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Operations and Basis of Presentation - Additional Information (Detail) $ in Millions	3 Months Ended
	Sep. 30, 2015 USD ($) Country
Operations [Line Items]
Cash equivalents and marketable securities	$ 24.0
Europe [Member] | ILUVIEN [Member]
Operations [Line Items]
Number of countries approved for lead product | Country	17

X

- Definition

Cash and cash equivalents and marketable securities fair value.

+ References

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+ Details

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X

- Definition

Number of countries approved for product.

+ References

No definition available.

+ Details

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

X

- Definition

Operations [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	psdv_
Data Type:	xbrli:stringItemType
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X

- Details

Name:	us-gaap_StatementGeographicalAxis=us-gaap_EuropeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: