XML 51 R40.htm IDEA: XBRL DOCUMENT
v3.21.1

ACCRUED EXPENSES OTHER CURRENT LIABILITIES (Narrative) (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Reduction in Certain Accrued Expense and Accounts Payable |  | $ 0
Maximum |  |
Reduction in Certain Accrued Expense and Accounts Payable | $ 100,000 |

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

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