| Document and Entity Information | Aug. 08, 2019 |
| Document and Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Aug. 8, 2019 |
| Entity Registrant Name | TABULA RASA HEALTHCARE, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-37888 |
| Entity Tax Identificatoin Number | 46-5726437 |
| Entity Address, Address Line One | 228 Strawbridge Drive, Suite 100 |
| Entity Address, City or Town | Moorestown |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 08057 |
| City Area Code | 866 |
| Local Phone Number | 648-2767 |
| Title of 12(b) Security | Common Stock, par value $0.0001 per share |
| Trading Symbol | TRHC |
| 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 |
| Entity Central Index Key | 0001651561 |
| Amendment Flag | false |
