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Stockholders' Equity-Fair value of each warrant granted for equity and debt raises (Details)	12 Months Ended
	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

X

- 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