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INTERIM CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (12,156)us-gaap_NetIncomeLoss $ (11,460)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 1,002us-gaap_Depreciation 937us-gaap_Depreciation
Loss on property and equipment    35us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Accretion of discount, amortization of premium and changes in accrued interest of marketable securities 145psti_AmortizationOfDiscountAndPremiumAndChangesInAccruedInterestFromMarketableSecurities 465psti_AmortizationOfDiscountAndPremiumAndChangesInAccruedInterestFromMarketableSecurities
Gain from sale of investments of available-for-sale marketable securities (197)us-gaap_MarketableSecuritiesRealizedGainLoss (164)us-gaap_MarketableSecuritiesRealizedGainLoss
Stock-based compensation to employees, directors and non-employees consultants 1,754us-gaap_ShareBasedCompensation 2,336us-gaap_ShareBasedCompensation
Decrease (increase) in OCS receivables 2,105us-gaap_IncreaseDecreaseInOtherReceivables (277)us-gaap_IncreaseDecreaseInOtherReceivables
Decrease (increase) in other accounts receivable 181us-gaap_IncreaseDecreaseInAccountsReceivable (124)us-gaap_IncreaseDecreaseInAccountsReceivable
Decrease (increase) in prepaid expenses (365)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 116us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Increase (decrease) in trade payables (772)us-gaap_IncreaseDecreaseInAccountsPayable 488us-gaap_IncreaseDecreaseInAccountsPayable
Decrease in other accounts payable and accrued expenses (417)us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities (167)us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities
Decrease in deferred revenues (190)us-gaap_IncreaseDecreaseInDeferredRevenue (190)us-gaap_IncreaseDecreaseInDeferredRevenue
Decrease in advance payment from United Therapeutics (104)us-gaap_IncreaseDecreaseInCustomerAdvances (96)us-gaap_IncreaseDecreaseInCustomerAdvances
Increase in interest receivable on short-term deposits (14)us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet   
Linkage differences and interest on short and long-term deposits 65psti_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit 1psti_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit
Accrued severance pay, net (63)us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations (7)us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations
Net cash used by operating activities (9,026)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (8,107)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (552)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,169)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Repayment of short-term deposits 11,072us-gaap_PaymentsForProceedsFromShortTermInvestments 7,961us-gaap_PaymentsForProceedsFromShortTermInvestments
Repayment of (investment in) long-term deposits 3us-gaap_PaymentsForProceedsFromLongtermInvestments (3)us-gaap_PaymentsForProceedsFromLongtermInvestments
Repayment of long-term restricted deposit    116us-gaap_IncreaseDecreaseInRestrictedCashAndInvestments
Proceeds from sale of available-for-sale marketable securities 2,409us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 2,963us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Proceeds from redemption of available-for-sale marketable securities 301us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 583us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Investment in available-for-sale marketable securities (2,513)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (7,904)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Net cash provided by investing activities 10,720us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 2,547us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
CASH FLOWS FROM FINANCING ACTIVITIES:    
Exercise of options and warrants 246us-gaap_ProceedsFromStockOptionsExercised 1,179us-gaap_ProceedsFromStockOptionsExercised
Proceeds from issuance of common stock in a private placement 528us-gaap_ProceedsFromIssuanceOfPrivatePlacement   
Net cash provided by financing activities 774us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 1,179us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Increase (decrease) in cash and cash equivalents 2,468us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (4,381)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 6,961us-gaap_CashAndCashEquivalentsAtCarryingValue 4,626us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow activities:    
Taxes paid due to non-deductible expenses 17us-gaap_IncomeTaxesPaid 35us-gaap_IncomeTaxesPaid
Supplemental disclosure of non-cash activities:    
Purchase of property and equipment on credit 72us-gaap_CapitalExpendituresIncurredButNotYetPaid 258us-gaap_CapitalExpendituresIncurredButNotYetPaid
Issuance of common stock under CHA agreement    $ 10,414us-gaap_NoncashOrPartNoncashAcquisitionInvestmentsAcquired1