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Operations and Basis of Presentation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012 Patient
Operations [Line Items]
Number of patients under trial	300
Cash equivalents and marketable securities	$ 15.7

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- Definition

Cash And Cash Equivalents And Marketable Securities Fair Value

+ References

No definition available.

+ Details

Name:	psdv_CashAndCashEquivalentsAndMarketableSecuritiesFairValue
Namespace Prefix:	psdv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Number Of Patient Under Trial

+ References

No definition available.

+ Details

Name:	psdv_NumberOfPatientUnderTrial
Namespace Prefix:	psdv_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	psdv_OperationsLineItems
Namespace Prefix:	psdv_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration