Geographic Assets - Composition of Long-Lived Assets (Details) - USD ($) $ in Thousands	Jan. 01, 2021	Jan. 03, 2020
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment, net	$ 24,030	$ 17,065
Finance lease ROU assets, net	596	1,867
Operating lease ROU assets, net	8,764	6,684
Intangible assets, net	270	296
Total	33,660	25,912
U.S.
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment, net	19,289	14,956
Finance lease ROU assets, net	527	1,756
Operating lease ROU assets, net	4,380	2,920
Intangible assets, net	83	83
Total	24,279	19,715
JAPAN
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment, net	420	306
Finance lease ROU assets, net	69	80
Operating lease ROU assets, net	530	919
Intangible assets, net	187	213
Total	1,206	1,518
SWITZERLAND
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment, net	4,321	1,803
Finance lease ROU assets, net		31
Operating lease ROU assets, net	3,854	2,845
Total	$ 8,175	$ 4,679