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STOCKHOLDERS' EQUITY (Summary of Option and Warrant Activity to Non-employees) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 6 Months Ended
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Dec. 31, 2014
Number |
Options and warrants outstanding at beginning of period | 252,000 psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsNumber
Options and warrants outstanding at end of the period | 252,000 psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsNumber
Options and warrants exercisable at the end of the period | 252,000 psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsNumberExercisable
Options and warrants vested and expected to vest | 252,000 psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsNumberVestedAndExpectedToVest
Weighted average exercise price |
Options and warrants outstanding at beginning of period | $ 5.19 psti_WarrantsAndOptionsWeightedAverageExercisePrice
Options and warrants outstanding at end of the period | $ 5.19 psti_WarrantsAndOptionsWeightedAverageExercisePrice
Options and warrants exercisable at the end of the period | $ 5.19 psti_WarrantsAndOptionsWeightedAverageExercisePriceExcercisable
Options and warrants vested and expected to vest | $ 5.19 psti_WarrantsAndOptionsWeightedAverageExercisePriceVestedAndExpectedToVest
Weighted average remaining contractual term |
Options and warrants outstanding at end of the period | 3 years 5 months 12 days
Options and warrants exercisable at the end of the period | 3 years 5 months 12 days
Options and warrants vested and expected to vest | 3 years 5 months 12 days
Aggregate intrinsic value price |
Options and warrants outstanding at end of the period | $ 262 psti_WarrantsAndOptionsAggregateIntrinsicValue
Options and warrants exercisable at the end of the period | 262 psti_WarrantsAndOptionsAggregateIntrinsicValueExercisable
Options and warrants vested and expected to vest | $ 262 psti_WarrantsAndOptionsAggregateIntrinsicValueVestedAndExpectedToVest

X
- Definition Sharebased goods and nonemployees services transaction warrants and options number. + References No definition available. + Details
Name: | psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsNumber
Namespace Prefix: | psti_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Sharebased goods and nonemployees services transaction warrants and options number exercisable. + References No definition available. + Details
Name: | psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsNumberExercisable
Namespace Prefix: | psti_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Sharebased goods and nonemployees services transaction warrants and options number vested and expected to vest. + References No definition available. + Details
Name: | psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsNumberVestedAndExpectedToVest
Namespace Prefix: | psti_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Warrants and options aggregate intrinsic value. + References No definition available. + Details
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Namespace Prefix: | psti_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Warrants and options aggregate intrinsic value exercisable. + References No definition available. + Details
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Namespace Prefix: | psti_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
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Namespace Prefix: | psti_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Warrants and options aggregate intrinsic value vested and expected to vest. + References No definition available. + Details
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Namespace Prefix: | psti_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | psti_WarrantsAndOptionsNumberAbstract
Namespace Prefix: | psti_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Warrants and options weighted average exercise price. + References No definition available. + Details
Name: | psti_WarrantsAndOptionsWeightedAverageExercisePrice
Namespace Prefix: | psti_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
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Namespace Prefix: | psti_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Warrants and options weighted average exercise price excercisable. + References No definition available. + Details
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Namespace Prefix: | psti_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Warrants and options weighted average exercise price vested and expected to vest. + References No definition available. + Details
Name: | psti_WarrantsAndOptionsWeightedAverageExercisePriceVestedAndExpectedToVest
Namespace Prefix: | psti_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Warrants and pptions weighted average remaining contractual term. + References No definition available. + Details
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Namespace Prefix: | psti_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Warrants and options weighted average remaining contractual term exercisable. + References No definition available. + Details
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Namespace Prefix: | psti_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Warrants and options weighted average remaining contractual term vested and expected to vest. + References No definition available. + Details
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Namespace Prefix: | psti_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration