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Goodwill and Intangible Assets - Future Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
Apr. 01, 2017
Dec. 31, 2016
Future estimated amortization expense    
2017 (nine months) $ 12  
2018 16  
2019 16  
2020 16  
2021 16  
Thereafter 52  
Net Carrying Amount $ 128 $ 132