COLLABORATION AGREEMENTS (Details)	1 Months Ended
Jul. 31, 2020 agreement
COLLABORATION AGREEMENTS
Number of collaborative agreements	2

Represents the number of collaborative agreements.

No definition available.

Name:	pmn_NumberOfCollaborativeAgreements
Namespace Prefix:	pmn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration