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Other Long-Term Debt - Summary of Other Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Less current portion $ (4,616) $ (306)
Other long-term debt, less current portion   4,616
Promissory Note    
Debt Instrument [Line Items]    
Other long-term debt, Total $ 4,616 $ 4,922