Organization and Description of Business and Accounting Policies - Summary of Changes in Accumulated Other Comprehensive Income (Loss) - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Balance	$ (1,150)	$ (1,050)	$ (1,580)
Other comprehensive income (loss)	(155)	(25)	641
Tax effect	(15)	(75)	(111)
Balance	(1,320)	(1,150)	(1,050)
Accumulated Translation Adjustment
Balance	278	11	(145)
Other comprehensive income (loss)	242	387	224
Tax effect	(74)	(120)	(68)
Balance	446	278	11
Accumulated Defined Benefit Plans Adjustment | JAPAN
Balance	88	88	95
Other comprehensive income (loss)	(107)	(6)	(9)
Tax effect	29	6	2
Balance	10	88	88
Accumulated Defined Benefit Plans Adjustment | SWITZERLAND
Balance	(1,516)	(1,149)	(1,530)
Other comprehensive income (loss)	(290)	(406)	426
Tax effect	30	39	(45)
Balance	$ (1,776)	$ (1,516)	$ (1,149)