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Financial Instruments with Concentrations of Credit Risk - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Allowance for doubtful accounts receivable	$ 0.2	$ 0.2
Government Contracts Concentration Risk | Sales Revenue, Net | U.S. Government
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk percentage	76.00%	76.00%	77.00%
Customer Concentration Risk | Sales Revenue, Net | Utility Customers
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk percentage	14.00%	14.00%	13.00%
Customer Concentration Risk | Accounts Receivable | U.S. Government
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk percentage	68.00%	68.00%
Customer Concentration Risk | Accounts Receivable | Utility Customers
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk percentage	15.00%	18.00%

X

- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599

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- 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.

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