| Document and Entity Information | Mar. 04, 2024 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001388658 |
| Document Type | 8-K |
| Document Period End Date | Mar. 04, 2024 |
| Entity Registrant Name | iRhythm Technologies, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-37918 |
| Entity Tax Identification Number | 20-8149544 |
| Entity Address, Address Line One | 699 8th Street |
| Entity Address, Address Line Two | Suite 600 |
| Entity Address, City or Town | San Francisco |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94103 |
| City Area Code | (415) |
| Local Phone Number | 632-5700 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, Par Value $0.001 Per Share |
| Trading Symbol | IRTC |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
