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TAXES ON INCOME (Valuation Allowance) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
TAXES ON INCOME |  |
Beginning Balance | $ (58,550) | $ (61,520)
Additions to valuation allowance | (728) |
Reductions to valuation allowance | 7,660 | 2,970
Ending Balance | $ (51,618) | $ (58,550)

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- Definition Amount of additions to the valuation allowance for deferred tax asset. + References No definition available. + Details
Name: | plx_DeferredTaxAssetsValuationAllowanceAdditionsDuringPeriod
Namespace Prefix: | plx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of reductions to the valuation allowance for deferred tax asset. + References No definition available. + Details
Name: | plx_DeferredTaxAssetsValuationAllowanceReductionsDuringPeriod
Namespace Prefix: | plx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration