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v3.22.2

ACCRUED EXPENSES OTHER CURRENT LIABILITIES (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Maximum [Member] |  |  |  |
Reduction in Certain Accrued Expense and Accounts Payable | $ 0 | $ 17,000 | $ 1,000 | $ 34,000

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- Definition Reduction in Certain Accrued Expense and Accounts Payable + References No definition available. + Details
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Namespace Prefix: | prpo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |