Debt (Narrative) (Details)				1 Months Ended					12 Months Ended
	Jul. 10, 2020 EUR (€)	Jun. 11, 2018 USD ($)	Jun. 11, 2018 USD ($)	Jun. 17, 2020 shares	Feb. 24, 2020 $ / shares shares	Jun. 30, 2019 EUR (€)	Jun. 28, 2017 shares	Jul. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2021 EUR (€) shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2016 EUR (€)	Dec. 31, 2021 EUR (€)	Dec. 31, 2020 EUR (€)	Jul. 10, 2020 USD ($)	Jul. 09, 2020 EUR (€)	Apr. 22, 2020 USD ($)	Jun. 30, 2018 EUR (€)	Apr. 30, 2017 EUR (€)
Common Stock And Note Purchase Agreement [Line Items]
Proceeds from issuance of common stock, net of issuance costs									$ 1,483,833		$ 15,821,922
Common stock, par value | $ / shares									$ 0.01		$ 0.01
EIB [Member]
Common Stock And Note Purchase Agreement [Line Items]
Fund drawn period												36 months
Debt term												5 years
Percentage of participation percentage interest						2.10%
Fair value of debt															$ 15,800,000
Amount of outstanding borrowings									$ 25,161,855
Deferred interest payable									$ 4,775,055
EIB debt financing facility [Member]
Common Stock And Note Purchase Agreement [Line Items]
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									$ 4,799,331		$ 3,399,984
PPP [Member] | Subsidiary Note [Member]
Common Stock And Note Purchase Agreement [Line Items]
Debt instrument, face amount																	$ 259,353
Euro [Member] | EIB [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 | €										€ 22,216,012
Deferred interest payable | €													€ 4,216,012
Common Stock [Member]
Common Stock And Note Purchase Agreement [Line Items]
Stock issued during period, shares, new issues | shares									680,000	680,000	7,521,610
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								$ 5,000,000.0
Debt instrument, interest rate, stated percentage								8.00%
Debt instrument, face amount								$ 1,000,000.0
Debt term								2 years
MGHIF Financing Agreement [Member] | Second Amended and Restated Senior Secured Promissory Note [Member]
Common Stock And Note Purchase Agreement [Line Items]
Revised and extended the maturity date, payment terms									six semi-annual payments	six semi-annual payments
Annual payments plus accrued and unpaid interest		$ 166,667	$ 166,667
Beginning date of debt maturity			Jan. 02, 2019
Ending date of debt maturity			Jul. 01, 2021
Unamortized debt issuance costs		7,000	$ 7,000
MGHIF Financing Agreement [Member] | Private Placement [Member] | Common Stock [Member] | Second Amended and Restated Senior Secured Promissory Note [Member]
Common Stock And Note Purchase Agreement [Line Items]
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
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	EURIBOR plus 4% payable
First Tranche [Member] | Euro [Member] | EIB [Member]
Common Stock And Note Purchase Agreement [Line Items]
Senior unsecured Loan | €																			€ 10,000,000
Second Tranche [Member] | Euro [Member] | EIB [Member]
Common Stock And Note Purchase Agreement [Line Items]
Senior unsecured Loan | €																		€ 3,000,000
Third Tranche [Member] | Euro [Member] | EIB [Member]
Common Stock And Note Purchase Agreement [Line Items]
Senior unsecured Loan | €						€ 5,000,000										€ 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%