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STOCKHOLDERS' EQUITY (Common Stock Warrants) (Details)	6 Months Ended
	Jun. 30, 2018 shares
STOCKHOLDERS' EQUITY [Abstract]
Warrants expired in period	23,055

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- Definition

Warrants expired in period

+ References

No definition available.

+ Details

Name:	prpo_WarrantsExpiredInPeriod
Namespace Prefix:	prpo_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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