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FAIR VALUE MEASUREMENTS - Additional information (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022
FAIR VALUE MEASUREMENTS |  |
Transfer of assets (liabilities) in and out of level 1 | $ 0 | $ 0
Transfer of assets (liabilities) in and out of level 2 | 0 | 0
Transfer of assets in and out of level 3 | 0 | 0
Transfer of liabilities in and out of level 3 | $ 0 | $ 0

X
- Definition Amount of transfers of assets measured on a recurring basis in and out of Level 1. + References No definition available. + Details
Name: | pmn_FairValueAssetsLiabilitiesLevel1TransfersAmount
Namespace Prefix: | pmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of transfers of liabilities measured on a recurring basis in and out of Level 1. + References No definition available. + Details
Name: | pmn_FairValueAssetsLiabilitiesLevel2TransfersAmount
Namespace Prefix: | pmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration