| Cover Page | Aug. 13, 2019 |
| Cover page. | |
| Document Type | 8-K |
| Document Period End Date | Aug. 13, 2019 |
| Entity File Number | 0-18592 |
| Entity Registrant Name | MERIT MEDICAL SYSTEMS INC |
| Entity Central Index Key | 0000856982 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | UT |
| Entity Tax Identification Number | 87-0447695 |
| Entity Address, Address Line One | 1600 West Merit Parkway |
| Entity Address, City or Town | South Jordan, |
| Entity Address, State or Province | UT |
| Entity Address, Postal Zip Code | 84095 |
| City Area Code | 801 |
| Local Phone Number | 253-1600 |
| Title of 12(b) Security | Common Stock, no par value |
| Trading Symbol | MMSI |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
