| Document And Entity Information | May 11, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | May 11, 2021 |
| Entity Registrant Name | Recro Pharma, Inc. |
| Entity Central Index Key | 0001588972 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-36329 |
| Entity Incorporation, State or Country Code | PA |
| Entity Tax Identification Number | 26-1523233 |
| Entity Address, Address Line One | 1 E. Uwchlan Ave, Suite 112 |
| Entity Address, City or Town | Exton |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 19341 |
| City Area Code | 770 |
| Local Phone Number | 534-8239 |
| Entity Information, Former Legal or Registered Name | Not applicable |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, par value $0.01 |
| Trading Symbol | REPH |
| Security Exchange Name | NASDAQ |
