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License and Collaboration Agreements - Additional Information (Details)			1 Months Ended	3 Months Ended		12 Months Ended
	Feb. 12, 2024 USD ($) shares	Jul. 23, 2017 USD ($)	Apr. 30, 2018 USD ($) shares	Mar. 31, 2025 USD ($) Milestones	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2020 USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue				$ 10,460,000	$ 21,639,000
Non-cash royalty revenue related to the sales of future royalties
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue				10,460,000	$ 15,508,000
Bristol Myers Squibb Company | Purchase Agreement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Shares issued (in shares) | shares			8,284,600
Sale of stock consideration received			$ 850,000,000
Other Partner
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Potential future additional payments for development milestones				$ 40,000,000
Nektar-358 | Maximum | Eli Lilly And Company
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Potential future additional development and regulatory milestones (up to)		$ 250,000,000
Nektar 0165 | Biolojic Design Company [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Payable For Newdrug Investigle Milestone						$ 3,000,000
Number of Milestone | Milestones				0
Nektar 0165 | Maximum | Biolojic Design Company [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Potential future additional payments for development milestones						35,000,000
Payment For Development Milestones						$ 18,000,000
Bristol Myers Squibb Collaboration Agreement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Sale of stock shares repurchased | shares	8,300,000
Sale of stock repurchased cash consideration	$ 3,000,000
Nektar's | Nektar-358
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Received upfront and milestone payment		$ 150,000,000
Nektar's | Bristol Myers Squibb Collaboration Agreement | Nektar 214
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Upfront and milestone payments received from license agreements			$ 1,000,000,000
Nektar's | Bristol Myers Squibb Collaboration Agreement | Nektar 214 | Milestone One
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Potential future additional payments for development milestones							$ 50,000,000

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