XML 66 R51.htm IDEA: XBRL DOCUMENT
v3.20.1

CONVERTIBLE NOTES - Bridge Notes (Details) |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 14, 2019 USD ($) D $ / shares shares | Apr. 16, 2019 USD ($) D $ / shares shares | Nov. 29, 2018 USD ($) D $ / shares | Sep. 17, 2018 USD ($) $ / shares | Sep. 17, 2018 USD ($) D $ / shares | Sep. 17, 2018 USD ($) $ / shares | Sep. 17, 2018 USD ($) $ / shares | Apr. 30, 2018 USD ($) $ / shares | Apr. 20, 2018 USD ($) | Feb. 12, 2018 USD ($) shares | Sep. 30, 2018 USD ($) item $ / shares | Apr. 30, 2018 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) item $ / shares shares | Sep. 30, 2018 USD ($) item $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Apr. 30, 2019 $ / shares | Nov. 30, 2018 $ / shares | Sep. 20, 2018 $ / shares | Sep. 19, 2018 $ / shares | Aug. 31, 2018 USD ($) $ / shares | Jul. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Oct. 03, 2017 $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,150,000 | $ 3,850,000 |  |  |  |  |  |  |  |
Number of additional drawdowns completed | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 516,000 |  | 519,000 | 516,000 |  |  |  |  |  |  |  |
Warrant revaluation |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (416,000) | (1,918,000) |  |  |  |  |  |  |  |
Payments of financial advisor fees |  |  |  |  |  |  |  |  |  |  |  | $ 116,000 |  |  |  |  |  |  |  |  |  |  |  |
Loss on modification of warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,128,000) |  |  |  |  |  |  |  |  |
Proceeds from convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,150,000 | 3,850,000 |  |  |  |  |  |  |  |
Derivative asset (liability) |  |  |  |  |  |  |  |  |  |  |  |  | 62,000 |  |  | 62,000 |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,903,000) |  |  |  |  |  |  |  |
Warrant liability canceled due to settlement of equity instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 456,000 |  |  |  |  |  |  |  |
Number of shares converted from debt instrument (in shares) | shares |  |  |  |  |  |  |  |  |  | 120,983 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible debt plus interest into common stock |  |  |  |  |  |  |  |  |  | $ 1,900,000 |  |  |  |  | $ 7,553,000 | 2,356,000 |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 909,189 |  |  |  |  |  |  |  |  |
Wrote-off of debt discount with an offset to additional paid in capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 731,000 | 210,000 |  |  |  |  |  |  |  |
Write-off debt derivative liability in conjunction with convertible note conversions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 477,000 | 301,000 |  |  |  |  |  |  |  |
Long-term debt, net of current maturities |  |  |  |  |  |  |  |  |  |  |  |  | 253,000 |  | 198,000 | 253,000 |  |  |  |  |  |  |  |
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (415,000) | 267,000 |  |  |  |  |  |  |  |
Bridge Notes Beneficial Conversion Features |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset (liability) |  |  |  |  |  |  |  |  |  |  |  |  | 15,000 |  |  | 15,000 |  |  |  |  |  |  |  |
Bridge Notes Redemption Feature [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset (liability) |  |  |  |  |  |  |  |  |  |  |  |  | 30,000 |  |  | 30,000 |  |  |  |  |  |  |  |
Convertible Promissory Note Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21.00 |  |  |  |  |  |  |  |  | $ 45.00
April 2018 Warrants, First Half |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Term |  |  |  |  |  |  |  | 5 years |  |  |  | 5 years |  | 5 years |  |  |  |  |  |  |  |  |  |
April 2018 Warrants, Second Half |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Term |  |  |  |  |  |  |  | 1 year |  |  |  | 1 year |  | 1 year |  |  |  |  |  |  |  |  |  |
April 2018 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share | $ / shares |  |  |  |  |  |  |  | $ 11.25 |  |  |  | $ 11.25 |  |  |  |  |  |  | $ 7.50 | $ 11.25 |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock rights issued (in shares) | shares | shares |  |  |  |  |  |  |  |  |  |  |  | 243,224 |  |  |  |  |  |  |  |  |  |  |  |
Warrants, fair value |  |  |  |  |  |  |  | $ 1,100,000 |  |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  |  |  |  |  |  |  | 150 |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 11.25 |  |  | $ 7.50 | $ 11.25 |  | $ 7.50 |  |  |  |  |  |  |  |  |  |
Warrant revaluation |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |
Advisor fees as a percentage of proceeds |  |  |  |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from convertible notes |  |  |  |  |  |  |  |  |  |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Amended Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.40 |  |  |  |  |  |  |
Warrants term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Advisor Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Term |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |
Stock rights issued (in shares) | shares | shares |  |  |  |  |  |  |  |  |  |  |  | 15,466 |  |  |  |  |  |  |  |  |  |  |  |
Warrants, fair value |  |  |  |  |  |  |  | $ 100,000 |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Convertible Promissory Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 300,000 | $ 300,000 | $ 300,000 | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt, threshold consecutive trading days | D |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share | $ / shares |  |  |  | $ 15.00 | $ 15.00 | $ 15.00 | $ 15.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, threshold trading days | item |  |  |  |  | 5 |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  | 1.65 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liability from debt discount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |
Conversion of convertible debt plus interest into common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,800,000 |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  | 18 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal outstanding |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Convertible Promissory Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 500,000 | $ 500,000 | $ 500,000 | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarter 3 2018 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock rights issued (in shares) | shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 196,340 |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.40 |  |  |  |  |  |  |
Warrants term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Quarter 4 2018 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |
Stock rights issued (in shares) | shares | shares |  |  |  |  |  |  |  |  |  |  |  |  | 300,115 |  |  |  |  |  |  |  |  |  |  |
Proceeds from convertible notes |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |
2018 Note Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  | $ 3,296,703 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 4.50 |  |  |  | $ 4.50 |  |  |  |  |  | $ 2.25 |  |  |  |  |  |
2018 Note Agreement | April 2018 Warrants, First Half |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |
2018 Note Agreement | April 2018 Warrants, Second Half |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
2018 Note Agreement | Advisor Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share | $ / shares |  |  |  |  |  |  |  | $ 11.25 |  |  |  | $ 11.25 |  |  |  |  |  |  |  |  |  |  |  |
Stock rights issued (in shares) | shares | shares |  |  |  |  |  |  |  |  |  |  |  | 15,466 |  |  |  |  |  |  |  |  |  |  |  |
Warrants, fair value |  |  |  |  |  |  |  | $ 100,000 |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 11.25 |  |  |  | $ 11.25 |  |  |  |  |  |  |  |  |  |  |  |
Convertible Bridge Loan | Quarter 4 2018 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants, fair value |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000 |  |  | $ 700,000 |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.40 |  |  | $ 5.40 |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares |  |  |  |  |  |  |  |  |  |  |  |  | 300,115 |  |  | 300,115 |  |  |  |  |  |  |  |
Warrants term |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  | 5 years |  |  |  |  |  |  |  |
Quarter 3 2018 Bridge Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000 |  |  |  |  |  |  |  |  |  |
Derivative liability from debt discount |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  | 100,000 |  |  |  |  |  |  |  |  |  |
Proceeds from convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000 |  |  |  |  |  |  |  |  |  |
Quarter 3 2018 Bridge Notes | Quarter 3 2018 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 700,000 |  |  |  |  |  |  |  |  |  |
Proceeds from convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  | 700,000 |  |  |  |  |  |  |  |  |  |
April 2018 Bridge Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  |  |  | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of additional drawdowns completed | item |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liability from debt discount |  |  |  |  |  |  |  | $ 100,000 |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from convertible notes |  |  |  |  |  |  |  |  |  |  |  | 600,000 |  |  |  |  |  |  |  |  |  |  |  |
April 2018 Bridge Notes | Convertible Promissory Note Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount percentage |  |  |  |  |  |  |  |  | 9.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
May 2019 Bridge Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock rights issued (in shares) | shares | shares | 154,343 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants, fair value | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares | $ 9.56 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants term | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarter 4 2018 Bridge Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |  |
Number of additional drawdowns completed | item |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000 |  |  | $ 1,400,000 |  |  |  |  |  |  |  |
Debt discount and debt issuance costs as a reduction of the related debt |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |  | 1,100,000 |  |  |  |  |  |  |  |
Beneficial conversion feature |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  |  |  |  |
Loss on issuance of convertible notes |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from convertible notes |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |
Write off of debt premium with an offset to additional paid in capital |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |
Quarter 4 2018 Bridge Notes | Amendment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,100,000 |  | $ 300,000 |  |  |  |  |  |  |  |  |
Number of additional drawdowns completed | item |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000 |  |  | 1,200,000 |  |  |  |  |  |  |  |
Debt discount |  |  |  |  |  |  |  |  |  |  |  |  | 108,000 |  |  | 108,000 |  |  |  |  |  |  |  |
Proceeds from convertible notes |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  | 300,000 |  |  |  |  |  |  |  |  |
Quarter 4 2018 Bridge Notes | Amendment Agreement | Other current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  |  |
Proceeds from convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  |  |
Convertible Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  |  |  | 4,377,000 |  | 142,000 | 4,377,000 |  |  |  |  |  |  |  |
Long-term debt, net of current maturities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | Quarter 3 2018 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discount and debt issuance costs as a reduction of the related debt |  |  |  |  |  |  |  |  |  |  | $ 1,300,000 |  |  | 1,300,000 |  |  |  |  |  |  |  |  |  |
Warrants, fair value |  |  |  |  |  |  |  |  |  |  | $ 700,000 |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.25 |  |  |
Warrant revaluation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |
Convertible Debt [Member] | Quarter 4 2018 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants, fair value |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000 |  |  | $ 700,000 |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.40 |  |  | $ 5.40 |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares |  |  |  |  |  |  |  |  |  |  |  |  | 300,115 |  |  | 300,115 |  |  |  |  |  |  |  |
Warrants term |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  | 5 years |  |  |  |  |  |  |  |
Convertible Debt [Member] | Convertible Bridge Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,800,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  | 8.00% |  |  |  |  |  |  |  |  |  |
Discount percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% |  |  |  |  |  |  |  |  |  |
Conversion threshold percentage of stock price trigger |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |
Convertible debt, threshold consecutive trading days | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |
Conversion price per share | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 7.50 |  |  | $ 7.50 |  |  |  |  |  |  |  |  |  |
Repayment Period |  |  |  |  |  |  |  |  |  |  |  |  |  | 180 days |  |  |  |  |  |  |  |  |  |
Debt discount and debt issuance costs as a reduction of the related debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,800,000 |  |  |  |  |  |  |  |  |
Early repayment trigger, amount of gross proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Period To File Registration Statement |  |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage per month charged as damages if registration statement not filed by deadline |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
Debt discount |  |  |  |  |  |  |  |  |  |  | $ 164,000 |  | $ 1,111,000 | $ 164,000 | 1,796,000 | $ 1,111,000 |  |  |  |  |  |  |  |
Debt issuance costs, net |  |  |  |  |  |  |  |  |  |  | $ 164,000 |  |  | $ 164,000 |  |  |  |  |  |  |  |  |  |
Beneficial conversion feature |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  |  |
Net debt issuance costs and debt discounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,700,000 |  |  |  |  |  |  |  |  |
Loss on issuance of convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900,000 |  |  |  |  |  |  |  |  |
Debt premium on debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 647,000 |  |  | $ 647,000 |  |  |  |  |  |  |  |
Warrant liability canceled due to settlement of equity instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,400,000 |  |  |  |  |  |  |  |  |
Number of shares converted from debt instrument (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,766 | 93,334 |  |  |  |  |  |  |  |
Conversion of convertible debt plus interest into common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 |  |  |  |  |  |  |  |
Amortization of debt discount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 273,000 | 118,000 |  |  |  |  |  |  |  |
Amortization of debt premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 167,000 | 170,000 |  |  |  |  |  |  |  |
Convertible Debt [Member] | Convertible Bridge Loan | Amendment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion threshold percentage of stock price trigger |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt, threshold consecutive trading days | D |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discount |  |  | $ 3,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial conversion feature |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing amount |  |  | $ 1,318,681 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price above the closing bid price of common stock | $ / shares |  |  | $ 0.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floor price | $ / shares |  |  | $ 2.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, carrying amount |  |  | $ 3,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of convertible debt |  |  | 4,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt premium on debt |  |  | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | 2,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of debt premium with an offset to additional paid in capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |
Convertible Debt [Member] | Convertible Bridge Loan | Amendment Agreement | Bridge Notes Beneficial Conversion Features |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial conversion feature |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | Convertible Bridge Loan | Amendment Agreement | Bridge Notes Redemption Feature [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset (liability) |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | Convertible Bridge Loan | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 105.00% |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | Convertible Bridge Loan | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 110.00% |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | Convertible Bridge Loan | Debt Instrument, Redemption, Period Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 115.00% |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | Convertible Bridge Loan | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 4.50 |  |  | $ 4.50 |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | Convertible Bridge Loan | Maximum | Amendment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share | $ / shares |  |  | $ 3.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liability from debt discount |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | Quarter 3 2018 Bridge Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discount and debt issuance costs as a reduction of the related debt |  |  |  |  |  |  |  |  |  |  | $ 1,300,000 |  |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |
Debt discount |  |  |  |  |  |  |  |  |  |  | 133,000 |  |  | 133,000 |  |  |  |  |  |  |  |  |  |
Beneficial conversion feature |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |
Derivative liability from debt discount |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  | 100,000 |  |  |  |  |  |  |  |  |  |
Net debt issuance costs and debt discounts |  |  |  |  |  |  |  |  |  |  | 1,400,000 |  |  | 1,400,000 |  |  |  |  |  |  |  |  |  |
Loss on issuance of convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | July 2018 Bridge Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 348,104 |  |
Total debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 382,526 |  |
Convertible Debt [Member] | August 2018 Bridge Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 495,955 |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 545,005 |  |  |
Convertible Debt [Member] | September 2018 Bridge Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | 495,941 |  |  | 495,941 |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  | 544,990 |  |  | 544,990 |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | April 2018 Bridge Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  | $ 1,660,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  | 1,824,176 |  | 1,500,000 |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |
Debt discount and debt issuance costs as a reduction of the related debt |  |  |  |  |  |  |  |  |  |  | $ 1,300,000 |  |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |
Beneficial conversion feature |  |  |  |  |  |  |  |  |  |  |  | $ 1,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from convertible notes |  |  |  |  |  |  |  |  | $ 1,660,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | April 2019 Bridge Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount percentage |  | 9.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment Period |  | 180 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discount and debt issuance costs as a reduction of the related debt |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discount |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock rights issued (in shares) | shares | shares |  | 147,472 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants, fair value |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares |  | $ 5.40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial conversion feature |  | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net debt issuance costs and debt discounts |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on issuance of convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |
Proceeds from convertible notes |  | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants term |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | April 2019 Bridge Notes | Amendment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion threshold percentage of stock price trigger |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt, threshold consecutive trading days | D |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share | $ / shares |  | $ 0.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floor price | $ / shares |  | 2.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | April 2019 Bridge Notes | Maximum | Amendment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share | $ / shares |  | $ 3.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | May 2019 Bridge Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion threshold percentage of stock price trigger | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt, threshold consecutive trading days | D | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share | $ / shares | $ 7.12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment Period | 180 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discount and debt issuance costs as a reduction of the related debt | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discount | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial conversion feature | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net debt issuance costs and debt discounts | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on issuance of convertible notes | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Original issue discount (as a percent) | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from convertible notes | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floor price | $ / shares | $ 2.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Amount of increase (decrease) in additional paid in capital (APIC) resulting from write-off debt derivative liability in conjunction with convertible note conversions. + References No definition available. + Details
Name: | prpo_AdjustmentsToAdditionalPaidInCapitalWriteOffDebtDerivativeLiability
Namespace Prefix: | prpo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase (decrease) in additional paid in capital (APIC) resulting from write-off debt discounts (net of debt premiums) in conjunction with convertible note conversions. + References No definition available. + Details
Name: | prpo_AdjustmentsToAdditionalPaidInCapitalWriteOffDebtDiscountsPremium
Namespace Prefix: | prpo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase (decrease) in additional paid in capital (APIC) resulting from write-off debt premiums in conjunction with convertible note conversions. + References No definition available. + Details
Name: | prpo_AdjustmentsToAdditionalPaidInCapitalWriteOffDebtPremium
Namespace Prefix: | prpo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Advisor fees as a percentage of proceeds + References No definition available. + Details
Name: | prpo_AdvisorFeesAsPercentageOfProceeds
Namespace Prefix: | prpo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of noncash expense included in interest expense to amortize debt discount associated with the related debt instruments. + References No definition available. + Details
Name: | prpo_AmortizationOfDebtDiscount
Namespace Prefix: | prpo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of noncash expense included in interest expense to amortize debt premium associated with the related debt instruments. + References No definition available. + Details
Name: | prpo_AmortizationOfDebtPremium
Namespace Prefix: | prpo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Class of Warrant or Right, Number of Issued Warrants or Rights + References No definition available. + Details
Name: | prpo_ClassOfWarrantOrRightNumberOfIssuedWarrantsOrRights
Namespace Prefix: | prpo_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Class of Warrant or Right, Term + References No definition available. + Details
Name: | prpo_ClassOfWarrantOrRightTerm
Namespace Prefix: | prpo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The duration of repayment of notes from the date of issuance to achieve the conversion price. + References No definition available. + Details
Name: | prpo_DebtInstrumentConversionPriceAchievementRepaymentPeriodFromDateOfIssuance
Namespace Prefix: | prpo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Definition Original issue discount rate for funds borrowed, under the debt agreement. + References No definition available. + Details
Name: | prpo_DebtInstrumentDiscountPercentage
Namespace Prefix: | prpo_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period to file registration statement. + References No definition available. + Details
Name: | prpo_DebtInstrumentPeriodToFileRegistrationStatement
Namespace Prefix: | prpo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Discount percentage + References No definition available. + Details
Name: | prpo_DiscountPercentage
Namespace Prefix: | prpo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Early Repayment Trigger Amount of Gross Proceeds + References No definition available. + Details
Name: | prpo_EarlyRepaymentTriggerAmountOfGrossProceeds
Namespace Prefix: | prpo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Difference between the fair value of payments made and the carrying amount of convertible notes which is extinguished prior to maturity. + References No definition available. + Details
Name: | prpo_GainLossOnExtinguishmentOfConvertibleNotes
Namespace Prefix: | prpo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The gain (loss) on modification of warrants. + References No definition available. + Details
Name: | prpo_GainLossOnModificationOfWarrants
Namespace Prefix: | prpo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of additional drawdowns. + References No definition available. + Details
Name: | prpo_NumberOfAdditionalDrawdowns
Namespace Prefix: | prpo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of Principal Outstanding + References No definition available. + Details
Name: | prpo_PercentageOfPrincipalOutstanding
Namespace Prefix: | prpo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage per month charged as damages if registration statement not filed by deadline + References No definition available. + Details
Name: | prpo_PercentagePerMonthChargedAsDamagesIfRegistrationStatementNotFiledByDeadline
Namespace Prefix: | prpo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of reduction of debt discount and debt issuance cost from debt. + References No definition available. + Details
Name: | prpo_ReductionOfDebtDiscountAndDebtIssuanceCostFromDebt
Namespace Prefix: | prpo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -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
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References No definition available. + Details
Name: | us-gaap_ConvertibleDebtFairValueDisclosures
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of short-term and long-term debt and lease obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
Name: | us-gaap_DebtAndCapitalLeaseObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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

X
- Definition The amount of 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 cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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_DebtConversionOriginalDebtAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of a favorable spread to a debt holder between the amount of debt being converted and the value of the securities received upon conversion. This is an embedded conversion feature of convertible debt issued that is in-the-money at the commitment date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 + Details
Name: | us-gaap_DebtInstrumentConvertibleBeneficialConversionFeature
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870 + Details
Name: | us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
Name: | us-gaap_DebtInstrumentConvertibleConversionRatio1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentConvertibleThresholdTradingDays
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
Name: | us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after accumulated amortization, of debt premium. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 + Details
Name: | us-gaap_DebtInstrumentUnamortizedPremium
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
Name: | us-gaap_DeferredFinanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=118948506&loc=SL51823488-111719 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875 + Details
Name: | us-gaap_FairValueAdjustmentOfWarrants
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 + Details
Name: | us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Aggregate net gain and losses (whether realized or unrealized) on all derivative instruments held for trading purposes whether or not settled physically. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4F -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624186-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41322-113958 + Details
Name: | us-gaap_GainLossOnDerivativeInstrumentsHeldForTradingPurposesNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of cash outflow for fees classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585 + Details
Name: | us-gaap_PaymentsForFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromConvertibleDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_WarrantsAndRightsOutstandingTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value portion of warrants not settleable in cash classified as equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_WarrantsNotSettleableInCashFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_WriteOffOfDeferredDebtIssuanceCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=prpo_BridgeNotesBeneficialConversionFeaturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=prpo_BridgeNotesRedemptionFeatureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=prpo_ConvertiblePromissoryNoteWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=prpo_April2018WarrantsFirstHalfMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=prpo_April2018WarrantsSecondHalfMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=prpo_April2018WarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=prpo_AmendedWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=prpo_AdvisorWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=prpo_ConvertiblePromissoryNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=prpo_Quarter32018WarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=prpo_Quarter42018WarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=prpo_NoteAgreement2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=prpo_ConvertibleBridgeLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=prpo_Quarter32018BridgeNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=prpo_April2018BridgeNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=prpo_May2019BridgeNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=prpo_Quarter42018BridgeNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=prpo_AmendmentAndRestatementAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherCurrentAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=prpo_July2018BridgeNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=prpo_August2018BridgeNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=prpo_September2018BridgeNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=prpo_April2019BridgeNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |