XML 16 R7.htm IDEA: XBRL DOCUMENT
v3.25.1

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($)
Statement of Cash Flows [Abstract] |
Offering cost | $ 0.2

X
- Definition Offering costs. + References No definition available. + Details
Name: | pstv_OfferingCosts
Namespace Prefix: | pstv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration