| Document and Entity Information - USD ($) $ in Millions | 12 Months Ended | ||
| Dec. 31, 2020 | Apr. 23, 2021 | Jun. 30, 2020 | |
| Cover [Abstract] | |||
| Document Type | 10-K/A | ||
| Amendment Flag | true | ||
| Amendment Description | Tilray, Inc. (the “Company”) is filing this Amendment No. 1 to its Annual Report on Form 10-K (“Amendment”), originally filed with the Securities and Exchange Commission (the “SEC”) on February 19, 2021 (the “Initial Filing”), solely for the purposes of amending and supplementing Part III of the Annual Report on Form 10-K. This Amendment changes the Company’s Initial Filing by including information required by Part III (Items 10, Director, Executive Officers and Corporate Governance, Item11. Executive Compensation, Item12,Security Ownership of Certain Beneficial Owners and Management and Related Stockholders Matters, Item 13, Certain Relationships and Related Transactions, and Director Independence and Item14, Principal Accounting Fees and Services) because our definitive proxy statement will not be filed within 120 days after December 31, 2020, the end of the fiscal year covered by our Annual Report on Form 10-K. In addition, in connection with the filing of this Amendment, the Company is including new certifications of our principal executive officer and principal financial officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. Accordingly, Item 15, Exhibits and Financials Statement Schedules of Part IV of the Initial Filing has also been amended to reflect the filing of the new certifications. Because no financial statements are contained within this Amendment, the Company is not including certifications pursuant to Section 906 of The Sarbanes-Oxley Act of 2002. Except as contained herein, this Amendment does not modify or update disclosures contained in the Initial Filing. This Amendment should be read in conjunction with the Company’s other filings made with the SEC subsequent to the date of the Initial Filing. | ||
| Document Annual Report | true | ||
| Document Period End Date | Dec. 31, 2020 | ||
| Document Fiscal Year Focus | 2020 | ||
| Document Fiscal Period Focus | FY | ||
| Current Fiscal Year End Date | --12-31 | ||
| Document Transition Report | false | ||
| Entity File Number | 001-38594 | ||
| Entity Registrant Name | TILRAY, INC. | ||
| Entity Central Index Key | 0001731348 | ||
| Entity Incorporation, State or Country Code | DE | ||
| Entity Tax Identification Number | 82-4310622 | ||
| Entity Address, Address Line One | 1100 Maughan Road | ||
| Entity Address, City or Town | Nanaimo | ||
| Entity Address, State or Province | BC | ||
| Entity Address, Postal Zip Code | V9X 1J2 | ||
| City Area Code | 844 | ||
| Local Phone Number | 845-7291 | ||
| Title of 12(b) Security | Class 2 Common Stock, $0.0001 par value per share | ||
| Trading Symbol | TLRY | ||
| 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 | Large Accelerated Filer | ||
| Entity Small Business | false | ||
| Entity Emerging Growth Company | false | ||
| ICFR Auditor Attestation Flag | true | ||
| Entity Shell Company | false | ||
| Entity Public Float | $ 675.6 | ||
| Entity Common Stock, Shares Outstanding | 179,352,174 |
