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INTERIM CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
INTERIM CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Revenues	$ 95us-gaap_Revenues	$ 95us-gaap_Revenues	$ 190us-gaap_Revenues	$ 190us-gaap_Revenues
Cost of revenues	(4)us-gaap_CostOfRevenue	(3)us-gaap_CostOfRevenue	(7)us-gaap_CostOfRevenue	(6)us-gaap_CostOfRevenue
Gross profit	91us-gaap_GrossProfit	92us-gaap_GrossProfit	183us-gaap_GrossProfit	184us-gaap_GrossProfit
Research and development expenses	(5,385)us-gaap_ResearchAndDevelopmentExpense	(6,107)us-gaap_ResearchAndDevelopmentExpense	(11,121)us-gaap_ResearchAndDevelopmentExpense	(11,604)us-gaap_ResearchAndDevelopmentExpense
Less participation by the Office of the Chief Scientist and other parties	506psti_GovernmentAndThirdPartyGrantsReceived	1,000psti_GovernmentAndThirdPartyGrantsReceived	2,205psti_GovernmentAndThirdPartyGrantsReceived	3,374psti_GovernmentAndThirdPartyGrantsReceived
Research and development expenses, net	(4,879)psti_ResearchAndDevelopmentExpensesNet	(5,107)psti_ResearchAndDevelopmentExpensesNet	(8,916)psti_ResearchAndDevelopmentExpensesNet	(8,230)psti_ResearchAndDevelopmentExpensesNet
General and administrative expenses	(1,513)us-gaap_GeneralAndAdministrativeExpense	(1,975)us-gaap_GeneralAndAdministrativeExpense	(3,191)us-gaap_GeneralAndAdministrativeExpense	(3,804)us-gaap_GeneralAndAdministrativeExpense
Operating loss	(6,301)us-gaap_OperatingIncomeLoss	(6,990)us-gaap_OperatingIncomeLoss	(11,924)us-gaap_OperatingIncomeLoss	(11,850)us-gaap_OperatingIncomeLoss
Financial income (expense), net	56us-gaap_NonoperatingIncomeExpense	285us-gaap_NonoperatingIncomeExpense	(232)us-gaap_NonoperatingIncomeExpense	390us-gaap_NonoperatingIncomeExpense
Net loss for the period	$ (6,245)us-gaap_NetIncomeLoss	$ (6,705)us-gaap_NetIncomeLoss	$ (12,156)us-gaap_NetIncomeLoss	$ (11,460)us-gaap_NetIncomeLoss
Loss per share:
Basic and diluted net loss per share	$ (0.09)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.11)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.17)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.19)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average number of shares used in computing basic and diluted net loss per share	70,070,509us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	61,510,550us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	69,610,528us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	60,379,352us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted

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