Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2024 USD ($) Segment	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Schedule Of Significant Accounting Policies [Line Items]
Number of operating segments | Segment	1
Estimated useful life	11 years
Credit losses related to available-for-sale debt securities	$ 0	$ 0	$ 0
Allowance for credit losses related to available-for-sale debt securities	0	$ 0
Essentialis, Inc. [Member]
Schedule Of Significant Accounting Policies [Line Items]
Net intangible assets acquired	$ 22,000,000
Minimum [Member]
Schedule Of Significant Accounting Policies [Line Items]
Estimated useful lives of property and equipment	3 years
Maximum [Member]
Schedule Of Significant Accounting Policies [Line Items]
Estimated useful lives of property and equipment	5 years
ASU No. 2023-07 [Member]
Schedule Of Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Oct. 01, 2024
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true