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GENERAL (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2015
Dec. 31, 2013
Aug. 31, 2011
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2014
GENERAL [Abstract]                
Accumulated deficit $ (133,216)us-gaap_RetainedEarningsAccumulatedDeficit     $ (133,216)us-gaap_RetainedEarningsAccumulatedDeficit   $ (133,216)us-gaap_RetainedEarningsAccumulatedDeficit   $ (113,834)us-gaap_RetainedEarningsAccumulatedDeficit
Net loss       (7,226)us-gaap_NetIncomeLoss (9,276)us-gaap_NetIncomeLoss (19,382)us-gaap_NetIncomeLoss (20,736)us-gaap_NetIncomeLoss  
Upfront payment received     7,000us-gaap_LicensesRevenue          
Nonrefundable payments received     5,000us-gaap_RevenueFromGrants          
Advance payment on the development     2,000us-gaap_ProceedsFromCustomers          
Milestone revenue receivable           37,500psti_ResearchAndDevelopmentMilestoneRevenueReceivable    
Reimbursement revenue receivable           10,000us-gaap_ReimbursementRevenue    
Issuance of common stock under CHA agreement   2,500,000us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets            
CHA shares classified as marketable securities   1,011,504psti_AvailableForSaleMarketableSecuritiesNumber            
Total consideration reflected under the CHA agreement   10,414us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets         10,414us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets  
Net proceeds from sale of portion of the CHA shares 5,717us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities         9,879us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 3,875us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities  
Net gain from sale of portion of the CHA shares 282us-gaap_MarketableSecuritiesRealizedGainLoss         (290)us-gaap_MarketableSecuritiesRealizedGainLoss (108)us-gaap_MarketableSecuritiesRealizedGainLoss  
Fair value of the remaining investment in CHA shares $ 5,543us-gaap_AvailableForSaleSecuritiesCurrent     $ 5,543us-gaap_AvailableForSaleSecuritiesCurrent   $ 5,543us-gaap_AvailableForSaleSecuritiesCurrent