Cover Page
Cover Page - USD ($) $ in Billions | 12 Months Ended | ||
Dec. 31, 2021 | Feb. 17, 2022 | Jun. 30, 2021 | |
Cover [Abstract] | |||
Entity Registrant Name | ARENA PHARMACEUTICALS, INC. | ||
Entity Central Index Key | 0001080709 | ||
Document Type | 10-K/A | ||
Document Period End Date | Dec. 31, 2021 | ||
Current Fiscal Year End Date | --12-31 | ||
Entity File Number | 000-31161 | ||
Document Fiscal Year Focus | 2021 | ||
Document Fiscal Period Focus | FY | ||
Amendment Flag | false | ||
Trading Symbol | ARNA | ||
Entity Common Stock, Shares Outstanding | 61,659,385 | ||
Entity Voluntary Filers | No | ||
Document Annual Report | true | ||
Document Transition Report | false | ||
Entity Address, Postal Zip Code | 84060 | ||
Entity Tax Identification Number | 23-2908305 | ||
Local Phone Number | 453.7200 | ||
City Area Code | 858 | ||
Entity Incorporation, State or Country Code | DE | ||
Entity Address, Address Line One | 136 Heber Avenue | ||
Entity Address, Address Line Two | Suite 204 | ||
Entity Address, City or Town | Park City | ||
Entity Address, State or Province | UT | ||
Title of 12(b) Security | Common Stock, par value $0.0001 per share | ||
Security Exchange Name | NASDAQ | ||
Entity Well-known Seasoned Issuer | Yes | ||
Entity Current Reporting Status | Yes | ||
Entity Interactive Data Current | Yes | ||
Entity Shell Company | false | ||
Entity Small Business | false | ||
Entity Emerging Growth Company | false | ||
ICFR Auditor Attestation Flag | true | ||
Documents Incorporated by Reference | None. | ||
Entity Filer Category | Large Accelerated Filer | ||
Entity Public Float | $ 4.2 |
Audit Information
Audit Information | 12 Months Ended |
Dec. 31, 2021 | |
Audit Information [Abstract] | |
Auditor Name | KPMG LLP |
Auditor Location | San Diego, CA |
Auditor Firm ID | 185 |