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Revenue (Tables)
 6 Months Ended
Jun. 30, 2021
Revenue from Contract with Customer [Abstract]  
Summary of Sales from Contracts with Customers Disaggregated by Categories
The following table presents the Company’s sales from contracts with customers disaggregated by categories which best represent how the nature, amount, timing and uncertainty of sales are affected by economic factors.
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Revenue by customer
Related party
$6,268 $4,493 $13,093 $9,891 
Commercial
56 12 71 48 
Total Revenue by customer
$6,324 $4,505 $13,164 $9,939 
Revenue by contract type
Fixed-price
$873 $1,066 $1,688 $2,025 
Cost-plus
3,925 2,758 8,215 6,191 
Time and Material
1,526 681 3,261 1,723 
Total Revenue by contract type
$6,324 $4,505 $13,164 $9,939