Deemed Dividend

No definition available.

Name:	prpo_DeemedDividend
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Shares Outstanding Ownership Threshold After Exercised Warrants, Percentage

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Shares Outstanding Ownership Threshold Prior to Exercised Warrants, Percentage

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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Period Type:	instant

- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	prpo_WarrantsAndRightsOutstandingTerm
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Period Type:	duration

- Definition

Warrants exercised

+ References

No definition available.

+ Details

Name:	prpo_WarrantsExercised
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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- 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

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- 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://www.xbrl.org/2003/role/presentationRef
-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

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=prpo_PurchaseAgreement2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	prpo_DeemedDividendsAxis=prpo_DeemedDividendJMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

STOCKHOLDERS' EQUITY (Series C Warrants) (Details) - USD ($)	1 Months Ended	3 Months Ended
	Feb. 28, 2018	Mar. 31, 2019	Mar. 31, 2018	Nov. 30, 2017
Class of Stock [Line Items]
Underlying shares (in shares)		917,563
Warrants exercised		20,000
Series C Warrants [Member]
Class of Stock [Line Items]
Underlying shares (in shares)				130,857
Exercise price (in dollars per share)				$ 24.45
Warrants and Rights Outstanding, Term		5 years
Percentage of outstanding shares owned threshold prior to exercise of warrants				4.99%
Percentage of outstanding shares owned threshold after exercise of warrants				9.99%
2018 Inducement Agreement
Class of Stock [Line Items]
Deemed dividend			$ 3,514,000
2018 Purchase Agreement \| Deemed Dividend J
Class of Stock [Line Items]
Deemed dividend			$ 58,000
2018 Purchase Agreement \| Series C Warrants [Member]
Class of Stock [Line Items]
Exercise price (in dollars per share)	$ 15.60	$ 11.25
2018 Purchase Agreement \| Series C Warrants [Member] \| Deemed Dividend J
Class of Stock [Line Items]
Deemed dividend	$ 58,000