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Stock Warrants (Details Textual) (Warrant [Member], USD $)
0 Months Ended 3 Months Ended
Aug. 27, 2014
Mar. 31, 2015
Warrant [Member]
   
Stock Warrants (Textual)    
Issuance of common stock and warrants 1,562,500us-gaap_StockIssuedDuringPeriodSharesNewIssues
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Shares issued to purchase common stock 781,250onp_CommonStockIssuedToPurchaseStock
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Exercise price $ 1.70invest_InvestmentWarrantsExercisePrice
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$ 2.00invest_InvestmentWarrantsExercisePrice
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Warrants expiration date Sep. 02, 2019 Jun. 26, 2019
Warrants exercisable term 5 years  
Aggregate percentage of common stock sold under offering   2.50%onp_AggregatePercentageOfCommonStockSoldUnderOffering
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Aggregate number of shares of common stock sold   39,062us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
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Fair value of common stock sold $ 780,000us-gaap_SaleOfStockConsiderationReceivedPerTransaction
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$ 35,191us-gaap_SaleOfStockConsiderationReceivedPerTransaction
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Aggregated intrinsic value of warrants outstanding and exercisable   $ 117,188us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
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