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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 19, 2017
Oct. 31, 2015
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Jul. 23, 2018
Significant Accounting Policies [Line Items]                  
Common Stock, Par or Stated Value Per Share     $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     73,280,977   80,696,070 73,310,911 76,195,921    
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       $ 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%              
Fiocruz [Member]                  
Significant Accounting Policies [Line Items]                  
Revenues           $ 2.6   $ 7.1  
Chiesi US Agreement [Member]                  
Significant Accounting Policies [Line Items]                  
Upfront Nonrefundable Noncreditable Payment Receivable $ 25.0                
Additional Amounts Payable To Cover Development Costs                 $ 20.0
Maximum Entitlement Of Development Costs To Cover Per Year                 7.5
Additional AmountPayable For Achievement Of Regulatory And Commercial Milestones                 $ 760.0
Revenues       $ 1.8   $ 6.2      
Chiesi US Agreement [Member] | Minimum [Member]                  
Significant Accounting Policies [Line Items]                  
Payment On Net Sales Percentage 15.00%                
Chiesi US Agreement [Member] | Maximum [Member]                  
Significant Accounting Policies [Line Items]                  
Payment On Net Sales Percentage 40.00%                
Chiesi Ex US 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                
Additional AmountPayable For Achievement Of Regulatory And Commercial Milestones $ 320.0                
Chiesi Ex US Agreement [Member] | Minimum [Member]                  
Significant Accounting Policies [Line Items]                  
Payment On Net Sales Percentage 15.00%                
Chiesi Ex US Agreement [Member] | Maximum [Member]                  
Significant Accounting Policies [Line Items]                  
Payment On Net Sales Percentage 35.00%