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Revenue Recognition - Schedule of Revenue Disaggregated by Source (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues | $ 11,095 | $ 8,691 | $ 24,070 | $ 18,565 | $ 37,342 | $ 20,447
LNG Product [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues | 8,699 | 7,047 | 18,953 | 14,898 | 30,200 | 15,534
Rental Service And Other [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues | $ 2,396 | $ 1,644 | $ 5,117 | $ 3,667 | $ 7,142 | $ 4,913

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