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Stock Options (Detail) - Stock Option Activity, Current Period (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Shares    
Balance at December 31, 2014 5,586,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Granted     
Expired/forfeited (500,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod  
Balance at March 31, 2015 5,086,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Options    
Shares    
Balance at December 31, 2014 2,750,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_StatementEquityComponentsAxis
= pwvi_OptionsMember
 
Granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_StatementEquityComponentsAxis
= pwvi_OptionsMember
 
Expired/forfeited 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
/ us-gaap_StatementEquityComponentsAxis
= pwvi_OptionsMember
 
Balance at March 31, 2015 2,750,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_StatementEquityComponentsAxis
= pwvi_OptionsMember
2,750,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_StatementEquityComponentsAxis
= pwvi_OptionsMember
Weighted Average Exercise Price    
Balance at December 31, 2014 $ 0.78pwvi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice1
/ us-gaap_StatementEquityComponentsAxis
= pwvi_OptionsMember
 
Granted $ 0us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= pwvi_OptionsMember
 
Expired/forfeited $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= pwvi_OptionsMember
 
Balance at March 31, 2015 $ 0.78pwvi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice1
/ us-gaap_StatementEquityComponentsAxis
= pwvi_OptionsMember
$ 0.78pwvi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice1
/ us-gaap_StatementEquityComponentsAxis
= pwvi_OptionsMember
Weighted Average Remaining Contractual Life (Years)    
Options outstanding 9 years 9 years
Aggregate Intrinsic Value    
Options outstanding $ 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_StatementEquityComponentsAxis
= pwvi_OptionsMember
$ 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_StatementEquityComponentsAxis
= pwvi_OptionsMember