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Stockholders' Equity - Restricted Stock Units and Awards (Details) - $ / shares	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
Restricted stock units and awards
Number of Shares, Restricted stock granted	443,036	628,125
Restricted Stock Units (RSUs)
Restricted stock units and awards
Outstanding, Number of Shares, Beginning Balance	597,121	361,148
Number of Shares, Restricted stock granted	295,357	418,750
Number of Shares, Restricted stock released	(222,371)	(86,941)
Number of Shares, Restricted stock forfeited	(258,974)	(95,836)
Outstanding, Number of Shares, Ending Balance	411,133	597,121
Outstanding, Weighted Average Grant Date Fair Value, Beginning Balance	$ 9.08	$ 10.42
Weighted Average Grant Date Fair Value, Restricted stock granted	2.28	7.79
Weighted Average Grant Date Fair Value, Restricted stock released	4.32	7.38
Weighted Average Grant Date Fair Value, Restricted stock forfeited	8.41	10.01
Outstanding, Weighted Average Grant Date Fair Value, Ending Balance	$ 7.19	$ 9.08

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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X

- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

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

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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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