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Assets for Each Reportable Segment (Detail) - USD ($)
$ in Thousands
Sep. 29, 2018
Dec. 30, 2017
Segment Reporting, Asset Reconciling Item [Line Items]    
Cash, cash equivalents and investments $ 44,092 $ 42,488
Restricted cash 1,569 1,000
Deferred income taxes 4 4
Other current assets 1,201 1,001
Common property, plant and equipment 1,060 1,267
Other assets 723 743
Consolidated total assets 114,617 115,023
Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets 65,968 68,520
Operating Segments | TFE    
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets 48,961 52,156
Operating Segments | Photonics    
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets $ 17,007 $ 16,364