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Concentration of Risks (Tables)
 12 Months Ended
Dec. 31, 2020
Risks and Uncertainties [Abstract]  
Schedule of Customers Representing Greater than 10% of Total Revenues and/or Outstanding Receivables The following table presents customers representing greater than 10% of total revenues and/or outstanding receivable as of and for the years ended December 31, 2020 and 2019 (in thousands):
 
Consolidated
Revenue
%Accounts
Receivable		%
2020:    
Customer 1$4,915 12 %$1,423 25 %
Customer 23,535 9 1,192 21 
 $8,450 21 %$2,615 46 %
2019:
Customer 1$9,270 20 %$1,172 19 %
 $9,270 20 %$1,172 19 %
LNG Segment
Revenue
%Accounts
Receivable		%
2020:    
Customer 1$4,915 12 %$1,423 28 %
Customer 23,535 9 1,192 24 
 $8,450 21 %$2,615 52 %
2019:
Customer 1$9,270 21 %$1,172 23 %
Customer 24,206 10 — — 
 $13,476 31 %$1,172 23 %
Power Delivery Segment
Revenue
%Accounts
Receivable		%
2020:    
Customer 1$527 10 %$1 1 %
Customer 296 2 112 18 
Customer 3131 3 89 14 
 $754 15 %$202 33 %
2019:
Customer 1$472 14 %$51 6 %
Customer 2407 12 103 11 
 $879 26 %$154 17 %