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Financial Instruments with Concentrations of Credit Risk - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Allowance for doubtful accounts receivable	$ 0.3	$ 0.2
Government Contracts Concentration Risk | Revenue from Contract with Customer Benchmark | U.S. Government
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk percentage	75.00%	76.00%	76.00%
Customer Concentration Risk | Revenue from Contract with Customer Benchmark | Utility Customers
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk percentage	14.00%	14.00%	14.00%
Customer Concentration Risk | Accounts Receivable | U.S. Government
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk percentage	63.00%	68.00%
Customer Concentration Risk | Accounts Receivable | Utility Customers
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk percentage	21.00%	15.00%

X

- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
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+ Details

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Balance Type:	credit
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X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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