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STOCKHOLDERS' EQUITY (Deemed Dividends) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Class of Stock [Line Items] |  |
Amount Recorded | $ 0 |
2018 Purchase Agreement | Deemed Dividend A |  |
Class of Stock [Line Items] |  |
Amount Recorded |  | $ 3,333
2018 Purchase Agreement | Deemed Dividend B |  |
Class of Stock [Line Items] |  |
Amount Recorded |  | 6
2018 Purchase Agreement | Deemed Dividend D |  |
Class of Stock [Line Items] |  |
Amount Recorded |  | 5
2018 Inducement Agreement |  |
Class of Stock [Line Items] |  |
Amount Recorded |  | $ 3,344

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- Definition Deemed Dividend + References No definition available. + Details
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Namespace Prefix: | prpo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | prpo_DeemedDividendsAxis=prpo_DeemedDividendBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |