Cover - shares	3 Months Ended
	Mar. 31, 2024	Aug. 16, 2024
Cover [Abstract]
Document Type	10-Q/A
Amendment Flag	true
Amendment Description	OpGen, Inc. (the “Company”) is filing this Amendment No. 1 on Form 10-Q/A (the “Amended 10-Q”) to amend the Company’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2024 (the “Original 10-Q”), originally filed with the Securities and Exchange Commission (the “SEC”) on July 8, 2024, to amend and restate the original filing in its entirety in response to certain matters described in this explanatory note.   Subsequent to the filing of the Company’s Original 10-Q for the three months ended March 31, 2024, the Company identified an error relating to the accounting treatment of an indemnification asset in the Company’s previously issued unaudited condensed consolidated financial statements included in the Company’s Original 10-Q for the quarter ended March 31, 2024 (the “Affected Period”).   During the three months ended December 31, 2023, the Company recorded impairments to the Company’s operating lease right-of-use asset and leasehold improvement property and equipment relating to the Company’s lease in Rockville, Maryland, since the Company did not initially foresee ongoing benefits from the lease given the Company’s financial position and its inability to identify a subtenant for such space. During the three months ended March 31, 2024, the Company identified a subtenant, and as a result, recorded an indemnification asset and associated gain on lease indemnification to reflect the new subtenant’s agreement to indemnify the Company from any claims, obligations, or liabilities that may arise during their tenancy beginning on April 1, 2024. The Company subsequently determined that this accounting was incorrect and that it should continue to account for the headlease as a continuing operating lease and the lease assignment as a sublease. As a result, the Company is filing this Amended 10-Q to correct the error in the Affected Period by adjusting the following information for the three months ended March 31, 2024: (i) removing the previously recorded indemnification asset and gain on lease indemnification; and (ii) changing the accounting estimates related to the Company’s operating lease right-of-use asset and leasehold improvement property and equipment and recording a gain on impairment adjustment associated with the Rockville, Maryland office due to the identification of a subtenant in the three months ended March 31, 2024. In total, the restatement and associated change in accounting estimates resulted in an incremental loss of approximately $0.1 million.   As a result of this error, the Company determined that the previously issued unaudited condensed consolidated financial statements for the Affected Period should no longer be relied upon. All material restatement information is included in this Amended 10-Q, and we do not intend to separately amend other filings that we have previously filed with the SEC. Accordingly, investors and other readers should rely only on the financial information and other disclosures regarding the Affected Period in this Amended 10-Q and in any other future filings with the SEC, as applicable, and should not rely on any previously issued or filed reports, press releases, corporate presentations or similar communications relating to the Affected Period.   As a result of the error described above and the related restatement, the Company has identified a material weakness in its internal control over financial reporting, as described in more detail in the revised Part I – Item 4. Controls and Procedures of this Amended 10-Q. Due to the identification of a material weakness, the Company concluded that its disclosure controls and procedures and internal control over financial reporting were not effective as of March 31, 2024. A discussion of the Company’s plans to remediate this material weakness is set forth in the revised Part I – Item 4. Controls and Procedures of this Amended 10-Q.   Except as described above and the items set forth below, no other amendments are being made to the Original 10-Q. This Amended 10-Q does not reflect events occurring after the filing of the Original 10-Q or modify or update the disclosure contained therein in any way other than as required to reflect the amendments discussed above.   The Company has included in this Amended 10-Q updated certifications executed as of the date of this Amended 10-Q by the Company’s principal executive officer and principal financial officer as required by Sections 302 and 906 of the Sarbanes Oxley Act of 2002. The updated certifications are included as Exhibits 31.1, 31.2, and 32.1 to this Amended 10-Q.
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2024
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2024
Current Fiscal Year End Date	--12-31
Entity File Number	001-37367
Entity Registrant Name	OPGEN, INC.
Entity Central Index Key	0001293818
Entity Tax Identification Number	06-1614015
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	23219 Stringtown Road
Entity Address, Address Line Two	Suite 300
Entity Address, City or Town	Clarksburg
Entity Address, State or Province	MD
Entity Address, Postal Zip Code	20871
City Area Code	240
Local Phone Number	813-1260
Title of 12(b) Security	Common Stock
Trading Symbol	OPGN
Security Exchange Name	NASDAQ
Entity Current Reporting Status	No
Entity Interactive Data Current	No
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		8,355,496