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9. Level 3 fair value inputs (Details) (Level 3 [Member], USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2013
Warrants [Member] |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Beginning Balance | $ 4,892
Issuance of warrants | 2,657
Issuance of notes and warrants | 1,572
Issuance of notes | 0
Conversion of notes | 0
Exercises of warrants | (260)
Adjustments to fair value for the period | (3,370)
Ending Balance | 5,491
Warrants [Member] | Issuance In January [Member] |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Issuance of warrants | 2,657
Warrants [Member] | Issuance In March [Member] |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Issuance of notes and warrants | 1,572
Warrants [Member] | Issuance In June [Member] |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Issuance of notes | 0
Conversion Features [Member] |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Beginning Balance | 0
Issuance of warrants | 0
Issuance of notes and warrants | 1,401
Issuance of notes | 2,929
Conversion of notes | 4,269
Exercises of warrants | 0
Adjustments to fair value for the period | 1,078
Ending Balance | 1,139
Conversion Features [Member] | Issuance In January [Member] |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Issuance of warrants | 0
Conversion Features [Member] | Issuance In March [Member] |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Issuance of notes and warrants | 1,401
Conversion Features [Member] | Issuance In June [Member] |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Issuance of notes | $ 2,929

X
- Definition Conversion of notes + References No definition available. + Details
Name: | peix_FairValueConversionOfNotes
Namespace Prefix: | peix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Exercises of warrants + References No definition available. + Details
Name: | peix_FairValueExercisesOfWarrants
Namespace Prefix: | peix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair Value Issuance Of Notes. + References No definition available. + Details
Name: | peix_FairValueIssuanceOfNotes
Namespace Prefix: | peix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Issuance of notes and warrants + References No definition available. + Details
Name: | peix_FairValueIssuanceOfNotesAndWarrants
Namespace Prefix: | peix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Issuance of warrants + References No definition available. + Details
Name: | peix_FairValueIssuanceOfWarrants
Namespace Prefix: | peix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant