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Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Income Statement [Abstract] |  |  |
Non-recurring fee income received | $ 0.1 | $ 0.1 | $ 0.6

X
- Definition Non-recurring fee income received. + References No definition available. + Details
Name: | ptmn_NonRecurringFeeIncomeReceived
Namespace Prefix: | ptmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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