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Debt - Schedule of Maturities of Term Facility (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total $ 77,211 $ 83,592
Term facility    
Debt Instrument [Line Items]    
2018 4,000  
2019 4,500  
2020 6,500  
2021 8,600  
2022 55,400  
Total $ 79,000