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Assets for Each Reportable Segment (Detail) - USD ($)
$ in Thousands
Jul. 01, 2017
Dec. 31, 2016
Segment Reporting, Asset Reconciling Item [Line Items]    
Cash, cash equivalents and investments $ 41,360 $ 48,238
Restricted cash 1,400 1,602
Deferred income taxes 4 3
Other current assets 1,230 997
Common property, plant and equipment 1,682 1,039
Other assets 716 871
Consolidated total assets 113,203 108,324
Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets 66,811 55,574
Operating Segments | Thin-film Equipment Segment    
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets 51,100 39,503
Operating Segments | Photonics    
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets $ 15,711 $ 16,071