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INTERIM CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
INTERIM CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Revenues	$ 95us-gaap_Revenues	$ 95us-gaap_Revenues	$ 285us-gaap_Revenues	$ 285us-gaap_Revenues
Cost of revenues	(3)us-gaap_CostOfRevenue	(3)us-gaap_CostOfRevenue	(10)us-gaap_CostOfRevenue	(9)us-gaap_CostOfRevenue
Gross profit	92us-gaap_GrossProfit	92us-gaap_GrossProfit	275us-gaap_GrossProfit	276us-gaap_GrossProfit
Research and development expenses	(6,182)us-gaap_ResearchAndDevelopmentExpense	(6,885)us-gaap_ResearchAndDevelopmentExpense	(17,303)us-gaap_ResearchAndDevelopmentExpense	(18,489)us-gaap_ResearchAndDevelopmentExpense
Less participation by the Office of the Chief Scientist and other parties	88psti_GovernmentAndThirdPartyGrantsReceived	37psti_GovernmentAndThirdPartyGrantsReceived	2,293psti_GovernmentAndThirdPartyGrantsReceived	3,411psti_GovernmentAndThirdPartyGrantsReceived
Research and development expenses, net	(6,094)psti_ResearchAndDevelopmentExpensesNet	(6,848)psti_ResearchAndDevelopmentExpensesNet	(15,010)psti_ResearchAndDevelopmentExpensesNet	(15,078)psti_ResearchAndDevelopmentExpensesNet
General and administrative expenses	(1,527)us-gaap_GeneralAndAdministrativeExpense	(2,531)us-gaap_GeneralAndAdministrativeExpense	(4,718)us-gaap_GeneralAndAdministrativeExpense	(6,335)us-gaap_GeneralAndAdministrativeExpense
Operating loss	(7,529)us-gaap_OperatingIncomeLoss	(9,287)us-gaap_OperatingIncomeLoss	(19,453)us-gaap_OperatingIncomeLoss	(21,137)us-gaap_OperatingIncomeLoss
Financial income, net	303us-gaap_NonoperatingIncomeExpense	11us-gaap_NonoperatingIncomeExpense	71us-gaap_NonoperatingIncomeExpense	401us-gaap_NonoperatingIncomeExpense
Net loss for the period	$ (7,226)us-gaap_NetIncomeLoss	$ (9,276)us-gaap_NetIncomeLoss	$ (19,382)us-gaap_NetIncomeLoss	$ (20,736)us-gaap_NetIncomeLoss
Loss per share:
Basic and diluted net loss per share	$ (0.10)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.14)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.28)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.33)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average number of shares used in computing basic and diluted net loss per share	70,668,008us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	65,607,976us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	69,954,373us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	62,098,498us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted

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