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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended			6 Months Ended
	Oct. 19, 2017	Oct. 31, 2015	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Significant Accounting Policies [Line Items]
Common Stock, Par or Stated Value Per Share			$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			72,836,697		5,059,186	73,306,448	74,087,411
Maximum [Member]
Significant Accounting Policies [Line Items]
Additional AmountPayable For Achievement Of Regulatory And Commercial Milestones	$ 320.0
Brazil [Member]
Significant Accounting Policies [Line Items]
Percentage Of Adult Gaucher Patients Treated With alfataliglicerase						10.00%
Brazil Agreement [Member]
Significant Accounting Policies [Line Items]
Supply Commitment In Year 2017				$ 24.3
Pfizer Agreement [Member]
Significant Accounting Policies [Line Items]
Proceeds From Exchange For Rights To Royalties		$ 36.0
Amended Pfizer Agreement [Member] | Protalix Bio Therapeutics Incorporation [Member] | Brazil [Member]
Significant Accounting Policies [Line Items]
Collaborative Arrangement Revenues and Expenses Sharing Percentage		100.00%
Chiesi Agreement [Member]
Significant Accounting Policies [Line Items]
Upfront Nonrefundable Noncreditable Payment Receivable	25.0
Additional Amounts Payable To Cover Development Costs	25.0
Maximum Entitlement Of Development Costs To Cover Per Year	$ 10.0
Revenues				$ 1.8
Chiesi Agreement [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Payment On Net Sales Percentage	15.00%
Chiesi Agreement [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Payment On Net Sales Percentage	35.00%
Fiocruz [Member]
Significant Accounting Policies [Line Items]
Revenues						$ 2.6	$ 7.1

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