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Debt (Narrative) (Details)					1 Months Ended							12 Months Ended
Debt (Narrative) (Details)	Jul. 10, 2020 EUR (€)	Jul. 09, 2020 EUR (€)	Jul. 14, 2018 USD ($)	Jun. 11, 2018 USD ($)	Jun. 17, 2020 shares	Feb. 24, 2020 $ / shares shares	Jun. 30, 2019 EUR (€)	Jul. 30, 2018 USD ($) shares	Jun. 28, 2017 shares	Apr. 30, 2017 EUR (€)	Jul. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2020 EUR (€) shares	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2016 EUR (€)	Dec. 31, 2020 EUR (€)	Jul. 10, 2020 USD ($)	Apr. 22, 2020 USD ($)	Jun. 30, 2018 EUR (€)
Common Stock And Note Purchase Agreement [Line Items]
Proceeds from issuance of common stock, net of issuance costs												$ 15,821,922		$ 4,782,509
Common stock, par value \| $ / shares												$ 0.01		$ 0.01
Common Stock [Member]
Common Stock And Note Purchase Agreement [Line Items]
Stock issued during period, shares, new issues \| shares												7,521,610	7,521,610
EIB [Member]
Common Stock And Note Purchase Agreement [Line Items]
Fund drawn period															36 months
Percentage of participation percentage interest							2.10%
Fair value of debt																	$ 15,800,000
Amount of outstanding borrowings												$ 25,936,000
Deferred interest payable												$ 3,849,000
EIB [Member] \| Euro [Member]
Common Stock And Note Purchase Agreement [Line Items]
Senior unsecured Loan \| €															€ 25,000,000
Amount of cumulative equity capital raised \| €							€ 15,000,000
Amount of outstanding borrowings \| €													€ 21,136,768
Deferred interest payable \| €																€ 3,136,768
EIB debt financing facility [Member]
Common Stock And Note Purchase Agreement [Line Items]
Debt instrument, interest rate, stated percentage		10.00%
Debt term		5 years
Defer total interest payments \| €	€ 720,000
PPP [Member]
Common Stock And Note Purchase Agreement [Line Items]
Debt instrument, face amount																		$ 879,630
Percentage of interest accrues												1.00%	1.00%
Interest expense												$ 3,399,984		$ 187,549
PPP [Member] \| Subsidiary Note [Member]
Common Stock And Note Purchase Agreement [Line Items]
Debt instrument, face amount																		$ 259,353
MGHIF Financing Agreement [Member]
Common Stock And Note Purchase Agreement [Line Items]
Stock issued during period, shares, new issues \| shares											2,273
Shares issued, price per share \| $ / shares											$ 2,200
Proceeds from issuance of common stock, net of issuance costs											$ 5,000,000
Debt instrument, interest rate, stated percentage											8.00%
Debt instrument, face amount											$ 1,000,000
MGHIF Financing Agreement [Member] \| Second Amended and Restated Senior Secured Promissory Note [Member]
Common Stock And Note Purchase Agreement [Line Items]
Accrued and unpaid interest			$ 285,512
Revised and extended the maturity date, payment terms				Six semi-annual payments
Annual payments plus accrued and unpaid interest				$ 166,667
Beginning date of debt maturity				Jan. 02, 2019
Ending date of debt maturity				Jul. 01, 2021
Unamortized debt issuance costs				$ 7,000
MGHIF Financing Agreement [Member] \| Second Amended and Restated Senior Secured Promissory Note [Member] \| Private Placement [Member] \| Common Stock [Member]
Common Stock And Note Purchase Agreement [Line Items]
Stock issued during period, shares, new issues \| shares								7,212
Accrued and unpaid interest								$ 285,512
Accrued and unpaid interest due date								Jul. 14, 2018
Amended and Restated MGHIF Financing Agreement [Member]
Common Stock And Note Purchase Agreement [Line Items]
Debt instrument, interest rate, stated percentage									10.00%
Debt instrument, extended maturity date									Jul. 14, 2018
Issuance of common stock warrants to purchase \| shares									656
Assignment Agreement [Member] \| Convertible Note [Member]
Common Stock And Note Purchase Agreement [Line Items]
Stock issued during period, shares, new issues \| shares												763,905	763,905
Proceeds from issuance of common stock, net of issuance costs												$ 1,451,000
Common stock, par value \| $ / shares						$ 0.01
Issuance of convertible notes \| shares					450,000	500,000
Fair value of Convertible notes												$ 1,300,000
Assignment Agreement [Member] \| Convertible Note [Member] \| Euro [Member]
Common Stock And Note Purchase Agreement [Line Items]
Unconverted Convertible Notes \| €																€ 1,300,000
First Tranche [Member] \| EIB [Member]
Common Stock And Note Purchase Agreement [Line Items]
Debt instrument, interest rate, stated percentage										6.00%
Interst rate										EURIBOR plus 4% payable
First Tranche [Member] \| EIB [Member] \| Euro [Member]
Common Stock And Note Purchase Agreement [Line Items]
Senior unsecured Loan \| €										€ 10,000,000
Second Tranche [Member] \| EIB [Member] \| Euro [Member]
Common Stock And Note Purchase Agreement [Line Items]
Senior unsecured Loan \| €																			€ 3,000,000
Third Tranche [Member] \| EIB [Member] \| Euro [Member]
Common Stock And Note Purchase Agreement [Line Items]
Senior unsecured Loan \| €							5,000,000
Four Tranche [Member] \| EIB [Member] \| Euro [Member]
Common Stock And Note Purchase Agreement [Line Items]
Senior unsecured Loan \| €							€ 5,000,000
OpGen's equity value [Member] \| EIB [Member]
Common Stock And Note Purchase Agreement [Line Items]
Percentage of participation percentage interest							0.30%
Five Tranche [Member] \| EIB [Member] \| Euro [Member]
Common Stock And Note Purchase Agreement [Line Items]
Senior unsecured Loan \| €		€ 5,000,000