The total amount payable to entity for the achievement of regulatory and commercial milestones.

No definition available.

Name:	plx_AdditionalAmountPayableForAchievementOfRegulatoryAndCommercialMilestones
Namespace Prefix:	plx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The definition should be: "The maximum amount payable to the entity to cover development costs under agreement.

+ References

No definition available.

+ Details

Name:	plx_AdditionalAmountsPayableToCoverDevelopmentCosts
Namespace Prefix:	plx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Year when the debt instrument is scheduled to be fully repaid.

+ References

No definition available.

+ Details

Name:	plx_DebtInstrumentMaturityYear
Namespace Prefix:	plx_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum amount payable to entity to cover development costs in any year under agreement.

+ References

No definition available.

+ Details

Name:	plx_MaximumEntitlementOfDevelopmentCostsToCoverPerYear
Namespace Prefix:	plx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the payment as a percentage of future net sales.

+ References

No definition available.

+ Details

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Namespace Prefix:	plx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of upfront,non refundable and non creditable payment receivable under the agreement for licencing rights.

+ References

No definition available.

+ Details

Name:	plx_UpfrontNonrefundableNoncreditablePaymentReceivable
Namespace Prefix:	plx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

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

- 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://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

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Balance Type:
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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SUBSEQUENT EVENTS (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended			9 Months Ended
	Oct. 18, 2017	Oct. 17, 2017	Jul. 24, 2017	Sep. 30, 2017
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				4.50%
Debt Instrument, Maturity Year				2022
Four Point Five Percentage Convertible Notes [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			4.50%
Debt Instrument, Maturity Year			2018
Four Point Five Percentage Convertible Notes One [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			4.50%
Debt Conversion, Converted Instrument, Shares Issued				4,666,751
Debt Conversion, Original Debt, Amount				$ 3,550
Debt Instrument, Maturity Year			2022
Subsequent Event [Member] \| Maximum [Member]
Subsequent Event [Line Items]
Additional Amount Payable for Achievement of Regulatory and Commercial Milestones		$ 320,000
Subsequent Event [Member] \| Four Point Five Percentage Convertible Notes [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.50%
Subsequent Event [Member] \| Four Point Five Percentage Convertible Notes One [Member]
Subsequent Event [Line Items]
Debt Conversion, Converted Instrument, Shares Issued	5,882,353
Debt Conversion, Original Debt, Amount	$ 5,000
Debt Instrument, Maturity Year	2022
Subsequent Event [Member] \| Chiesi Agreement [Member]
Subsequent Event [Line Items]
Upfront, Non-refundable, Non-creditable Payment Receivable		25,000
Maximum Entitlement of Development Costs To Cover Per Year		10,000
Additional Amounts Payable To Cover Development Costs		$ 25,000
Subsequent Event [Member] \| Chiesi Agreement [Member] \| Minimum [Member]
Subsequent Event [Line Items]
Payment on Net Sales, Percentage		15.00%
Subsequent Event [Member] \| Chiesi Agreement [Member] \| Maximum [Member]
Subsequent Event [Line Items]
Payment on Net Sales, Percentage		35.00%