Stock-Based Compensation - Summary of Stock Option Activity (Detail)	3 Months Ended
	Apr. 01, 2017 USD ($) $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Beginning Balance, Shares | shares	101,084
Granted, Shares | shares	55,508
Exercised, Shares | shares	(32,000)
Ending Balance, Shares | shares	124,592
Options Exercisable, Shares | shares	19,671
Beginning Balance, Weighted Average Exercise Price | $ / shares	$ 29.52
Granted, Weighted Average Exercise Price | $ / shares	78.40
Exercised, Weighted Average Exercise Price | $ / shares	6.90
Ending Balance, Weighted Average Exercise Price | $ / shares	57.11
Options Exercisable, Weighted Average Exercise Price | $ / shares	$ 27.40
Ending Balance, Weighted Average Remaining Terms (years)	4 years 3 months 18 days
Options Exercisable, Weighted Average Remaining Terms (years)	3 years 2 months 12 days
Ending Balance, Aggregate Intrinsic Value | $	$ 3,117,895
Options Exercisable, Aggregate Intrinsic Value | $	$ 1,076,542