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GENERAL (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2013
Aug. 31, 2011
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2014
GENERAL [Abstract]              
Accumulated deficit     $ (125,990)us-gaap_RetainedEarningsAccumulatedDeficit   $ (125,990)us-gaap_RetainedEarningsAccumulatedDeficit   $ (113,834)us-gaap_RetainedEarningsAccumulatedDeficit
Net loss     (6,245)us-gaap_NetIncomeLoss (6,705)us-gaap_NetIncomeLoss (12,156)us-gaap_NetIncomeLoss (11,460)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     1,011,504psti_AvailableForSaleMarketableSecuritiesNumber   1,011,504psti_AvailableForSaleMarketableSecuritiesNumber  
Total consideration reflected under the CHA agreement $ 10,414us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets         $ 10,414us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets