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STOCKHOLDERS' EQUITY (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
1 Months Ended 6 Months Ended 1 Months Ended
Oct. 31, 2014
Dec. 31, 2014
Dec. 31, 2014
Class of Stock [Line Items]      
Issuance of common stock in a private placement, shares 200,000us-gaap_StockIssuedDuringPeriodSharesNewIssues    
Issuance of common stock in a private placement $ 528us-gaap_StockIssuedDuringPeriodValueNewIssues    
Stock based compensation to contractor       
Common Stock [Member]      
Class of Stock [Line Items]      
Issuance of common stock in a private placement, shares   200,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
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      250us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Investor Warrants [Member]      
Class of Stock [Line Items]      
Warrants exercised via cashless exercise   1,449,010us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_ClassOfWarrantOrRightAxis
= psti_InvestorWarrantsMember
 
Warrants exercised via cashless exercise, shares issued   675,067us-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