| Document And Entity Information | Jun. 02, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jun. 02, 2023 |
| Entity Registrant Name | Acorda Therapeutics, Inc. |
| Entity Central Index Key | 0001008848 |
| Entity Emerging Growth Company | false |
| Securities Act File Number | 001-31938 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 13-3831168 |
| Entity Address, Address Line One | 2 Blue Hill Plaza |
| Entity Address, Address Line Two | 3rd Floor |
| Entity Address, City or Town | Pearl River |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10965 |
| City Area Code | 914 |
| Local Phone Number | 347-4300 |
| Entity Information, Former Legal or Registered Name | Not Applicable |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.001 per share |
| Trading Symbol | ACOR |
| Security Exchange Name | NASDAQ |
