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INTERIM CONDENSED STATEMENTS OF CHANGES IN EQUITY (USD $)
In Thousands, except Share data
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Receivables on account of shares [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Deficit [Member]
Balance at Jun. 30, 2013 $ 57,466us-gaap_StockholdersEquity    [1] $ 144,109us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		   $ 259us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 $ (86,902)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance, shares at Jun. 30, 2013   59,196,617us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Issuance of common stock under At-the-Market sales agreement, net of issuance costs of $184 10,149us-gaap_StockIssuedDuringPeriodValueNewIssues    [1] 10,149us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		        
Issuance of common stock under At-the-Market sales agreement, net of issuance costs of $184, shares   2,443,786us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Exercise of options and warrants by employees and consultants 12psti_StockIssuedDuringPeriodValueStockOptionsAndWarrantsExercised    [1] 12psti_StockIssuedDuringPeriodValueStockOptionsAndWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		        
Exercise of options and warrants by employees and consultants, shares   22,405psti_StockIssuedDuringPeriodSharesStockOptionsAndWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Exercise of warrants by investors and finders 1,859psti_StockIssuedDuringPeriodValueStockWarrantsExercised    [1] 1,859psti_StockIssuedDuringPeriodValueStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		        
Exercise of warrants by investors and finders, shares   2,710,128psti_StockIssuedDuringPeriodSharesStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Stock based compensation to employees, directors and non-employee consultants 4,178us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation    [1] 4,178us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		        
Stock based compensation to employees, directors and non-employee consultants, shares   976,599us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Issuance of common stock under CHA Agreement (Note 1d) 10,414us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets    [1] 10,414us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		        
Issuance of common stock under CHA Agreement (Note 1d), shares   2,500,000us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Other comprehensive income (loss), net 2,616us-gaap_OtherComprehensiveIncomeLossNetOfTax         2,616us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		   
Net loss (20,736)us-gaap_NetIncomeLoss            (20,736)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance at Mar. 31, 2014 65,958us-gaap_StockholdersEquity    [1] 170,721us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		   2,875us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 (107,638)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance, shares at Mar. 31, 2014   67,849,535us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Balance at Jun. 30, 2014 62,123us-gaap_StockholdersEquity    [1] 172,998us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    2,959us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 (113,834)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance, shares at Jun. 30, 2014 68,601,452us-gaap_CommonStockSharesOutstanding 68,601,452us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Exercise of options by employees 7us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised    [1] 7us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		         
Exercise of options by employees, shares 8,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 8,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Exercise of warrants by investors and finders 244psti_StockIssuedDuringPeriodValueStockWarrantsExercised    [1] 244psti_StockIssuedDuringPeriodValueStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		         
Exercise of warrants by investors and finders, shares   841,993psti_StockIssuedDuringPeriodSharesStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Stock based compensation to employees, directors and non-employee consultants 2,912us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation    [1] 2,912us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		         
Stock based compensation to employees, directors and non-employee consultants, shares   1,091,562us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Issuance of common stock in a private placement 1,114psti_StockIssuedDuringPeriodValuePrivatePlacement    [1] 1,114psti_StockIssuedDuringPeriodValuePrivatePlacement
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		        
Issuance of common stock in a private placement, shares   400,000psti_StockIssuedDuringPeriodSharesPrivatePlacement
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Stock based compensation to contractor       [1] 280us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 (280)us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ReceivablesFromStockholderMember		      
Stock based compensation to contractor, shares   100,004us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Other comprehensive income (loss), net (1,463)us-gaap_OtherComprehensiveIncomeLossNetOfTax          (1,463)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		   
Net loss (19,382)us-gaap_NetIncomeLoss             (19,382)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance at Mar. 31, 2015 $ 45,555us-gaap_StockholdersEquity    [1] $ 177,555us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ (280)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ReceivablesFromStockholderMember		 $ 1,496us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 $ (133,216)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance, shares at Mar. 31, 2015 71,043,011us-gaap_CommonStockSharesOutstanding 71,043,011us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
[1] Less than $1