Operations and Basis of Presentation - Additional Information (Detail) $ in Millions	3 Months Ended
Sep. 30, 2016 USD ($) Country
Operations [Line Items]
Cash equivalents and marketable securities \| $	$ 22.5
Europe [Member] \| ILUVIEN [Member]
Operations [Line Items]
Number of other countries for which marketing approvals obtained for lead product \| Country	14

Cash and cash equivalents and marketable securities fair value.

No definition available.

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