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MARKETABLE SECURITIES (Schedule of Available-for-sale Marketable Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 19,711us-gaap_AvailableForSaleSecuritiesAmortizedCost	$ 27,025us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross unrealized gain	1,815us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax	2,965us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Gross unrealized loss	(280)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax	(29)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Fair value	21,246us-gaap_AvailableForSaleSecurities	29,961us-gaap_AvailableForSaleSecurities
Within One Year [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	13,493us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember	19,430us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
Gross unrealized gain	1,693us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember	2,585us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
Gross unrealized loss	(203)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember	(23)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
Fair value	14,983us-gaap_AvailableForSaleSecurities / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember	21,992us-gaap_AvailableForSaleSecurities / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
One to Five Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	6,084us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember	7,501us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember
Gross unrealized gain	117us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember	361us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember
Gross unrealized loss	(76)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember	(6)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember
Fair value	6,125us-gaap_AvailableForSaleSecurities / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember	7,856us-gaap_AvailableForSaleSecurities / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember
After Five Years through Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	134us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember	94us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember
Gross unrealized gain	5us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember	19us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember
Gross unrealized loss	(1)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember
Fair value	138us-gaap_AvailableForSaleSecurities / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember	113us-gaap_AvailableForSaleSecurities / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember
Stock and Index Linked Notes [Member] | Within One Year [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	12,090us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember	18,881us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
Gross unrealized gain	1,662us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember	2,522us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
Gross unrealized loss	(133)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember	(23)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
Fair value	13,619us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember	21,380us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
Government Debentures [Member] | Within One Year [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	292us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember	97us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
Gross unrealized gain	2us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember	9us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
Gross unrealized loss	(12)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
Fair value	282us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember	106us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
Government Debentures [Member] | One to Five Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	2,247us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember	2,595us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember
Gross unrealized gain	33us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember	98us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember
Gross unrealized loss	(39)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember	(1)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember
Fair value	2,241us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember	2,692us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember
Corporate Debentures [Member] | Within One Year [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	1,111us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember	452us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
Gross unrealized gain	29us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember	54us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
Gross unrealized loss	(58)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
Fair value	1,082us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember	506us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
Corporate Debentures [Member] | One to Five Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	3,837us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember	4,906us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember
Gross unrealized gain	84us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember	263us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember
Gross unrealized loss	(37)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember	(5)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember
Fair value	3,884us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember	5,164us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember
Corporate Debentures [Member] | After Five Years through Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	134us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember	94us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember
Gross unrealized gain	5us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember	19us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember
Gross unrealized loss	(1)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember
Fair value	$ 138us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember	$ 113us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember

X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

+ References

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-Publisher FASB

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