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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Revenue:            
Total revenues $ 11,095 $ 8,691 $ 24,070 $ 18,565 $ 37,342 $ 20,447
Costs of revenue (excludes depreciation as reported separately)            
Selling, general and administrative expenses 2,211 1,515 4,203 3,060 7,350 4,653
Depreciation expense 2,294 2,215 4,585 4,383 8,822 6,992
Total operating expenses 11,816 10,791 24,995 21,746 44,624 29,426
Other Operating Income (Loss):            
Gain on bargain purchase           27,067
Loss from equity method investments           (1,098)
Total other operating income           25,969
Income (loss) from operations (722) (2,100) (926) (3,180) (7,282) 16,990
Other Income (Expense):            
Interest income         12 4
Interest expense (296) (1,170) (608) (2,280) (4,433) (3,380)
Gain (loss) on disposal of fixed assets   (327)   162 319 (1,643)
Other income (19) 154 (63) 352 298 97
Total other expense (315) (1,343) (671) (1,765) (3,804) (4,922)
Net income (loss) (1,037) (3,444) (1,597) (4,946) (11,086) 12,068
Net income (loss) attributable to noncontrolling interests 28 (157) 207 46 (42) (716)
Net income (loss) attributable to parent (1,066) (3,287) (1,804) (4,991) (11,044) 12,784
LNG Product [Member]            
Revenue:            
Total revenues 8,699 7,047 18,953 14,898 30,200 15,534
Costs of revenue (excludes depreciation as reported separately)            
Cost of revenue 5,616 5,762 13,098 11,948 23,804 14,245
Rental Service And Other [Member]            
Revenue:            
Total revenues 2,396 1,644 5,117 3,667 7,142 4,913
Costs of revenue (excludes depreciation as reported separately)            
Cost of revenue $ 1,696 $ 1,299 $ 3,110 $ 2,355 $ 4,648 $ 3,536