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Stockholders' Equity (Private Placement of Common Stock) (Details) (USD $) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Feb. 28, 2012 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012
Private Placement of Common Stock |  |  |  |  |  |  |  |  |  |
Company raised exclusively from accredited European investors pursuant to a private placement | $ 500,000pwvi_CompanyRaisedExclusivelyFromAccreditedEuropeanInvestorsPursuantToAPrivatePlacement |  |  |  |  |  |  |  |  |
Shares of common stock issued to European investors pursuant to a private placement | 500,000pwvi_SharesOfCommonStockIssuedToEuropeanInvestorsPursuantToAPrivatePlacement |  |  |  |  |  |  |  |  |
Price per share of common stock issued to European investors pursuant to a private placement | $ 1.00pwvi_PricePerShareOfCommonStockIssuedToEuropeanInvestorsPursuantToAPrivatePlacement |  |  |  |  |  |  |  |  |
Fund raised from a Newton affiliate | 275,000pwvi_FundRaisedFromANewtonAffiliate |  |  |  |  |  |  |  |  |
Newton affiliates received three-year warrants to purchase shares in connections with the settlement of certain claims by and between the Company and Newton | 500,000pwvi_NewtonAffiliatesReceivedThreeYearWarrantsToPurchaseSharesInConnectionsWithTheSettlementOfCertainClaimsByAndBetweenTheCompanyAndNewton |  |  |  |  |  |  |  |  |
Company raised gross proceeds through the private placement of unregistered shares of common stock to accredited investors |  | $ 100,000pwvi_CompanyRaisedGrossProceedsThroughThePrivatePlacementOfUnregisteredSharesOfCommonStockToAccreditedInvestors | $ 75,000pwvi_CompanyRaisedGrossProceedsThroughThePrivatePlacementOfUnregisteredSharesOfCommonStockToAccreditedInvestors | $ 240,000pwvi_CompanyRaisedGrossProceedsThroughThePrivatePlacementOfUnregisteredSharesOfCommonStockToAccreditedInvestors | $ 25,000pwvi_CompanyRaisedGrossProceedsThroughThePrivatePlacementOfUnregisteredSharesOfCommonStockToAccreditedInvestors | $ 150,000pwvi_CompanyRaisedGrossProceedsThroughThePrivatePlacementOfUnregisteredSharesOfCommonStockToAccreditedInvestors | $ 125,000pwvi_CompanyRaisedGrossProceedsThroughThePrivatePlacementOfUnregisteredSharesOfCommonStockToAccreditedInvestors | $ 492,030pwvi_CompanyRaisedGrossProceedsThroughThePrivatePlacementOfUnregisteredSharesOfCommonStockToAccreditedInvestors | $ 71,000pwvi_CompanyRaisedGrossProceedsThroughThePrivatePlacementOfUnregisteredSharesOfCommonStockToAccreditedInvestors | $ 335,000pwvi_CompanyRaisedGrossProceedsThroughThePrivatePlacementOfUnregisteredSharesOfCommonStockToAccreditedInvestors
Issue of unregistered shares of common stock to accredited investors |  | 1,000,000pwvi_IssueOfUnregisteredSharesOfCommonStockToAccreditedInvestors | 750,000pwvi_IssueOfUnregisteredSharesOfCommonStockToAccreditedInvestors | 2,400,000pwvi_IssueOfUnregisteredSharesOfCommonStockToAccreditedInvestors | 100,000pwvi_IssueOfUnregisteredSharesOfCommonStockToAccreditedInvestors | 600,000pwvi_IssueOfUnregisteredSharesOfCommonStockToAccreditedInvestors | 500,000pwvi_IssueOfUnregisteredSharesOfCommonStockToAccreditedInvestors |  | 71,000pwvi_IssueOfUnregisteredSharesOfCommonStockToAccreditedInvestors | 335,000pwvi_IssueOfUnregisteredSharesOfCommonStockToAccreditedInvestors
Price per share of common stock issuedto accredited investors |  | $ 0.10pwvi_PricePerShareOfCommonStockIssuedtoAccreditedInvestors | $ 0.10pwvi_PricePerShareOfCommonStockIssuedtoAccreditedInvestors | $ 0.10pwvi_PricePerShareOfCommonStockIssuedtoAccreditedInvestors | $ 0.25pwvi_PricePerShareOfCommonStockIssuedtoAccreditedInvestors | $ 0.25pwvi_PricePerShareOfCommonStockIssuedtoAccreditedInvestors | $ 0.25pwvi_PricePerShareOfCommonStockIssuedtoAccreditedInvestors |  | $ 1.00pwvi_PricePerShareOfCommonStockIssuedtoAccreditedInvestors | $ 1.00pwvi_PricePerShareOfCommonStockIssuedtoAccreditedInvestors
Each investor received a three-year warrant to purchase shares of common stock at a price per share |  |  |  |  |  |  |  | $ 1.00pwvi_EachInvestorReceivedAThreeYearWarrantToPurchaseSharesOfCommonStockAtAPricePerShare | $ 3.00pwvi_EachInvestorReceivedAThreeYearWarrantToPurchaseSharesOfCommonStockAtAPricePerShare | $ 3.00pwvi_EachInvestorReceivedAThreeYearWarrantToPurchaseSharesOfCommonStockAtAPricePerShare
Issue of unregistered shares of common stock to accredited investors at $ 0.43 per share |  |  |  |  |  |  |  | 396,000pwvi_IssueOfUnregisteredSharesOfCommonStockToAccreditedInvestorsAt043PerShare |  |
Issue of unregistered shares of common stock to accredited investors .715 per share |  |  |  |  |  |  |  | 450,000pwvi_IssueOfUnregisteredSharesOfCommonStockToAccreditedInvestors715PerShare |  |
Percentage of commission on the gross proceeds of offering paid to its placement agent. |  |  | 10.00%pwvi_PercentageOfCommissionOnTheGrossProceedsOfOfferingPaidToItsPlacementAgent |  |  |  |  | 10.00%pwvi_PercentageOfCommissionOnTheGrossProceedsOfOfferingPaidToItsPlacementAgent | 10.00%pwvi_PercentageOfCommissionOnTheGrossProceedsOfOfferingPaidToItsPlacementAgent | 10.00%pwvi_PercentageOfCommissionOnTheGrossProceedsOfOfferingPaidToItsPlacementAgent

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