| Cover | Jun. 16, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jun. 16, 2021 |
| Entity Registrant Name | The Honest Company, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-40378 |
| Entity Tax Identification Number | 90-0750205 |
| Entity Address, Address Line One | 12130 Millennium Drive |
| Entity Address, Address Line Two | #500 |
| Entity Address, City or Town | Los Angeles |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 90094 |
| City Area Code | 888 |
| Local Phone Number | 862-8818 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.0001 par value per share |
| Trading Symbol | HNST |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Central Index Key | 0001530979 |
| Amendment Flag | false |
