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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
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 19,711 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 27,025 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross unrealized gain | 1,815 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax | 2,965 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Gross unrealized loss | (280)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax | (29)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Fair value | 21,246 us-gaap_AvailableForSaleSecurities | 29,961 us-gaap_AvailableForSaleSecurities
Within One Year [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 13,493 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember | 19,430 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
Gross unrealized gain | 1,693 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember | 2,585 us-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 | 14,983 us-gaap_AvailableForSaleSecurities / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember | 21,992 us-gaap_AvailableForSaleSecurities / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
One to Five Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 6,084 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember | 7,501 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember
Gross unrealized gain | 117 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember | 361 us-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 | 6,125 us-gaap_AvailableForSaleSecurities / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember | 7,856 us-gaap_AvailableForSaleSecurities / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember
After Five Years through Ten Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 134 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember | 94 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember
Gross unrealized gain | 5 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember | 19 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember
Gross unrealized loss | (1)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember |
Fair value | 138 us-gaap_AvailableForSaleSecurities / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember | 113 us-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 | 12,090 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember | 18,881 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
Gross unrealized gain | 1,662 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember | 2,522 us-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 | 13,619 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember | 21,380 us-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 | 292 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember | 97 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
Gross unrealized gain | 2 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember | 9 us-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 | 282 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember | 106 us-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 | 2,247 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember | 2,595 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember
Gross unrealized gain | 33 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember | 98 us-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 | 2,241 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = psti_GovernmentDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember | 2,692 us-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 | 1,111 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember | 452 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember
Gross unrealized gain | 29 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember | 54 us-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 | 1,082 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember | 506 us-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 | 3,837 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember | 4,906 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember
Gross unrealized gain | 84 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember | 263 us-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 | 3,884 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember | 5,164 us-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 | 134 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember | 94 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember
Gross unrealized gain | 5 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember | 19 us-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 | $ 138 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember | $ 113 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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