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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Prepaid expenses and other current assets      
Prepaid LNG $ 227 $ 367 $ 155
Prepaid insurance 199 174 310
Other Receivables 79 672 148
Deposits 573 578 269
Other 328 324 72
Prepaid expenses and other current assets $ 1,406 $ 2,115 $ 954