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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Estimated Useful Lives of Property and Equipment) (Details) | 12 Months Ended
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Dec. 31, 2017
Furniture and Fixtures [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 5 years
Furniture and Fixtures [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 7 years
Laboratory Equipment [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 3 years
Laboratory Equipment [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 9 years
Computer Equipment and Software [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 3 years
Computer Equipment and Software [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 7 years
Equipment Under Capital Leases [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 5 years
Equipment Under Capital Leases [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 10 years

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

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=prpo_LaboratoryEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=prpo_ComputerEquipmentAndSoftwareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_AssetsHeldUnderCapitalLeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |