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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2020 | Sep. 14, 2020 | Mar. 18, 2020 | Dec. 19, 2019 | Oct. 31, 2020 | Jul. 23, 2018 | Oct. 19, 2017 | Oct. 31, 2015 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  | 26,905,842 | 7,854,729 | 21,405,733 | 7,826,946
Net proceeds from private placement |  |  | $ 41.3 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total proceeds from accounts receivable outstanding |  |  |  |  | $ 2.7 |  |  |  |  |  |  |
Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  | $ 0.001 |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  | 200,000 | 17,604,423 |  |  |  |  |  |  |  |  |
Purchase price (in dollars per share) |  |  | $ 2.485 |  |  |  |  |  |  |  |  |
Number of warrants issued (in shares) |  |  | 17,604,423 |  |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) |  |  | $ 2.36 |  |  |  |  |  |  |  |  |
Exercise of warrants, commencement period |  |  | 6 months |  |  |  |  |  |  |  |  |
Term of warrants |  |  | 5 years |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  |  |  | one-for-ten |  |  |  |  |  |  |  |
2021 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Convertible Notes Payable, Noncurrent |  |  |  |  |  |  |  |  | $ 57.9 |  | $ 57.9 |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 7.50% |  | 7.50% |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  | 7.50% |  | 7.50% |
Seven Point Five Percentage Convertible Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 7.50% |  | 7.50% |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  | 7.50% |  | 7.50% |
Amended Pfizer Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total proceeds from accounts receivable outstanding |  |  |  |  | 1.8 |  |  |  |  |  |  |
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% |  |  |  |
ATM Equity Offering Sales Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 30,000,000 |  |  |  |  |  |  |  |  |  |  |
ATM Equity Offering Sales Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, maximum offering price | $ 30.0 |  |  |  |  |  |  |  |  |  |  |
Chiesi Agreements [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total proceeds from accounts receivable outstanding |  |  |  |  | $ 0.9 |  |  |  |  |  |  |
Chiesi US Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Upfront Nonrefundable Non-Creditable 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 Amount Payable For Achievement Of Regulatory And Commercial Milestones |  |  |  |  |  | $ 760.0 |  |  |  |  |  |
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 Non-Creditable 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 Amount Payable 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% |  |  |  |  |

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