| Cover Page | Jun. 14, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jun. 14, 2021 |
| Entity Address, State or Province | ON |
| Entity Incorporation, State or Country Code | Z4 |
| Entity File Number | 001-38403 |
| Entity Address, Address Line One | 111 Peter Street, Suite 300 |
| Entity Address, City or Town | Toronto |
| Entity Address, Postal Zip Code | M5V 2H1 |
| City Area Code | 416 |
| Local Phone Number | 504-0004 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Shares, no par value |
| Trading Symbol | CRON |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Registrant Name | CRONOS GROUP INC. |
| Entity Central Index Key | 0001656472 |
