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COMMITMENTS AND CONTINGENCIES (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
1 Months Ended 9 Months Ended
Feb. 28, 2015
Mar. 31, 2015
Other Commitments [Line Items]    
Decrease in cash pledged   $ (3,969)us-gaap_IncreaseDecreaseInRestrictedCash
Grants received   18,131psti_AggregateGrantsReceived
Royalty payable based on grants received   100.00%psti_RoyaltyRatePayableOnGrantsReceived
Accrued and paid royalties   63psti_RoyaltiesAmountPaidAndAccrued
Contingent liability amount   18,068us-gaap_RoyaltyGuaranteesCommitmentsAmount
Non-refundable payment agreed to be paid by lessor 925psti_NonRefundablePaymentAgreedToBePaidByLessor  
Value of restricted stock to be issued to contractor, upon completion of future milestone     
Scenario, Forecast [Member]    
Other Commitments [Line Items]    
Value of restricted stock to be issued to contractor, upon completion of future milestone $ 419us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
 
Restricted stocks to be issued to contractor, upon completion of future milestone 100,004us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
 
Minimum [Member]    
Other Commitments [Line Items]    
Royalty rate   3.00%psti_RoyaltyRateSales
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]    
Other Commitments [Line Items]    
Royalty rate   4.00%psti_RoyaltyRateSales
/ us-gaap_RangeAxis
= us-gaap_MaximumMember