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Restructuring, Impairment and Other Costs of Terminated Program - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2022 employee | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2022 employee
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Impairment expense for facilities |  | $ 1.2 |  |  |  |
Measurement Input, Market Participant Subtenant Borrowing Rate |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Operating lease, measurement input |  |  |  | 6.40% |  |
Nektar 214 | Bristol Myers Squibb Company |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Reimbursement of expenses |  | $ 8.3 |  | $ 16.7 |  |
Nektar 214 | Research and Development Expense | Bristol Myers Squibb Company |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Reimbursement of expenses |  |  | $ 24.3 | $ 24.9 | $ 76.5 |
Employee Severance |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Workforce termination, percentage | 70.00% |  |  |  |  |
Number of employees | employee | 225 |  |  |  |  | 735

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- Definition The adjustment to reduce the value of existing agreements that specify the lessee's rights to use the leased property. This expense is charged when the estimates of future profits generated by the leased property are reduced. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126905981&loc=d3e2420-110228 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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