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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
    The Company’s property, plant and equipment consisted of the following (in thousands):
December 31,
Estimated
Useful Life
(years)		20202019
Liquefaction plants and systems
10 - 15
$40,841 $40,617 
Real property and buildings
3 - 25
1,649 1,794 
Vehicles and tanker trailers and equipment
2 - 10
47,179 46,597 
Computer and office equipment
2 - 7
532 453 
Construction in progress—191 409 
Leasehold improvements—30 31 
90,422 89,901 
Less: accumulated depreciation(38,384)(29,538)
$52,038 $60,363 
Depreciation expense for December 31, 2020 and 2019 totaled $9.0 million and $9.3 million respectively, of which all is included in the consolidated statements of operations as its own and separate line item.