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STOCKHOLDERS' EQUITY (Schedule of Compensation Expense) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Options and warrants [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Compensation expenses       $ 1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= psti_EquityOptionsAndWarrantsMember
$ 2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= psti_EquityOptionsAndWarrantsMember
Restricted stock units [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Compensation expenses 603us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
1,143us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
1,638us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
2,317us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Unrecognized compensation expense 870us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
  870us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Unrecognized compensation expense, recognition period     2 years  
Restricted stock units [Member] | Consultants [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Compensation expenses 91us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= psti_ConsultantsMember
16us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= psti_ConsultantsMember
115us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= psti_ConsultantsMember
17us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= psti_ConsultantsMember
Research and development expenses [Member] | Options and warrants [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Compensation expenses       1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= psti_EquityOptionsAndWarrantsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= psti_EquityOptionsAndWarrantsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
Research and development expenses [Member] | Restricted stock units [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Compensation expenses 162us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
88us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
495us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
214us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
Research and development expenses [Member] | Restricted stock units [Member] | Consultants [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Compensation expenses 57us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= psti_ConsultantsMember
16us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= psti_ConsultantsMember
77us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= psti_ConsultantsMember
17us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= psti_ConsultantsMember
General and administrative expenses [Member] | Options and warrants [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Compensation expenses            
General and administrative expenses [Member] | Restricted stock units [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Compensation expenses 441us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
1,055us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
1,143us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
2,103us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
General and administrative expenses [Member] | Restricted stock units [Member] | Consultants [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Compensation expenses $ 34us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= psti_ConsultantsMember
   $ 38us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= psti_ConsultantsMember