CONVERTIBLE NOTES (Fair Value Income Approach) (Details) - 2021 Notes [Member] - Fair Value, Inputs, Level 3 [Member]	12 Months Ended
Dec. 31, 2019
Expected term	1 year 10 months 17 days
Risk free rate	1.57%
Volatility	90.74%
Yield	11.02%

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	plx_FairValueAssumptionsTerm
Namespace Prefix:	plx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration