Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	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