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Interim Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Interim Condensed Consolidated Balance Sheets [Abstract] |  |
Short-term investments, held in guarantee | $ 339,299 | $ 284,317
Redeemable convertible preferred stock, Par Value | $ 0.001 | $ 0.001
Redeemable convertible preferred stock, Shares Authorized | 40,000,000 | 40,000,000
Redeemable convertible preferred stock, Shares Issued | 100,000 |
Redeemable convertible preferred stock, Shares Outstanding | 100,000 |
Common stock, par value | $ 0.001 | $ 0.001
Common stock, shares authorized | 110,000,000 | 110,000,000
Common stock, shares issued | 49,318,543 | 45,202,859
Common stock, shares outstanding | 49,318,543 | 45,202,859

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