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Stock-Based Compensation - Schedule of non-vested stock option activity (Details) - Stock Options [Member] - $ / shares	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Non-vested, beginning of year	579,700
Granted	555,092
Vested	(505,330)
Forfeited	(74,475)
Non-vested, end of year	554,987	579,700
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Non-vested, beginning of year	$ 4.14
Granted	2.52	$ 1.70	$ 3.31
Vested	4.17
Forfeited	3.77
Non-vested, end of year	$ 2.54	$ 4.14

X

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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X

- Definition

Number of non-vested options outstanding.

+ References

No definition available.

+ Details

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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X

- Definition

Number of non-vested options forfeited.

+ References

No definition available.

+ Details

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X

- Definition

Weighted average grant-date fair value of non-vested options forfeited.

+ References

No definition available.

+ Details

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- Definition

Weighted average grant-date fair value of non-vested options outstanding.

+ References

No definition available.

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- Definition

Number of options vested.

+ References

No definition available.

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- Definition

Weighted average grant-date fair value of options vested.

+ References

No definition available.

+ Details

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