| Cover | Mar. 08, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | This Current Report on Form 8-K/A (this “Second Amendment") is being filed by TerrAscend Corp. (the “Company”) to amend its Current Report on Form 8-K (the “Original 8-K”) previously filed with the U.S. Securities and Exchange Commission (the "SEC") on March 14, 2022, as amended by the Current Report on Form 8-K/A (the “First Amendment” and, together with the Original 8-K, the “Prior 8-K”) filed with the SEC on May 24, 2022, relating to the consummation of the acquisition of Gage Growth Corp. ("Gage") on March 8, 2020. The Company is filing this Second Amendment to amend, restate and supersede in its entirety: (i) the audited consolidated financial statements of Gage for the year ended December 31, 2021, referred to in Item 9.01(a) below; and (ii) the unaudited proforma condensed combined financial statements of the Company for the year ended December 31, 2021, after giving effect to the acquisition of Gage, referred to in Item 9.01(b) below. Additionally, the Company is filing this Second Amendment to include the Independent Auditor’s Opinion on the Gage financial statements contained in Item 9.01(a) and related footnotes. This Amendment should be read in conjunction with the Prior Form 8-K and the Company's other filings with the SEC. Except as provided herein, all information in the Prior Form 8-K remains unchanged. |
| Document Period End Date | Mar. 8, 2022 |
| Entity File Number | 000-56363 |
| Entity Registrant Name | TerrAscend Corp. |
| Entity Central Index Key | 0001778129 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Incorporation, State or Country Code | A6 |
| Entity Address, Address Line One | 3610 Mavis Road |
| Entity Address, City or Town | Mississauga |
| Entity Address, State or Province | ON |
| 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 Emerging Growth Company | true |
| Entity Ex Transition Period | false |
