| Document And Entity Information | Aug. 10, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Document Period End Date | Aug. 10, 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 |
| 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 |
| Amendment Description | As previously reported in a Current Report on Form 8-K, filed with the Securities and Exchange Commission (the “SEC”) on August 13, 2021 (the “Original Report”), as amended and supplemented by a Current Report on Form 8-K/A, filed with the SEC on September 10, 2021 (the “Amended Report,” and collectively with the Original Report, the “Report”), Recro Pharma, Inc. (the “Company”) entered into a Unit Purchase Agreement (the “Purchase Agreement”) by and among the Company, IriSys, LLC, a California limited liability company (“IriSys”), IriSys, Inc., a California corporation (“IriSys Parent”), Continent Pharmaceuticals U.S., Inc., a Delaware corporation, and EPS Americas Corp., a Delaware corporation (collectively, the “Sellers”), and IriSys Parent, in its capacity as the representative of the Sellers, pursuant to which the Company agreed to purchase 100% of the outstanding units of IriSys from the Sellers (the “Acquisition”). The closing of the Acquisition occurred simultaneously with the execution of the Purchase Agreement. As a result of the Acquisition, IriSys became a wholly owned subsidiary of the Company.This Current Report on Form 8-K/A (this “Amendment”) further amends and supplements the Report to include updated pro forma combined statements of operations for the nine months ended September 30, 2021. The pro forma financial information included in this Amendment has been presented for informational purposes only and is not necessarily indicative of the combined results of operations that would have been realized had the Acquisition occurred as of the date indicated, nor is it meant to be indicative of any future results of operations that the Company will achieve after the Acquisition. |
