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Common Stock (Details) (USD $)
0 Months Ended
Aug. 27, 2014
Dec. 31, 2013
Common Stock (Textual)    
Share price 1.60us-gaap_SharePrice $ 2.66us-gaap_SharePrice
Warrant [Member]    
Common Stock (Textual)    
Issuance of common stock and warrants 1,562,500us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
 
Shares issued to purchase common stock 781,250onp_CommonStockIssuedToPurchaseStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember