Earnings per Share - Schedule of Basic and Diluted Net Income per Share Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 26, 2019	Mar. 27, 2018
Numerator:
Net income	$ 1,425	$ 3,229
Denominator:
Weighted-average shares outstanding - basic (in shares)	37,155,978	38,441,707
Weighted-average shares outstanding - diluted	37,346,319	39,224,070
Net (loss) income per share - basic (in dollars per share)	$ 0.04	$ 0.08
Net (loss) income per share - diluted (in dollars per share)	$ 0.04	$ 0.08
Antidilutive stock options, unvested restricted stock awards, unvested RSUs and warrants excluded from the computations (in dollars per share)	6,546,264	128,048
Restricted Stock and RSUs [Member]
Denominator:
Dilutive effect (in shares)	188,934	306,583
Stock Options [Member]
Denominator:
Dilutive effect (in shares)	1,407	21,454
Warrants [Member]
Denominator:
Dilutive effect (in shares)	0	454,326