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STOCKHOLDERS' EQUITY (Convertible Promissory Note Warrants) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Equity [Abstract] |  |  |  |
Deemed dividend | $ 0 | $ 0 | $ 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