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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    $ 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
       
Exercise of options and warrants by employees and consultants                 
Exercise of options and warrants by employees and consultants, shares   7,405psti_StockIssuedDuringPeriodSharesStockOptionsAndWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Exercise of warrants by investors and finders 1,179psti_StockIssuedDuringPeriodValueStockWarrantsExercised    1,179psti_StockIssuedDuringPeriodValueStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
       
Exercise of warrants by investors and finders, shares   1,942,474psti_StockIssuedDuringPeriodSharesStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Stock based compensation to employees, directors and non-employee consultants 2,336us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation    2,336us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
       
Stock based compensation to employees, directors and non-employee consultants, shares   746,027us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Issuance of common stock under CHA agreement (Note 1d) 10,414us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets    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 899us-gaap_OtherComprehensiveIncomeLossNetOfTax         899us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
  
Net loss (11,460)us-gaap_NetIncomeLoss            (11,460)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance at Dec. 31, 2013 60,834us-gaap_StockholdersEquity    158,038us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
  1,158us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(98,362)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance, shares at Dec. 31, 2013   64,392,523us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Balance at Jun. 30, 2014 62,123us-gaap_StockholdersEquity    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 2us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised    2us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
        
Exercise of options by employees, shares 3,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 3,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Exercise of warrants by investors and finders 244psti_StockIssuedDuringPeriodValueStockWarrantsExercised    244psti_StockIssuedDuringPeriodValueStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
        
Exercise of warrants by investors and finders, shares   822,734psti_StockIssuedDuringPeriodSharesStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Stock based compensation to employees, directors and non-employee consultants 1,754us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation    1,754us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
        
Stock based compensation to employees, directors and non-employee consultants, shares   767,673us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Issuance of common stock in a private placement 528psti_StockIssuedDuringPeriodValuePrivatePlacement    528psti_StockIssuedDuringPeriodValuePrivatePlacement
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
        
Issuance of common stock in a private placement, shares   200,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Stock based compensation to contractor       250us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(250)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 (3,358)us-gaap_OtherComprehensiveIncomeLossNetOfTax          (3,358)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
  
Net loss (12,156)us-gaap_NetIncomeLoss             (12,156)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance at Dec. 31, 2014 49,137us-gaap_StockholdersEquity    175,776us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(250)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ReceivablesFromStockholderMember
(399)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(125,990)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance, shares at Dec. 31, 2014 70,494,863us-gaap_CommonStockSharesOutstanding 70,494,863us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Balance at Nov. 30, 2014            
Stock based compensation to contractor   250us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Stock based compensation to contractor, shares   100,004us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Balance at Dec. 31, 2014             
Balance, shares at Dec. 31, 2014   70,494,863us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember