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STOCKHOLDERS' EQUITY (Summary of RSU Activity to Consultants) (Details) (Consultants [Member])
6 Months Ended
Dec. 31, 2014
Consultants [Member]
 
Share-based Goods and Nonemployee Services Transaction [Line Items]  
Unvested at the beginning of period 15,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= psti_ConsultantsMember
Granted 50,180us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= psti_ConsultantsMember
Forfeited   
Vested (45,430)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= psti_ConsultantsMember
Unvested at the end of the period 20,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= psti_ConsultantsMember
Expected to vest 20,000psti_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVest
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= psti_ConsultantsMember