| Document And Entity Information | Nov. 29, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 29, 2022 |
| Entity Registrant Name | TerrAscend Corp. |
| Entity Central Index Key | 0001778129 |
| Entity Emerging Growth Company | true |
| Securities Act File Number | 000-56363 |
| Entity Incorporation, State or Country Code | Z4 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Address, Address Line One | 3610 Mavis Road |
| Entity Address, City or Town | Mississauga |
| Entity Address, State or Province | ON |
| Entity Address, Country | CA |
| Entity Address, Postal Zip Code | L5C 1W2 |
| City Area Code | 855 |
| Local Phone Number | 837-7295 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Ex Transition Period | false |
| Title of 12(b) Security | N/A |
| Trading Symbol | TRSSF |
| Security Exchange Name | NONE |
