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Debt - Schedule of Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Secured Term Note Payable $ 7,077 $ 9,077
Insurance and Other Notes Payable 831 121
Less: Amounts due within one year (1,831) (2,621)
Long-term notes payable, net of current portion $ 6,077 $ 6,577