Cover
Cover - USD ($) $ in Millions | 12 Months Ended | ||
Dec. 31, 2023 | Apr. 09, 2024 | Jun. 30, 2023 | |
Cover [Abstract] | |||
Document Type | 10-K/A | ||
Document Annual Report | true | ||
Document Period End Date | Dec. 31, 2023 | ||
Current Fiscal Year End Date | --12-31 | ||
Document Transition Report | false | ||
Entity File Number | 001-37449 | ||
Entity Registrant Name | ALPINE IMMUNE SCIENCES, INC. | ||
Entity Incorporation, Date of Incorporation | DE | ||
Entity Tax Identification Number | 20-8969493 | ||
Entity Address, Address Line One | 188 East Blaine Street | ||
Entity Address, Address Line Two | Suite 200 | ||
Entity Address, City or Town | Seattle, | ||
Entity Address, State or Province | WA | ||
Entity Address, Postal Zip Code | 98102 | ||
City Area Code | 206 | ||
Local Phone Number | 788-4545 | ||
Title of 12(b) Security | Common Stock, par value $0.001 per share | ||
Trading Symbol | ALPN | ||
Security Exchange Name | NASDAQ | ||
Entity Well-known Seasoned Issuer | Yes | ||
Entity Voluntary Filers | No | ||
Entity Current Reporting Status | Yes | ||
Entity Interactive Data Current | Yes | ||
Entity Filer Category | Non-accelerated Filer | ||
Entity Small Business | true | ||
Entity Emerging Growth Company | false | ||
ICFR Auditor Attestation Flag | false | ||
Document Financial Statement Error Correction | false | ||
Entity Shell Company | false | ||
Entity Public Float | $ 349.1 | ||
Entity Common Stock, Shares Outstanding | 65,560,484 | ||
Documents Incorporated by Reference | None. | ||
Entity Central Index Key | 0001626199 | ||
Document Fiscal Year Focus | 2023 | ||
Document Fiscal Period Focus | FY | ||
Amendment Flag | false |
Audit Information
Audit Information | 12 Months Ended |
Dec. 31, 2023 | |
Audit Information [Abstract] | |
Auditor Name | Ernst & Young LLP |
Auditor Location | Seattle, Washington |
Auditor Firm ID | 42 |