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Significant Accounting Policies - Estimated Fair Value of Assets and Liability (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Asset:
Asset, fair value	$ 235,380	$ 192,307
Level 1
Asset:
Asset, fair value	223,218	86,541
Level 2
Asset:
Asset, fair value	12,162	105,766
Money Market Fund
Asset:
Asset, fair value	99,226	81,870
Money Market Fund | Level 1
Asset:
Asset, fair value	99,226	81,870
U.S. Treasury Shares
Asset:
Asset, fair value	123,992	3,117
U.S. Treasury Shares | Level 1
Asset:
Asset, fair value	123,992	3,117
Agency Securities
Asset:
Asset, fair value	8,912	1,554
Agency Securities | Level 1
Asset:
Asset, fair value		1,554
Agency Securities | Level 2
Asset:
Asset, fair value	8,912
Corporate Bonds
Asset:
Asset, fair value		28,416
Corporate Bonds | Level 2
Asset:
Asset, fair value		28,416
Commercial Paper
Asset:
Asset, fair value		62,347
Commercial Paper | Level 2
Asset:
Asset, fair value		62,347
Repo Securities
Asset:
Asset, fair value	3,250	3,250
Repo Securities | Level 2
Asset:
Asset, fair value	$ 3,250	3,250
Asset Backed Securities
Asset:
Asset, fair value		1,260
Asset Backed Securities | Level 2
Asset:
Asset, fair value		1,260
Certificate of Deposit
Asset:
Asset, fair value		9,100
Certificate of Deposit | Level 2
Asset:
Asset, fair value		9,100
Non-US Government
Asset:
Asset, fair value		1,393
Non-US Government | Level 2
Asset:
Asset, fair value		$ 1,393

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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