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COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Dec. 31, 2014
Other Commitments [Line Items]
Decrease in cash pledged	$ (4,251)us-gaap_IncreaseDecreaseInRestrictedCash
Grants received	18,111psti_AggregateGrantsReceived
Royalty payable based on grants received	100.00%psti_RoyaltyRatePayableOnGrantsReceived
Accrued and paid royalties	60psti_RoyaltiesAmountPaidAndAccrued
Contingent liability amount	$ 18,051us-gaap_RoyaltyGuaranteesCommitmentsAmount
Minimum [Member]
Other Commitments [Line Items]
Royalty rate	3.00%psti_RoyaltyRateSales / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member]
Other Commitments [Line Items]
Royalty rate	4.00%psti_RoyaltyRateSales / us-gaap_RangeAxis = us-gaap_MaximumMember

X

- Definition

Aggregate revenue received from grants as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Amount of royalty paid or accrued.

+ References

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- Definition

Maximum royalty payable based on a percentage of grants received.

+ References

No definition available.

+ Details

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- Definition

Royalty rate payable calculated as a percentage of the sale of products and other related revenues generated from such projects.

+ References

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+ Details

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- Definition

The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The amount the entity has committed to make for future royalty guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 928

-SubTopic 440

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6473578&loc=d3e63223-108013

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