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Assets for Each Reportable Segment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Segment Reporting, Asset Reconciling Item [Line Items]    
Cash, cash equivalents and investments $ 43,399 $ 48,238
Restricted cash 1,400 1,602
Deferred income taxes 4 3
Other current assets 1,024 997
Common property, plant and equipment 1,698 1,039
Other assets 724 871
Consolidated total assets 117,432 108,324
Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets 69,183 55,574
Operating Segments | Thin-film Equipment Segment    
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets 52,620 39,503
Operating Segments | Photonics    
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets $ 16,563 $ 16,071