Revenue - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018	Jan. 01, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Gift card redemptions during the period	$ 779	$ 743	$ 3,208	$ 3,021
Current period gift card redemptions from the unearned revenue balance at the beginning of the period			2,197	2,047
Gift cards sold during the period	$ 607	$ 600	$ 1,954	$ 1,875
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Increase to operating retained earnings due to cumulative effect adjustment					$ 34