Equity-Based Compensation - Option Activity and Changes (Detail)	9 Months Ended
	Sep. 28, 2019 $ / shares shares
Shares
Options outstanding at December 29, 2018 | shares	2,070,749
Options granted | shares	354,000
Options cancelled and forfeited | shares	(130,892)
Options exercised | shares	(72,122)
Options outstanding at September 28, 2019 | shares	2,221,735
Options exercisable at September 28, 2019 | shares	1,414,115
Weighted-Average Exercise Price
Options outstanding at December 29, 2018 | $ / shares	$ 6.76
Options granted | $ / shares	5.43
Options cancelled and forfeited | $ / shares	7.52
Options exercised | $ / shares	4.22
Options outstanding at September 28, 2019 | $ / shares	6.58
Options exercisable at September 28, 2019 | $ / shares	$ 6.67