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STOCKHOLDERS' EQUITY (Deemed Dividends) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Equity [Abstract]
Amount Recorded	$ 0	$ 0

X

- Definition

Deemed Dividend

+ References

No definition available.

+ Details

Name:	prpo_DeemedDividend
Namespace Prefix:	prpo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_EquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration