| Document And Entity Information | Oct. 01, 2021 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 1, 2021 |
| Entity Registrant Name | Inari Medical, Inc. |
| Entity Central Index Key | 0001531048 |
| Entity Emerging Growth Company | true |
| Entity File Number | 001-39293 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 45-2902923 |
| Entity Address, Address Line One | 6001 Oak Canyon, Suite 100 |
| Entity Address, City or Town | Irvine |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92618 |
| City Area Code | (877) |
| Local Phone Number | 923-4747 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Ex Transition Period | false |
| Title of 12(b) Security | Common stock, $0.001 par value |
| Trading Symbol | NARI |
| Security Exchange Name | NASDAQ |
| Former Address [Member] | |
| Document Information [Line Items] | |
| Entity Address, Address Line One | 9 Parker, suite 100 |
| Entity Address, City or Town | Irvine |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92618 |
