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Condensed Consolidated Statements of Changes In Shareholders' Equity - USD ($)
$ in Thousands
Total
Ordinary Shares [Member]
Additional Paid-In-Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2021 $ 189,967 $ 27 $ 404,362 $ (790) $ (213,632)
Beginning balance (in shares) at Dec. 31, 2021   270,120,548      
Share-based compensation 3,529   3,529    
Issuance of ordinary shares for cash 102   102    
Issuance of ordinary shares for cash (in shares)   207,935      
Change in unrealized loss on marketable debt securities available-for-sale (217)     (217)  
Net loss (51,489)       (51,489)
Ending balance at Jun. 30, 2022 141,892 $ 27 407,993 (1,007) (265,121)
Ending balance (in shares) at Jun. 30, 2022   270,328,483      
Beginning balance at Mar. 31, 2022 168,977 $ 27 406,019 (790) (236,279)
Beginning balance (in shares) at Mar. 31, 2022   270,126,946      
Share-based compensation 1,879   1,879    
Issuance of ordinary shares for cash 95   95    
Issuance of ordinary shares for cash (in shares)   201,537      
Change in unrealized loss on marketable debt securities available-for-sale (217)     (217)  
Net loss (28,842)       (28,842)
Ending balance at Jun. 30, 2022 141,892 $ 27 407,993 (1,007) (265,121)
Ending balance (in shares) at Jun. 30, 2022   270,328,483      
Beginning balance at Dec. 31, 2022 117,850 $ 27 410,753 (1,302) (291,628)
Beginning balance (in shares) at Dec. 31, 2022   270,455,232      
Share-based compensation 4,033   4,033    
Issuance of ordinary shares for cash through registered direct offering with a related party, net of issuance costs 74,663 $ 3 74,660    
Issuance of ordinary shares for cash through registered direct offering with a related party, net of issuance costs (in shares)   37,688,441      
Issuance of ordinary shares for cash through at the market offering, net of issuance costs 77,780 $ 12 77,768    
Issuance of ordinary shares for cash through at the market offering, net of issuance costs (in shares)   116,030,782      
Issuance of ordinary shares upon option exercises for cash $ 8,042 $ 1 8,041    
Issuance of ordinary shares upon option exercises for cash (in shares) 7,558,033 7,558,033      
Issuance of ordinary shares for services $ 791   791    
Issuance of ordinary shares for services (in shares)   495,000      
Change in unrealized loss on marketable debt securities available-for-sale 349     349  
Net loss (33,128)       (33,128)
Ending balance at Jun. 30, 2023 250,380 $ 43 576,046 (953) (324,756)
Ending balance (in shares) at Jun. 30, 2023   432,227,488      
Beginning balance at Mar. 31, 2023 182,592 $ 39 490,459 (976) (306,930)
Beginning balance (in shares) at Mar. 31, 2023   386,486,014      
Share-based compensation 2,095   2,095    
Issuance of ordinary shares for cash through registered direct offering with a related party, net of issuance costs 74,663 $ 3 74,660    
Issuance of ordinary shares for cash through registered direct offering with a related party, net of issuance costs (in shares)   37,688,441      
Issuance of ordinary shares upon option exercises for cash 8,042 $ 1 8,041    
Issuance of ordinary shares upon option exercises for cash (in shares)   7,558,033      
Issuance of ordinary shares for services 791   791    
Issuance of ordinary shares for services (in shares)   495,000      
Change in unrealized loss on marketable debt securities available-for-sale 23     23  
Net loss (17,826)       (17,826)
Ending balance at Jun. 30, 2023 $ 250,380 $ 43 $ 576,046 $ (953) $ (324,756)
Ending balance (in shares) at Jun. 30, 2023   432,227,488