CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CONSOLIDATED STATEMENTS OF OPERATIONS
Deductible grants	$ 75	$ 77	$ 2,204

Grants and reimbursements received or receivable from governmental institutions and collaboration partners for research and development expenses incurred.

No definition available.

Name:	plx_GrantsAndReimbursementsReceivedOrReceivable
Namespace Prefix:	plx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration