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LOSS PER ORDINARY SHARE - Basic (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basic      
Loss (U.S. dollars in thousands) $ 76,173 $ 42,304 $ 38,820
Weighted average number of ordinary shares outstanding during the period (in thousands) 364,276 296,922 231,204
Basic loss per share (U.S. dollars) $ 0.21 $ 0.14 $ 0.17