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STOCKHOLDERS' EQUITY (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 9 Months Ended 1 Months Ended
Feb. 28, 2015
Oct. 31, 2014
Mar. 31, 2015
Dec. 31, 2014
Class of Stock [Line Items]        
Issuance of common stock in a private placement, shares 200,000psti_StockIssuedDuringPeriodSharesPrivatePlacement 200,000psti_StockIssuedDuringPeriodSharesPrivatePlacement    
Issuance of common stock in a private placement $ 586psti_StockIssuedDuringPeriodValuePrivatePlacement $ 528psti_StockIssuedDuringPeriodValuePrivatePlacement $ 1,114psti_StockIssuedDuringPeriodValuePrivatePlacement  
Stock based compensation to contractor         
Common Stock [Member]        
Class of Stock [Line Items]        
Issuance of common stock in a private placement, shares     400,000psti_StockIssuedDuringPeriodSharesPrivatePlacement
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		  
Issuance of common stock in a private placement        [1]  
Stock based compensation to contractor, shares     100,004us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 100,004us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Stock based compensation to contractor        [1]  
Additional Paid-in Capital [Member]        
Class of Stock [Line Items]        
Issuance of common stock in a private placement     1,114psti_StockIssuedDuringPeriodValuePrivatePlacement
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		  
Stock based compensation to contractor     280us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		  
Investor Warrants [Member]        
Class of Stock [Line Items]        
Warrants exercised via cashless exercise     1,531,367us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_ClassOfWarrantOrRightAxis
= psti_InvestorWarrantsMember		  
Warrants exercised via cashless exercise, shares issued     694,326us-gaap_ConversionOfStockSharesIssued1
/ us-gaap_ClassOfWarrantOrRightAxis
= psti_InvestorWarrantsMember		  
Warrants exercised for cash     147,667us-gaap_StockIssuedDuringPeriodSharesOther
/ us-gaap_ClassOfWarrantOrRightAxis
= psti_InvestorWarrantsMember		  
Number of warrants exercised     147,667psti_SharebasedCompensationArrangementWarrantsExercised
/ us-gaap_ClassOfWarrantOrRightAxis
= psti_InvestorWarrantsMember		  
Aggregate cash consideration received     $ 244us-gaap_ProceedsFromWarrantExercises
/ us-gaap_ClassOfWarrantOrRightAxis
= psti_InvestorWarrantsMember		  
[1] Less than $1