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Acquisition and Related Goodwill Acquisition and Related Goodwill (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 25, 2017
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2017
Consideration        
Equity (884,890 shares of common stock at $4.02 per share)   $ 3,498 $ 0  
Recognized amounts of identifiable assets acquired and liabilities assumed        
Goodwill allocated   $ 1,719   $ 0
Infinia Technology Corporation (ITC)        
Consideration        
Cash $ 100      
Equity (884,890 shares of common stock at $4.02 per share) 3,600      
Contingent consideration 600      
Total Consideration 4,300      
Recognized amounts of identifiable assets acquired and liabilities assumed        
Core technology and know-how 3,400      
Working capital 200      
Property, plant and equipment 0      
Total identifiable net assets 3,600      
Long-term deferred tax liability 1,100      
Goodwill allocated $ 1,700      
Business combination, stock issued (in shares) 884,890      
Fair value per acquiree share (in dollars per share) $ 4.02