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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
 9 Months Ended
Mar. 31, 2015
Number  
Options and warrants outstanding at beginning of period 252,000psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsNumber
Options granted 1,000psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsGranted
Options and warrants outstanding at end of the period 253,000psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsNumber
Options and warrants exercisable at the end of the period 252,000psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsNumberExercisable
Options and warrants vested and expected to vest 253,000psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsNumberVestedAndExpectedToVest
Weighted average exercise price  
Options and warrants outstanding at beginning of period $ 5.19psti_WarrantsAndOptionsWeightedAverageExercisePrice
Options granted $ 0.00001psti_WarrantsAndOptionsGrantedWeightedAverageExercisePrice
Options and warrants outstanding at end of the period $ 5.17psti_WarrantsAndOptionsWeightedAverageExercisePrice
Options and warrants exercisable at the end of the period $ 5.19psti_WarrantsAndOptionsWeightedAverageExercisePriceExcercisable
Options and warrants vested and expected to vest $ 5.17psti_WarrantsAndOptionsWeightedAverageExercisePriceVestedAndExpectedToVest
Weighted average remaining contractual term  
Options and warrants outstanding at end of the period 3 years 2 months 23 days
Options and warrants exercisable at the end of the period 3 years 2 months 16 days
Options and warrants vested and expected to vest 3 years 2 months 23 days
Aggregate intrinsic value price  
Options and warrants outstanding at end of the period $ 297psti_WarrantsAndOptionsAggregateIntrinsicValue
Options and warrants exercisable at the end of the period 294psti_WarrantsAndOptionsAggregateIntrinsicValueExercisable
Options and warrants vested and expected to vest $ 297psti_WarrantsAndOptionsAggregateIntrinsicValueVestedAndExpectedToVest