(Loss) Earnings Per Share - Schedule of Basic and Diluted Net Income per Share Data (Detail) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 16, 2020	Mar. 24, 2020	Jun. 18, 2019	Mar. 26, 2019	Jun. 16, 2020	Jun. 18, 2019
Net (loss) income
Net (loss) income	$ (576,000)	$ (102,468,000)	$ 2,092,000	$ 1,425,000	$ (103,044,000)	$ 3,517,000
Weighted-average shares outstanding - diluted
Weighted-average shares outstanding - basic (in shares)	37,086,962		36,821,728		37,081,511	36,988,853
Weighted-average shares outstanding - diluted	37,086,962		37,083,799		37,081,511	37,215,059
Net (loss) income per share - basic (in dollars per share)	$ (0.02)		$ 0.06		$ (2.78)	$ 0.10
Net (loss) income per share - diluted (in dollars per share)	$ (0.02)		$ 0.06		$ (2.78)	$ 0.09
Antidilutive stock options, unvested restricted stock awards, unvested RSUs and warrants excluded from the computations (in dollars per share)	6,618,810		5,865,601		6,612,770	6,205,932
Warrants and Rights Outstanding	$ 5,105,982				$ 5,105,982
Restricted Stock and RSUs
Weighted-average shares outstanding - diluted
Dilutive effect (in shares)	0		254,317		0	221,626
Stock Options
Weighted-average shares outstanding - diluted
Dilutive effect (in shares)	0		7,754		0	4,580
Warrants
Weighted-average shares outstanding - diluted
Dilutive effect (in shares)	0		0		0	0