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INTERIM CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (19,382)us-gaap_NetIncomeLoss $ (20,736)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 1,498us-gaap_Depreciation 1,416us-gaap_Depreciation
Loss on property and equipment    35us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Accretion of discount, amortization of premium and changes in accrued interest of marketable securities 233psti_AmortizationOfDiscountAndPremiumAndChangesInAccruedInterestFromMarketableSecurities 267psti_AmortizationOfDiscountAndPremiumAndChangesInAccruedInterestFromMarketableSecurities
Gain from sale of investments of available-for-sale marketable securities 290us-gaap_MarketableSecuritiesRealizedGainLoss 108us-gaap_MarketableSecuritiesRealizedGainLoss
Stock-based compensation to employees, directors and non-employees consultants 2,912us-gaap_ShareBasedCompensation 4,178us-gaap_ShareBasedCompensation
Decrease (increase) in OCS receivables 2,059us-gaap_IncreaseDecreaseInOtherReceivables (10)us-gaap_IncreaseDecreaseInOtherReceivables
Decrease (increase) in other accounts receivable (180)us-gaap_IncreaseDecreaseInAccountsReceivable 67us-gaap_IncreaseDecreaseInAccountsReceivable
Increase in prepaid expenses (461)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (55)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Increase (decrease) in trade payables (836)us-gaap_IncreaseDecreaseInAccountsPayable 585us-gaap_IncreaseDecreaseInAccountsPayable
Increase (decrease) in other accounts payable, accrued expenses and other long-term liabilities (1,267)us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities 726us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities
Decrease in deferred revenues (285)us-gaap_IncreaseDecreaseInDeferredRevenue (285)us-gaap_IncreaseDecreaseInDeferredRevenue
Decrease in advance payment from United Therapeutics (123)us-gaap_IncreaseDecreaseInCustomerAdvances (132)us-gaap_IncreaseDecreaseInCustomerAdvances
Decrease in interest receivable on short-term deposits 19us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet   
Linkage differences and interest on short and long-term deposits (5)psti_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit (27)psti_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit
Accrued severance pay, net (60)us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations 98us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations
Net cash used by operating activities (15,588)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (13,765)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (638)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,436)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Repayment of short-term deposits 12,511us-gaap_PaymentsForProceedsFromShortTermInvestments 1,945us-gaap_PaymentsForProceedsFromShortTermInvestments
Repayment of (investment in) long-term deposits 10us-gaap_PaymentsForProceedsFromLongtermInvestments (3)us-gaap_PaymentsForProceedsFromLongtermInvestments
Repayment of long-term restricted deposit    117us-gaap_IncreaseDecreaseInRestrictedCashAndInvestments
Proceeds from sale of available-for-sale marketable securities 9,879us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 3,875us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Proceeds from redemption of available-for-sale marketable securities 440us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 687us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Investment in available-for-sale marketable securities (3,528)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (8,809)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Net cash provided (used) by investing activities 18,674us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (3,624)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
CASH FLOWS FROM FINANCING ACTIVITIES:    
Issuance of common stock and warrants, net of issuance costs 1,114us-gaap_ProceedsFromIssuanceOfPrivatePlacement 10,149us-gaap_ProceedsFromIssuanceOfPrivatePlacement
Exercise of options and warrants 251us-gaap_ProceedsFromStockOptionsExercised 1,871us-gaap_ProceedsFromStockOptionsExercised
Net cash provided by financing activities 1,365us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 12,020us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Increase (decrease) in cash and cash equivalents 4,451us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (5,369)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at the beginning of the period 4,493us-gaap_CashAndCashEquivalentsAtCarryingValue 9,007us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at the end of the period 8,944us-gaap_CashAndCashEquivalentsAtCarryingValue 3,638us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow activities:    
Taxes paid due to non-deductible expenses 47us-gaap_IncomeTaxesPaid 43us-gaap_IncomeTaxesPaid
Supplemental disclosure of non-cash activities:    
Purchase of property and equipment on credit 9us-gaap_CapitalExpendituresIncurredButNotYetPaid 146us-gaap_CapitalExpendituresIncurredButNotYetPaid
Issuance of common stock under CHA agreement    $ 10,414us-gaap_NoncashOrPartNoncashAcquisitionInvestmentsAcquired1