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v3.20.1

SUBSEQUENT EVENTS (Details) - Subsequent Events - USD ($) |  | 1 Months Ended |
--- | --- | --- | ---
Mar. 26, 2020 | Mar. 26, 2020 | Mar. 25, 2020
Bridge Notes [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Guaranteed interest period | 18 months |  |
Floor price |  |  | $ 2.25
May 2019 Warrants |  |  |
Subsequent Event [Line Items] |  |  |
Floor price | $ 0.40 | $ 0.40 |
LP 2020 Purchase Agreement [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Maximum repurchase of common stock amount | $ 10,000,000 | $ 10,000,000 |
Purchase agreement term |  | 24 months |
LP 2020 Purchase Agreement [Member] | Lincoln Park [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Stock issued for commitment fees |  | 250,000 |
Maximum repurchase of common stock | 50,000 | 50,000 |
Maximum amount of single regular purchase |  | $ 1,000,000 |
LP 2020 Purchase Agreement [Member] | Lincoln Park [Member] | Closing Sale Price Above 1.00 [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Maximum repurchase of common stock | 80,000 | 80,000 |
LP 2020 Purchase Agreement [Member] | Lincoln Park [Member] | Closing Sale Price Above 1.50 [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Maximum repurchase of common stock | 100,000 | 100,000 |

X
- Definition The minimum price per share of the conversion feature embedded in the debt instrument. + References No definition available. + Details
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Namespace Prefix: | prpo_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The guaranteed interest term, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The amount amount for single repurchase program. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The number shares issued for commitment fees. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Details
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- Details
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Namespace Prefix: |
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Period Type: |

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

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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- Details
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- Details
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