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Intangible Assets (Schedule of Fair Value of Combined Intangible Assets) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2011	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Intangible Assets [Line Items]
Pre-impairment Carrying Value at December 31, 2011	$ 19,426	$ 19,426		$ 19,426
Impairment Charge	14,800	(14,830)	14,830	14,800
Post-impairment Carrying Value at December 31, 2011	4,596	4,596	4,226	4,596	21,564
Durasert
Intangible Assets [Line Items]
Pre-impairment Carrying Value at December 31, 2011	6,318	6,318		6,318
Impairment Charge		(3,141)
Post-impairment Carrying Value at December 31, 2011	3,177	3,177		3,177
BioSilicon
Intangible Assets [Line Items]
Pre-impairment Carrying Value at December 31, 2011	13,108	13,108		13,108
Impairment Charge		(11,689)
Post-impairment Carrying Value at December 31, 2011	$ 1,419	$ 1,419		$ 1,419

X

- Definition

Finite Lived Intangible Assets Net Before Impairment

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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X

- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16373-109275



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 46

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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