CONVERTIBLE NOTES (Fair Value Income Approach) (Details) - Fair Value, Inputs, Level 3 [Member] - $ / shares		1 Months Ended	12 Months Ended
Dec. 07, 2016	Jul. 24, 2017	Dec. 31, 2018
Four Point Five Percentage Convertible Notes 2022 [Member]
Stock price (USD)		$ 0.77
Expected term		4 years 6 months 25 days
Risk free rate		1.78%
Volatility		62.68%
Yield		15.21%
Seven Point Five Percentage Convertible Notes [Member]
Stock price (USD)	$ 0.3	$ 0.77
Expected term	4 years 11 months 8 days	4 years 3 months 25 days	2 years 10 months 17 days
Risk free rate	1.86%	1.74%	2.44%
Volatility	54.12%	63.79%	75.94%
Yield	13.98%	11.56%	13.34%

- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

No definition available.

+ Details

Name:	plx_FairValueAssumptionsExpectedDividendRates
Namespace Prefix:	plx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

No definition available.

+ Details

Name:	plx_FairValueAssumptionsExpectedVolatilityRates
Namespace Prefix:	plx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

No definition available.

+ Details

Name:	plx_FairValueAssumptionsRiskFreeInterestRates
Namespace Prefix:	plx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

No definition available.

+ Details

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

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	plx_StrikePrice
Namespace Prefix:	plx_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=plx_FourPointFivePercentageConvertibleNotesOneMember
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- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
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- Details

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