XML 75 R58.htm IDEA: XBRL DOCUMENT
v3.21.1

CONVERTIBLE NOTES - Additional information (Details) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 07, 2016 USD ($) shares | Dec. 01, 2016 USD ($) | Jun. 30, 2018 USD ($) shares | Jul. 24, 2017 USD ($) | Dec. 31, 2020 USD ($) D $ / shares shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) | Sep. 18, 2013 USD ($)
Net proceeds from issuance of convertible notes |  |  |  | $ 9,500,000 |  |  |  |  |
Amount of redemption of debt |  |  |  |  | $ 0 | $ 0 |  |  |
Percentage of outstanding capital stock |  |  |  |  | 100.00% |  |  |  |
Converted instrument, shares issued | shares | 2,384,673 |  |  |  |  |  |  |  |
Net payment for convertible notes |  |  |  |  |  |  | $ 4,752,000 |  |
Promissory note |  |  |  |  | $ 4,086,000 | $ 4,301,000 |  |  |
Convertible Notes Payable [Member] |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 69,000,000.0
2021 Notes [Member] |  |  |  |  |  |  |  |  |
Principal amount |  | $ 22,500,000 |  | 10,000,000.0 |  |  |  |  |
Number of shares for basis conversion | shares |  |  |  |  | 117.64706 |  |  |  |
Net proceeds from issuance of convertible notes |  | $ 19,700,000 |  |  |  |  |  |  |
Interest rate |  | 7.50% |  |  | 7.50% |  |  |  |
Conversion price per share | $ / shares |  |  |  |  | $ 8.50 |  |  |  |
Base value for conversion rate |  |  |  |  | $ 1,000 |  |  |  |
Minimum cash balance required |  |  |  |  | $ 7,500,000 |  |  |  |
Maximum price per share of the conversion feature | shares |  |  |  |  | 178.73100 |  |  |  |
Denomination of the principal amount of debt |  |  |  |  | $ 1,000 |  |  |  |
Redemption price, percentage |  |  |  |  | 100.00% |  |  |  |
2021 Notes [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Number of calendar days after the date of applicable fundamental change purchase date | D |  |  |  |  | 20 |  |  |  |
2021 Notes [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Number of calendar days after the date of applicable fundamental change purchase date | D |  |  |  |  | 35 |  |  |  |
4.5% Convertible Notes [Member] |  |  |  |  |  |  |  |  |
Principal amount |  | $ 54,100,000 | $ 3,423,000 | $ 9,000,000.0 |  |  |  | $ 54,100,000 |
Debt conversion converted instrument amount, cash |  |  | $ 2,230,000 |  |  |  |  |  |
Converted instrument, shares issued | shares |  |  | 261,363 |  |  |  |  |  |
Net payment for convertible notes |  |  | $ 2,530,000 |  |  |  |  |  |
Convertible Notes Due Two Thousand Twenty One [Member] |  |  |  |  |  |  |  |  |
Principal amount | $ 40,186,000 |  |  |  |  |  |  |  |
Convertible Notes 2013 [Member] |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 4.50%
2021 Notes [Member] |  |  |  |  |  |  |  |  |
Redemption, description |  |  |  |  |  |  | Prior to the maturity date, the Company may redeem in cash: |  |
Converted instrument, shares issued | shares |  |  |  |  |  |  | 153,742 |  |
Net payment for convertible notes |  |  |  |  |  |  | $ 15,887 |  |
Promissory note |  |  |  |  | $ 57,900,000 |  |  |  |
Debt conversion, original debt, amount |  |  |  |  |  |  | $ 1,150,000 |  |
Four Point Five Percentage Convertible Notes 2022 [Member] |  |  |  |  |  |  |  |  |
Maturity |  |  |  |  | Nov. 15, 2021 |  |  |  |
Four Point Five Percentage Convertible Notes 2018 [Member] |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 4.50% |  |  |  |

X
- Definition The value of the financial instrument(s) that the original debt is being converted into in a cash transaction. "Cash" refers to that portion of the transaction resulting in cash receipts or cash payments in the period. + References No definition available. + Details
Name: | plx_DebtConversionConvertedInstrumentAmountCash
Namespace Prefix: | plx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Debt Instrument Convertible Base Value For Conversion Rate + References No definition available. + Details
Name: | plx_DebtInstrumentConvertibleBaseValueForConversionRate
Namespace Prefix: | plx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Debt Instrument Convertible Conversion Share Number + References No definition available. + Details
Name: | plx_DebtInstrumentConvertibleConversionShareNumber
Namespace Prefix: | plx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the denomination of the principal amount of debt that is used in conversion calculations. + References No definition available. + Details
Name: | plx_DebtInstrumentPrincipalAmountDenominationForConversionIntoCommonStock
Namespace Prefix: | plx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of redemption of debt as at the end of the reporting period. + References No definition available. + Details
Name: | plx_DebtInstrumentRedemption
Namespace Prefix: | plx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Minimum cash balance required to be maintained under long term debt agreements. + References No definition available. + Details
Name: | plx_MaintainOfMinimumCashBalance
Namespace Prefix: | plx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The maximum price per share of the conversion feature embedded in the debt instrument. + References No definition available. + Details
Name: | plx_MaximumDebtInstrumentConvertibleConversionShareNumber
Namespace Prefix: | plx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of calendar days after the date of applicable fundamental change purchase date. + References No definition available. + Details
Name: | plx_NumberOfCalendarDaysAfterDateOfApplicableFundamentalChange
Namespace Prefix: | plx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of outstanding capital stock. + References No definition available. + Details
Name: | plx_PercentageOfOutstandingCapitalStock
Namespace Prefix: | plx_
Data Type: | num:percentItemType
Balance Type: | na
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 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 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 Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of debt redemption features under terms of the debt agreement. + 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_DebtInstrumentRedemptionDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of principal amount of debt redeemed. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_NotesPayableCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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 The cash outflow from the repayment 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 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
Name: | us-gaap_RepaymentsOfConvertibleDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_ShortTermDebtTypeAxis=us-gaap_ConvertibleNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=plx_ConvertibleNotes2013Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=plx_SevenPointFivePercentageConvertibleNotes2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=plx_FourPointFivePercentageConvertibleNotes2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |