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Selected Quarterly Financial Data - Schedule of Quarterly Financial Information (Parenthetical) (Detail) - USD ($)	3 Months Ended					12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Oct. 02, 2016	Jul. 03, 2016	Apr. 03, 2016	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Quarterly Financial Information [Line Items]
Revaluation of net deferred tax assets	$ 5,500,000
Pre-tax non-cash impairment charge	600,000					$ 602,000	$ 0	$ 192,000
Non-cash goodwill impairment charge	4,400,000					4,433,000	$ 0	$ 0
Write-offs (benefits) related to share based compensation		$ (400,000)		$ 200,000	$ 700,000
Pretax charges of store closing costs			$ 1,100,000	$ 100,000
California Enterprise Zone Tax Credits [Member]
Quarterly Financial Information [Line Items]
Provision for incomes taxes, excluding federal income tax benefit	$ 600,000					$ 900,000
Net deferred tax asset related to enactment of tax cuts and jobs act [Member]
Quarterly Financial Information [Line Items]
Increase (decrease) in net income (loss) per share	$ (0.26)
Valuation allowance related to unused California Enterprise Zone Tax Credits [Member]
Quarterly Financial Information [Line Items]
Increase (decrease) in net income (loss) per share						$ (0.03)
Impairment charge [Member]
Quarterly Financial Information [Line Items]
Increase (decrease) in net income (loss) per share	$ (0.02)
Increase (decrease) in net income (loss)	$ (400,000)
Goodwill Impairment [Member]
Quarterly Financial Information [Line Items]
Increase (decrease) in net income (loss) per share	$ (0.21)
Share based compensation [Member]
Quarterly Financial Information [Line Items]
Increase (decrease) in net income (loss) per diluted share		$ (0.02)		$ 0.01	$ 0.03
Store closing costs [Member]
Quarterly Financial Information [Line Items]
Increase (decrease) in net income (loss)			$ (700,000)	$ (60,000)
Increase (decrease) in net income (loss) per diluted share			$ (0.03)	$ 0.00

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