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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 23, 2018 | Oct. 19, 2017 | Oct. 31, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  |  | $ 0.001 | $ 0.001 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  | 74,583,792 | 76,848,199 | 23,532,492 |
Tax Rate Assumption Related To Deferred Tax Difference Reversal |  |  |  | The Company used tax rates of 27%, 23% and 21%. |  |  |
Net Loss Per Share |  |  |  | $ (0.18) | $ (0.64) | $ (0.29) |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Finance Lease, Right-of-Use Asset |  |  |  |  |  |  | $ 5.9
Finance Lease, Liability |  |  |  |  |  |  | $ 5.9
Revision Adjustment [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Contract With Customer Liability And Accumulated Losses |  |  |  |  | $ 1.8 |  |
Net Loss Per Share |  |  |  |  | $ 0.01 |  |
Seven Point Five Percentage Convertible Notes 2021 [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Debt Instrument Carrying Amount |  |  |  | $ 57.9 |  |  |
Brazil [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage Of Adult Gaucher Patients Treated With alfataliglicerase |  |  |  | 10.00% |  |  |
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 US Agreement [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Upfront Nonrefundable Noncreditable Payment Receivable | $ 25.0 | $ 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 |  |  |  |  |  |
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Modification of Contract |  |  |  | $ 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% |  |  |  |  |
Brazil Agreement [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Supply Commitment In Year 2017 |  |  |  |  | $ 24.3 |  |
Fiocruz [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenues |  |  |  | $ 3.7 | $ 7.1 |  |

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