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Line of Credit, Long-Term Debt and Capital Lease Obligations - Schedule of Capital Lease Obligations (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
Capital lease obligations $ 1,826 $ 3,550
Less: Current portion (1,401) (2,054)
Long-term portion $ 425 $ 1,496