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STOCKHOLDERS' EQUITY (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 9 Months Ended | 1 Months Ended
--- | --- | --- | ---
Feb. 28, 2015 | Oct. 31, 2014 | Mar. 31, 2015 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |  |  |
Issuance of common stock in a private placement, shares | 200,000 psti_StockIssuedDuringPeriodSharesPrivatePlacement | 200,000 psti_StockIssuedDuringPeriodSharesPrivatePlacement |  |  |
Issuance of common stock in a private placement | $ 586 psti_StockIssuedDuringPeriodValuePrivatePlacement | $ 528 psti_StockIssuedDuringPeriodValuePrivatePlacement | $ 1,114 psti_StockIssuedDuringPeriodValuePrivatePlacement |  |
Stock based compensation to contractor |  |  |  |  |
Common Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Issuance of common stock in a private placement, shares |  |  | 400,000 psti_StockIssuedDuringPeriodSharesPrivatePlacement / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock in a private placement |  |  |  | [1] |
Stock based compensation to contractor, shares |  |  | 100,004 us-gaap_StockIssuedDuringPeriodSharesIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 100,004 us-gaap_StockIssuedDuringPeriodSharesIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock based compensation to contractor |  |  |  | [1] |
Additional Paid-in Capital [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Issuance of common stock in a private placement |  |  | 1,114 psti_StockIssuedDuringPeriodValuePrivatePlacement / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Stock based compensation to contractor |  |  | 280 us-gaap_StockIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Investor Warrants [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Warrants exercised via cashless exercise |  |  | 1,531,367 us-gaap_ConversionOfStockSharesConverted1 / us-gaap_ClassOfWarrantOrRightAxis = psti_InvestorWarrantsMember |  |
Warrants exercised via cashless exercise, shares issued |  |  | 694,326 us-gaap_ConversionOfStockSharesIssued1 / us-gaap_ClassOfWarrantOrRightAxis = psti_InvestorWarrantsMember |  |
Warrants exercised for cash |  |  | 147,667 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_ClassOfWarrantOrRightAxis = psti_InvestorWarrantsMember |  |
Number of warrants exercised |  |  | 147,667 psti_SharebasedCompensationArrangementWarrantsExercised / us-gaap_ClassOfWarrantOrRightAxis = psti_InvestorWarrantsMember |  |
Aggregate cash consideration received |  |  | $ 244 us-gaap_ProceedsFromWarrantExercises / us-gaap_ClassOfWarrantOrRightAxis = psti_InvestorWarrantsMember |  |
[1] | Less than $1

X
- Definition Number of warrants exercised during the period. + References No definition available. + Details
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Namespace Prefix: | psti_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of stock issued during the period under the private placement. + References No definition available. + Details
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- Definition Represents the equity impact of the value of private placement issued during the period. + References No definition available. + Details
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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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Period Type: | duration

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- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References No definition available. + Details
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- Definition Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders. + References No definition available. + Details
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- Definition Number of shares of stock issued during the period that is attributable to transactions involving issuance of stock not separately disclosed. + References No definition available. + Details
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- Definition Value of stock issued in lieu of cash for services contributed to the entity. Value of the stock issued includes, but is not limited to, services contributed by vendors and founders. + References No definition available. + Details
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