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Significant Accounting Policies - Estimated Fair Value of Assets and Liability (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Asset:
Asset, fair value	$ 247,178	$ 235,380
Level 1
Asset:
Asset, fair value	242,178	223,218
Level 2
Asset:
Asset, fair value	5,000	12,162
Money Market Fund
Asset:
Asset, fair value	67,456	99,226
Money Market Fund | Level 1
Asset:
Asset, fair value	67,456	99,226
U.S. Treasury Shares
Asset:
Asset, fair value	174,722	123,992
U.S. Treasury Shares | Level 1
Asset:
Asset, fair value	174,722	123,992
Agency Securities
Asset:
Asset, fair value		8,912
Agency Securities | Level 2
Asset:
Asset, fair value		8,912
Repo Securities
Asset:
Asset, fair value	5,000	3,250
Repo Securities | Level 2
Asset:
Asset, fair value	$ 5,000	$ 3,250

X

- Definition

Fair value portion of asset recognized for present right to economic benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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