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Stockholders' Equity (Issue of Warrants to purchase shares of the Company's common stock) (Details) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Mar. 31, 2013
Jan. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Feb. 29, 2012
Jun. 30, 2011
Dec. 31, 2014
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2014
Company issued warrants to purchase unregistered shares of the Company's common stock 400,000pwvi_CompanyIssuedWarrantsToPurchaseUnregisteredSharesOfTheCompanySCommonStock   75,000pwvi_CompanyIssuedWarrantsToPurchaseUnregisteredSharesOfTheCompanySCommonStock 325,000pwvi_CompanyIssuedWarrantsToPurchaseUnregisteredSharesOfTheCompanySCommonStock 300,000pwvi_CompanyIssuedWarrantsToPurchaseUnregisteredSharesOfTheCompanySCommonStock 500,000pwvi_CompanyIssuedWarrantsToPurchaseUnregisteredSharesOfTheCompanySCommonStock 1,855,000pwvi_CompanyIssuedWarrantsToPurchaseUnregisteredSharesOfTheCompanySCommonStock   225,000pwvi_CompanyIssuedWarrantsToPurchaseUnregisteredSharesOfTheCompanySCommonStock 71,000pwvi_CompanyIssuedWarrantsToPurchaseUnregisteredSharesOfTheCompanySCommonStock 335,000pwvi_CompanyIssuedWarrantsToPurchaseUnregisteredSharesOfTheCompanySCommonStock  
Exercise price per share in association with stock subscription agreements $ 0.21pwvi_ExercisePricePerShareInAssociationWithStockSubscriptionAgreements   $ 0.41pwvi_ExercisePricePerShareInAssociationWithStockSubscriptionAgreements $ 0.41pwvi_ExercisePricePerShareInAssociationWithStockSubscriptionAgreements   $ 3.00pwvi_ExercisePricePerShareInAssociationWithStockSubscriptionAgreements $ 1.05pwvi_ExercisePricePerShareInAssociationWithStockSubscriptionAgreements   $ 1.00pwvi_ExercisePricePerShareInAssociationWithStockSubscriptionAgreements $ 3.00pwvi_ExercisePricePerShareInAssociationWithStockSubscriptionAgreements $ 3.00pwvi_ExercisePricePerShareInAssociationWithStockSubscriptionAgreements  
Warrants term           5 years 5 years          
Warrants expiration date Dec. 31, 2016   Dec. 31, 2015 Dec. 31, 2015 Dec. 31, 2017       Oct. 31, 2015 Jul. 30, 2015 Dec. 31, 2015  
Company issued its Chief Executive Officer five year warrants to purchase common stock   1,000,000pwvi_CompanyIssuedItsChiefExecutiveOfficerFiveYearWarrantsToPurchaseCommonStock                    
Company issued its Chief Financial Officer five year warrants to purchase common stock   500,000pwvi_CompanyIssuedItsChiefFinancialOfficerFiveYearWarrantsToPurchaseCommonStock                    
Company recognized an amount in compensation expense   $ 210,000pwvi_CompanyRecognizedAnAmountInCompensationExpense                    
Exercise price per share in association with stock issued to Chief Executive Officer and Chief Financial Officer   $ 0.30pwvi_ExercisePricePerShareInAssociationWithStockIssuedToChiefExecutiveOfficerAndChiefFinancialOfficer                    
Extending maturity date              

Extending the maturity date from December 31, 2015 to December 31, 2017

        
Reduced exercise price              

Exercise price was reduced from $0.41 per share to $0.39 per share

        
Revised the terms of the additional warrants              

Revised the terms of the additional warrants issued December 1, 2013, to extend the maturity date to December 31, 2018

        
Reduced exercise price the additional warrants              

Exercise price was reduced from $.21 per share to $0.17 per share

        
Weighted average grant date fair value of warrants issued                       $ 0.06pwvi_WeightedAverageGrantDateFairValueOfWarrantsIssued
Maximum [Member]                        
Exercise price per share in association with stock subscription agreements         4.00pwvi_ExercisePricePerShareInAssociationWithStockSubscriptionAgreements
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= us-gaap_MaximumMember		              
Minimum [Member]                        
Exercise price per share in association with stock subscription agreements         2.00pwvi_ExercisePricePerShareInAssociationWithStockSubscriptionAgreements
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= us-gaap_MinimumMember