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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