $ 4.64 | $ 4.64 |
Expected life of options (years) |  | 6 years | 6 years |  | 6 years |
Employee share purchase plan |  | $ 600 | $ 600 |  | $ 500 |
Employee stock purchase plan (in shares) | shares |  | 87,850 | 66,834 |  | 113,581 |
Common Shares remained available to be granted | shares | 546,232 | 546,232 |  |  |  |
Percentage of vesting PSU's |  |  |  |  |  | 100.00%
Restricted stock units ("RSUs") [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options, Granted | shares |  | 466,945 |  |  |  | 840,438
Weighted-average grant-date fair value of options | $ / shares |  | $ 6.4 | $ 13.54 |  | $ 3.2 |
Compensation costs related to awards not yet recognized | $ 3,100 | $ 3,100 |  |  |  |
Vesting period |  | 1 year 9 months 18 days |  |  |  |
Intrinsic value | 3,800 | $ 3,800 |  |  |  |
Percentage of vesting PSU's |  | 100.00% |  |  |  |
Performance Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options, Granted | shares |  | 1,846,196 |  |  |  | 2,132,352
Weighted-average grant-date fair value of options | $ / shares |  | $ 5.45 | $ 13.9 |  | $ 3.54 |
Compensation costs related to awards not yet recognized | 2,600 | $ 2,600 |  |  |  |
Vesting period |  | 3 months 18 days |  |  |  |
Intrinsic value | $ 300 | $ 300 |  |  |  |
Performance Shares [Member] | Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of vesting PSU's |  | 0.00% |  |  |  |
Performance Shares [Member] | Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of vesting PSU's |  | 200.00% |  |  |  |
Performance Shares [Member] | Fiscal Years 2019 Through 2022 [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options, Granted | shares |  |  |  |  |  | 1,066,176
Performance Shares [Member] | Vest upon Common Shares achieving certain volume-weighted average trading prices [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options, Granted | shares |  |  |  |  |  | 1,066,176
Total Shareholder Return Performance Share Units [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options, Granted | shares |  | 547,071 |  |  |  |
Weighted-average grant-date fair value of options | $ / shares | $ 8.48 |  |  | $ 23.4 |  |
Vesting period |  | 2 years 2 months 12 days |  |  |  |
Intrinsic value | $ 4,200 | $ 4,200 |  |  |  |
2013 Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of securities remained available for issuance under the Plan | shares | 114,398 | 114,398 |  |  |  |

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