| Document and Entity Information | Apr. 29, 2022 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001816581 |
| Document Type | 8-K |
| Document Period End Date | Apr. 29, 2022 |
| Entity Registrant Name | Ouster, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-39463 |
| Entity Tax Identification Number | 86-2528989 |
| Entity Address, Address Line One | 350 Treat Avenue |
| Entity Address, City or Town | San Francisco |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94110 |
| City Area Code | (415) |
| Local Phone Number | 949-0108 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock 0.0001 Par Value Per Share [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common stock, $0.0001 par value per share |
| Trading Symbol | OUST |
| Security Exchange Name | NYSE |
| Warrants To Purchase Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Warrants to purchase common stock |
| Trading Symbol | OUST WS |
| Security Exchange Name | NYSE |
