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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN CAPITAL DEFICIENCY (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Balance $ (55,601)us-gaap_StockholdersEquity $ (26,946)us-gaap_StockholdersEquity
Share-based compensation related to stock options 202us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue 162us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Share-based compensation related to restricted stock award, net of forfeitures 217plx_ShareBasedCompensationRestrictedStockAwardsNetOfForfeitures 508plx_ShareBasedCompensationRestrictedStockAwardsNetOfForfeitures
Exercise of options granted to employees (includes net exercise)   43us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Net loss for the period (5,972)us-gaap_NetIncomeLoss (7,345)us-gaap_NetIncomeLoss
Balance (61,154)us-gaap_StockholdersEquity (33,578)us-gaap_StockholdersEquity
Common Stock [Member]    
Balance, shares 93,603,819us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 93,551,098us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Balance 94us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 94us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Share-based compensation related to stock options      
Share-based compensation related to restricted stock award, net of forfeitures      
Share-based compensation related to restricted stock award, net of forfeitures (shares) (1,667)plx_ShareBasedCompensationRestrictedStockAwardsNetOfForfeituresShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		  
Exercise of options granted to employees (includes net exercise)      [1]
Exercise of options granted to employees (includes net exercise), shares   55,362us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Net loss for the period      
Balance 94us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 94us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Balance, shares 93,602,152us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 93,606,460us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Additional Paid-in Capital [Member]    
Balance 185,633us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 184,345us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
Share-based compensation related to stock options 202us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 162us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
Share-based compensation related to restricted stock award, net of forfeitures 217plx_ShareBasedCompensationRestrictedStockAwardsNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 508plx_ShareBasedCompensationRestrictedStockAwardsNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
Exercise of options granted to employees (includes net exercise)   43us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
Net loss for the period      
Balance 186,052us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 185,058us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
Accumulated Deficit [Member]    
Balance (241,328)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (211,385)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Share-based compensation related to stock options      
Share-based compensation related to restricted stock award, net of forfeitures      
Exercise of options granted to employees (includes net exercise)     
Net loss for the period (5,972)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (7,345)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance $ (247,300)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 $ (218,730)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
[1] Represents an amount less than $1.