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Revenue - Summary of Sales from Contracts with Customers Disaggregated by Categories (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 8,317	$ 6,966
Fixed-price
Disaggregation of Revenue [Line Items]
Revenues	1,732	1,888
Cost-plus
Disaggregation of Revenue [Line Items]
Revenues	4,290	3,434
Time and Material
Disaggregation of Revenue [Line Items]
Revenues	2,295	1,644
Related party
Disaggregation of Revenue [Line Items]
Revenues	6,939	5,484
Commercial
Disaggregation of Revenue [Line Items]
Revenues	$ 1,378	$ 1,482

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No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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