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Assets for Each Reportable Segment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Jan. 02, 2016
Segment Reporting, Asset Reconciling Item [Line Items]    
Cash and investments $ 48,238 $ 46,627
Restricted cash 1,602 1,780
Deferred income taxes 3 12
Other current assets 997 1,052
Common property, plant and equipment 1,039 1,218
Other assets 871 1,435
Consolidated total assets 108,324 97,681
Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets 55,574 45,557
Operating Segments | Thin-film Equipment Segment    
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets 39,503 29,528
Operating Segments | Photonics    
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets $ 16,071 $ 16,029