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Assets for Each Reportable Segment (Detail) - USD ($)
$ in Thousands
Apr. 02, 2016
Jan. 02, 2016
Segment Reporting, Asset Reconciling Item [Line Items]    
Cash, cash equivalents and investments $ 43,493 $ 46,627
Restricted cash 1,780 1,780
Deferred income taxes 12 12
Other current assets 1,039 1,052
Common property, plant and equipment 2,049 1,218
Other assets 1,435 1,435
Consolidated total assets 89,021 97,681
Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets 39,213 45,557
Operating Segments | Thin-film Equipment Segment    
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets 25,664 29,528
Operating Segments | Photonics    
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets $ 13,549 $ 16,029