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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Mar. 25, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Entity Central Index Key 0001293818    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Document Transition Report false    
Entity File Number 001-37367    
Entity Registrant Name OPGEN, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 06-1614015    
Entity Address, Address Line One 9717 Key West Avenue    
Entity Address, City or Town Rockville    
Entity Address, State or Province MD    
Entity Address, Postal Zip Code 20850    
City Area Code 240    
Local Phone Number 813-1260    
Title of 12(b) Security Common Stock    
Trading Symbol OPGN    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 86,778,295
Entity Common Stock, Shares Outstanding   46,557,750  
Documents Incorporated by Reference

Portions of the registrant’s definitive Proxy Statement to be filed with respect to its 2022 Annual Meeting of Stockholders are incorporated herein by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. The proxy statement will be filed with the Securities and Exchange Commission within 120 days after the registrant’s fiscal year ended December 31, 2021.

   
Auditor Name CohnReznick LLP    
Auditor Location Tysons, Virginia    
Auditor Firm Id 596