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Commitments and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended
	Mar. 31, 2014
Operating Leased Assets [Line Items]
Irrevocable standby letter of credit	$ 150,000
Watertown [Member]
Operating Leased Assets [Line Items]
Lease renewal, Period	5 years
Initial lease term extended period	2019-04

X

- Definition

Operating Lease Initial Lease Term Expiration Date

+ References

No definition available.

+ Details

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Namespace Prefix:	psdv_
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Balance Type:	na
Period Type:	duration

X

- Definition

Term of the lessee's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.8,17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Period Type:	instant