| Cover | Aug. 15, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Aug. 15, 2022 |
| Entity Registrant Name | REMITLY GLOBAL, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 021-344104 |
| Entity Tax Identification Number | 83-2301143 |
| Entity Address, Address Line One | 1111 Third Avenue |
| Entity Address, Address Line Two | Suite 2100 |
| Entity Address, City or Town | Seattle |
| Entity Address, State or Province | WA |
| Entity Address, Postal Zip Code | 98101 |
| City Area Code | (888) |
| Local Phone Number | 736-4859 |
| 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 $0.0001 per share |
| Trading Symbol | RELY |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Central Index Key | 0001782170 |
| Amendment Flag | false |
