Stock-Based Compensation - Summary of Stock Option Activity (Detail)	6 Months Ended
	Jul. 01, 2017 USD ($) $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Beginning Balance, Shares | shares	101,084
Granted, Shares | shares	58,024
Exercised, Shares | shares	(32,000)
Ending Balance, Shares | shares	127,108
Options Exercisable, Shares | shares	23,271
Beginning Balance, Weighted Average Exercise Price | $ / shares	$ 29.52
Granted, Weighted Average Exercise Price | $ / shares	78.58
Exercised, Weighted Average Exercise Price | $ / shares	6.90
Ending Balance, Weighted Average Exercise Price | $ / shares	57.61
Options Exercisable, Weighted Average Exercise Price | $ / shares	$ 31.41
Ending Balance, Weighted Average Remaining Terms (years)	4 years
Options Exercisable, Weighted Average Remaining Terms (years)	3 years 1 month 6 days
Ending Balance, Aggregate Intrinsic Value | $	$ 3,198,087
Options Exercisable, Aggregate Intrinsic Value | $	$ 1,195,152