| Document And Entity Information | Oct. 23, 2023 |
| Document Information [Line Items] | |
| Entity, Registrant Name | HealthStream, Inc. |
| Current Fiscal Year End Date | --12-31 |
| Document, Type | 8-K |
| Document, Period End Date | Oct. 23, 2023 |
| Entity, Incorporation, State or Country Code | TN |
| Entity, File Number | 000-27701 |
| Entity, Tax Identification Number | 62-1443555 |
| Entity, Address, Address Line One | 500 11th Avenue North |
| Entity, Address, Address Line Two | Suite 1000 |
| Entity, Address, City or Town | Nashville |
| Entity, Address, State or Province | TN |
| Entity, Address, Postal Zip Code | 37203 |
| City Area Code | 615 |
| Local Phone Number | 301-3100 |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | HSTM |
| Security Exchange Name | NASDAQ |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0001095565 |
