Nature of Operations (Details)	Jun. 30, 2021 ClinicalTrial
Nature of Operations [Abstract]
Number of planned clinical trials delayed	2
Number of planned clinical trials	3

The number of planned clinical trials that have been delayed, specifically as a result of the adverse impact the COVID-19 Pandemic has had on clinical trial operations for cancer indications in the United States.

No definition available.

Name:	pdsb_NumberOfPlannedClinicalTrialsDelayed
Namespace Prefix:	pdsb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant