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Stockholders' Equity-Fair value of each warrant granted for equity and debt raises (Details) | 12 Months Ended
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Dec. 31, 2014
Stockholders Equity-fair Value Of Each Warrant Granted For Equity And Debt Raises Details |
Risk free interest rate minimum | 1.10%pwvi_RiskFreeInterestRateMinimum
Risk free interest rate maximum | 1.38%pwvi_RiskFreeInterestRateMaximum
Expected term minimum in years | 3pwvi_ExpectedTermMinimum
Expected term maximum in years | 4pwvi_ExpectedTermMaximum
Annualized volatility | 90.00%pwvi_AnnualizedVolatility
Expected dividends | 0.00%pwvi_ExpectedDividends

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- Definition Custom Element. + References No definition available. + Details
Name: | pwvi_AnnualizedVolatility
Namespace Prefix: | pwvi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | pwvi_Disclosure8.StockholdersEquityfairValueOfEachWarrantGrantedForEquityAndDebtRaisesDetailsAbstract
Namespace Prefix: | pwvi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price). + References No definition available. + Details
Name: | pwvi_ExpectedDividends
Namespace Prefix: | pwvi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. + References No definition available. + Details
Name: | pwvi_ExpectedTermMaximum
Namespace Prefix: | pwvi_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. + References No definition available. + Details
Name: | pwvi_ExpectedTermMinimum
Namespace Prefix: | pwvi_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
Name: | pwvi_RiskFreeInterestRateMaximum
Namespace Prefix: | pwvi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
Name: | pwvi_RiskFreeInterestRateMinimum
Namespace Prefix: | pwvi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration