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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Property, Plant and Equipment [Line Items]
Short-term investment maturity period	3 months
Exploration license impairments	$ 0	$ 0
Asset impairment charges	$ 0	$ 0
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, estimated useful life	3 years
Furniture And Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, estimated useful life	5 years
Minimum [Member] | Marine Services Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, estimated useful life	5 years
Maximum [Member] | Marine Services Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, estimated useful life	10 years

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- Definition

Exploration license impairments.

+ References

No definition available.

+ Details

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- Definition

Short-term investments maturity period.

+ References

No definition available.

+ Details

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482130/360-10-45-4

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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.

+ Details

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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