FAIR VALUE MEASUREMENT (The liability component was valued based on the Income Approach) (Details) - Fair Value, Inputs, Level 3 [Member]	3 Months Ended
Mar. 31, 2018 $ / shares
Four Point Five Percentage Convertible Notes [Member]
Stock price (USD)	$ 0.5399
Expected term (years)	5 months 16 days
Risk free rate	1.88%
Volatility	62.44%
Yield	12.89%
Seven Point Five Percentage Convertible Notes [Member]
Stock price (USD)	$ 0.5399
Expected term (years)	3 years 7 months 17 days
Risk free rate	2.45%
Volatility	70.96%
Yield	12.44%

- 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

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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:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=plx_FourPointFivePercentageConvertibleNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type: