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STOCK TRANSACTIONS (Details) (Officers And Certain Employees [Member], Option to purchase shares of common stock [Member], USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended
Mar. 23, 2015
Class of Stock [Line Items]  
Option granted (in shares) 1,909,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Term of option 10 years
Exercise price (in dollars per share) $ 1.72us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Vesting period 4 years
Fair value of option on the date of grant $ 1.9plx_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValue
Dividend yield 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Expected volatility 61.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Risk free interest rate 1.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Expected life in years 6 years
Vest on the first anniversary of the grant date [Member]
 
Class of Stock [Line Items]  
Percentage of options vested 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= plx_OfficersAndCertainEmployeesMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheOneMember
Vest over the subsequent quarterly period
 
Class of Stock [Line Items]  
Number of installments for vesting of stock 12plx_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfInstallmentsForVestingPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= plx_OfficersAndCertainEmployeesMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Vesting period 3 years