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Acquisitions (Details) - USD ($)
$ in Thousands
Nov. 13, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Estimated fair value of identifiable assets acquired and liabilities assumed:        
Goodwill, deductible   $ 446 $ 426 $ 0
Alveda Acquisition        
Business Acquisition [Line Items]        
Fair value of total consideration transferred $ 35,418      
Acquisition-related costs 2,256      
Estimated fair value of identifiable assets acquired and liabilities assumed:        
Accounts receivable 911      
Inventories 2,673      
Prepaid expenses and other current assets 4      
Property and equipment 6      
Goodwill, deductible 440      
Accounts payable and other assumed liabilities (661)      
Deferred tax liability (244)      
Alveda Acquisition | Technology        
Estimated fair value of identifiable assets acquired and liabilities assumed:        
Property and equipment 24,858      
Alveda Acquisition | In-process research and development (IPR&D)        
Estimated fair value of identifiable assets acquired and liabilities assumed:        
Property and equipment 3,816      
Alveda Acquisition | Customer relationships        
Estimated fair value of identifiable assets acquired and liabilities assumed:        
Property and equipment $ 3,615