Deemed Dividend

No definition available.

Name:	prpo_DeemedDividend
Namespace Prefix:	prpo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

Name:	us-gaap_ClassOfStockLineItems
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

The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

+ Details

Name:	us-gaap_DebtConversionConvertedInstrumentAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

+ Details

Name:	us-gaap_DebtConversionConvertedInstrumentSharesIssued1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=prpo_InducementAgreement2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	prpo_DeemedDividendsAxis=prpo_DeemedDividendGMember
Namespace Prefix:
Data Type:	na
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:

- Details

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

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_BridgeLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

STOCKHOLDERS' EQUITY (Note Conversion Warrants) (Details) - USD ($)		1 Months Ended	3 Months Ended
	Feb. 12, 2019	Jul. 31, 2017	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Aug. 31, 2017
Class of Stock [Line Items]
Conversion of debt into stock	$ 1,900,000			$ 200,000
Conversion of convertible notes into common stock (in shares)	120,983			93,333
2018 Inducement Agreement
Class of Stock [Line Items]
Deemed dividend					$ 3,514,000
2018 Inducement Agreement \| Deemed Dividend G
Class of Stock [Line Items]
Deemed dividend					5,000
2018 Purchase Agreement \| Deemed Dividend J
Class of Stock [Line Items]
Deemed dividend					58,000
2018 Purchase Agreement \| Deemed Dividend F
Class of Stock [Line Items]
Deemed dividend					$ 8,000
Bridge Loan \| 2018 Inducement Agreement \| Deemed Dividend G
Class of Stock [Line Items]
Deemed dividend			$ 5,000
Bridge Loan \| 2018 Purchase Agreement \| Deemed Dividend F
Class of Stock [Line Items]
Deemed dividend			$ 8,000
Bridge Loan \| Common Stock
Class of Stock [Line Items]
Conversion of convertible notes into common stock (in shares)		23,999
Exercise price (in dollars per share)			$ 21.00			$ 45.00
Bridge Loan \| Common Stock \| 2018 Inducement Agreement
Class of Stock [Line Items]
Exercise price (in dollars per share)			11.25
Bridge Loan \| Common Stock \| 2018 Purchase Agreement
Class of Stock [Line Items]
Exercise price (in dollars per share)			$ 15.60