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

X
- 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

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