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v3.19.3

SUBSEQUENT EVENTS (Details) - Subsequent Event [Member] - Chiesi [Member] - USD ($) $ in Millions | Oct. 18, 2019 | Oct. 16, 2019
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Subsequent Event [Line Items] |  |
Total proceeds from reimbursement of expenses |  | $ 2.6
Alfataliglicerase to Fiocruz [Member] |  |
Subsequent Event [Line Items] |  |
Total proceeds from sales | $ 3.2 |

X
- Definition The cash inflow from reimbursement of expenses. + References No definition available. + Details
Name: | plx_ProceedsFromReimbursementOfExpenses
Namespace Prefix: | plx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of proceeds from sale of products. + References No definition available. + Details
Name: | plx_ProceedsFromSaleOfProducts
Namespace Prefix: | plx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=plx_ChiesiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=plx_AlfataligliceraseToFiocruzMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |