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Contractual Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2017 $ 705    
2018 489    
2019 357    
2020 43    
2021 44    
2022 4    
Total 1,642    
Rent expense $ 2,400 $ 2,300 $ 2,000