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SHARE CAPITAL (Summary of Option and Restricted Stock Granted to Employees) (Details) (Employees [Member], USD $)
12 Months Ended
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of options or restricted stock granted 2,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
2012 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of options or restricted stock granted 400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= plx_GrantYearTwoThousandTwelveMember
/ us-gaap_TitleOfIndividualAxis
= plx_EmployeesMember
Vesting period 3 years
Fair value of at grant date 2,288,000plx_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValue
/ us-gaap_PlanNameAxis
= plx_GrantYearTwoThousandTwelveMember
/ us-gaap_TitleOfIndividualAxis
= plx_EmployeesMember
2012 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of options or restricted stock granted 1,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= plx_GrantYearTwoThousandTwelveSecondMember
/ us-gaap_TitleOfIndividualAxis
= plx_EmployeesMember
Vesting period 4 years
Fair value of at grant date 6,292,000plx_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValue
/ us-gaap_PlanNameAxis
= plx_GrantYearTwoThousandTwelveSecondMember
/ us-gaap_TitleOfIndividualAxis
= plx_EmployeesMember
2014 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of options or restricted stock granted 900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= plx_GrantYearTwoThousandFourteenMember
/ us-gaap_TitleOfIndividualAxis
= plx_EmployeesMember
Exercise price 2.37us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= plx_GrantYearTwoThousandFourteenMember
/ us-gaap_TitleOfIndividualAxis
= plx_EmployeesMember
Vesting period 4 years
Fair value of at grant date 1,007,000plx_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValue
/ us-gaap_PlanNameAxis
= plx_GrantYearTwoThousandFourteenMember
/ us-gaap_TitleOfIndividualAxis
= plx_EmployeesMember
Expiration period 10 years