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STOCKHOLDERS' EQUITY (Representative Warrants) (Details) - shares | 1 Months Ended |
--- | --- | ---
Aug. 31, 2017 | Dec. 31, 2019
Class of Stock [Line Items] |  |
Underlying shares (in shares) |  | 909,189
Representative Warrants [Member] | Minimum |  |
Class of Stock [Line Items] |  |
Class of warrant or right, term | 1 year |
Representative Warrants [Member] | Maximum |  |
Class of Stock [Line Items] |  |
Class of warrant or right, term | 5 years |

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- Definition Class of Warrant or Right, Term + References No definition available. + Details
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Namespace Prefix: | prpo_
Data Type: | xbrli:durationItemType
Balance Type: | na
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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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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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
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Namespace Prefix: |
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Balance Type: |
Period Type: |