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Assets for Each Reportable Segment (Detail) - USD ($)
$ in Thousands
Jul. 02, 2016
Jan. 02, 2016
Segment Reporting, Asset Reconciling Item [Line Items]    
Cash, cash equivalents and investments $ 40,614 $ 46,627
Restricted cash 1,780 1,780
Deferred income taxes 3 12
Other current assets 1,147 1,052
Common property, plant and equipment 2,447 1,218
Other assets 919 1,435
Consolidated total assets 98,667 97,681
Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets 51,757 45,557
Operating Segments | Thin-film Equipment Segment    
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets 36,278 29,528
Operating Segments | Photonics    
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets $ 15,479 $ 16,029