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Liquidity and Management's Plans (Details) (USD $)
3 Months Ended 0 Months Ended 3 Months Ended 2 Months Ended 6 Months Ended 1 Months Ended 0 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
May 08, 2015
Sep. 30, 2014
Mar. 31, 2015
Mar. 31, 2015
Apr. 30, 2015
Dec. 31, 2014
item
Jan. 01, 2013
item
Dec. 31, 2013
Proceeds from issuance of preferred stock   $ 1,420,543us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock                
Proceeds from issuance of short term notes 500,000us-gaap_ProceedsFromNotesPayable                  
Subsequent Event | Initial public offering                    
Number of units issued under initial public offering     2,850,000opgn_StockAndWarrantsIssuedDuringPeriodSharesInitialPublicOffering
/ us-gaap_SubsequentEventTypeAxis
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/ us-gaap_SubsidiarySaleOfStockAxis
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Composition of initial public offering unit, number of shares of common stock     1opgn_InitialPublicOfferingNumberOfCommonShareForEachUnit
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/ us-gaap_SubsidiarySaleOfStockAxis
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Number of common shares that can be acquired upon exercise of each warrant     1us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
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/ us-gaap_SubsidiarySaleOfStockAxis
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Purchase price of units issued under initial public offering (in dollars per unit)     $ 6.00opgn_StockAndWarrantsIssuedDuringPeriodSharesInitialPublicOfferingPurchasePricePerUnit
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Gross proceeds from issuance of IPO     17,100,000opgn_ProceedsFromIssuanceOfUnitsUnderInitialPublicOfferingGross
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Demand notes converted to equity     2,100,000us-gaap_DebtConversionOriginalDebtAmount1
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
             
Net proceeds from issuance of IPO, after considering demand notes, underwriting discounts and commissions and offering expenses     12,800,000opgn_ProceedsFromIssuanceOfUnitsUnderInitialPublicOfferingNet
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
             
Subsequent Event | Initial public offering | Sales and marketing activities                    
Net proceeds from issuance of IPO, after considering demand notes, underwriting discounts and commissions and offering expenses     5,000,000opgn_ProceedsFromIssuanceOfUnitsUnderInitialPublicOfferingNet
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Subsequent Event | Initial public offering | Research and development                    
Net proceeds from issuance of IPO, after considering demand notes, underwriting discounts and commissions and offering expenses     4,000,000opgn_ProceedsFromIssuanceOfUnitsUnderInitialPublicOfferingNet
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Subsequent Event | Initial public offering | Common stock                    
Common stock shares issued on conversion     7,374,864us-gaap_ConversionOfStockSharesIssued1
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Convertible Notes Payable | 2014 Convertible Notes                    
Proceeds from issuance of convertible notes       1,500,000us-gaap_ProceedsFromOtherShortTermDebt
/ us-gaap_DebtInstrumentAxis
= opgn_ConvertibleNotes2014Member
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= us-gaap_ConvertibleNotesPayableMember
           
Convertible Notes Payable | 2015 Convertible Notes                    
Proceeds from issuance of convertible notes         1,500,000us-gaap_ProceedsFromOtherShortTermDebt
/ us-gaap_DebtInstrumentAxis
= opgn_ConvertibleNotes2015Member
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
         
Short-term Demand Notes                    
Proceeds from issuance of short term notes           2,300,000us-gaap_ProceedsFromNotesPayable
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= us-gaap_LoansPayableMember
       
Repayments of notes 300,000us-gaap_RepaymentsOfNotesPayable
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Short-term Demand Notes | Subsequent Event                    
Proceeds from issuance of short term notes             100,000us-gaap_ProceedsFromNotesPayable
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Unsecured Promissory Note | Subsequent Event                    
Proceeds from issuance of short term notes             200,000us-gaap_ProceedsFromNotesPayable
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= opgn_UnsecuredPromissoryNoteMember
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Series A Preferred Stock                    
Number of preferred stock offerings               2opgn_NumberOfPreferredStockOfferings
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2opgn_NumberOfPreferredStockOfferings
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Proceeds from issuance of preferred stock               4,000,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
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4,000,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
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Demand notes converted to equity                   $ 1,999,864us-gaap_DebtConversionOriginalDebtAmount1
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Common stock shares issued on conversion 1us-gaap_ConversionOfStockSharesIssued1
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