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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 / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per share in association with stock subscription agreements |  |  |  |  | 2.00pwvi_ExercisePricePerShareInAssociationWithStockSubscriptionAgreements / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |

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- Definition Company issued its Chief Executive Officer five year warrants to purchase common stock + References No definition available. + Details
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- Definition Custom Element. + References No definition available. + Details
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