| Cover Page | Aug. 04, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Aug. 4, 2020 |
| Entity Registrant Name | Overstock.com, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 000-49799 |
| Entity Tax Identification Number | 87-0634302 |
| Entity Address, Address Line One | 799 W. Coliseum Way |
| Entity Address, City or Town | Midvale |
| Entity Address, State or Province | UT |
| Entity Address, Postal Zip Code | 84047 |
| City Area Code | 801 |
| Local Phone Number | 947-3100 |
| 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 | OSTK |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001130713 |
| Amendment Flag | false |
