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Debt - Schedule of Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]      
Secured Term Note Payable $ 9,077 $ 9,077 $ 11,497
Insurance and Other Notes Payable 161 121  
Less: Amounts due within one year (2,661) (2,621)  
Total Debt $ 6,577 $ 6,577 $ 4,705