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Debt - Principal Maturities of Long-Term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
2018 $ 0  
2019 4,999  
Principal balance outstanding 4,999  
less: unamortized discount (108)  
less: unamortized debt issuance costs (12)  
Long-term debt 4,879 $ 4,855
Current portion 776 0
Noncurrent portion $ 4,103 $ 4,855