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SHARE CAPITAL (Options and Restricted Stocks Granted to Consultants, Directors and Other Service Providers) (Details) (Options and Restricted Stocks Granted To Consultants Directors And Other Service Providers [Member], USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Options and Restricted Stocks Granted To Consultants Directors And Other Service Providers [Member]
     
Number of options      
Outstanding at beginning of year 912,425us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
912,425us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
1,238,692us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
Granted 296,167us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
     
Exercised    [1]    [1] 326,267us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
[1]
Outstanding at end of year 1,208,592us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
912,425us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
912,425us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
Exercisable at end of year 912,425us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
912,425us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
912,425us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
Weighted average exercise price      
Outstanding at beginning of year $ 7.259us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
$ 7.259us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
$ 5.385us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
Granted $ 2.678us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
     
Exercised    [1]    [1] $ 0.12us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
[1]
Outstanding at end of year $ 6.136us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
$ 7.259us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
$ 7.259us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
Exercisable at end of year $ 7.259us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
$ 7.259us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
$ 7.259us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
Intrinsic value of options exercised     $ 2,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_TitleOfIndividualAxis
= plx_OptionsAndRestrictedStocksGrantedToConsultantsDirectorsAndOtherServiceProvidersMember
[1] (*) The total intrinsic value of options exercised during the year ended December 31, 2012 was approximately $2.3 million.