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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Revenue        
Revenues $ 4,651 $ 14,241 $ 11,338 $ 26,822
Operating expenses        
Research and development 17,692 22,942 35,967 41,404
General and administrative 5,980 5,200 11,532 10,092
Change in fair value of contingent consideration (636) 208 (363) 409
Total operating expenses 23,036 28,350 47,136 51,905
Loss from operations (18,385) (14,109) (35,798) (25,083)
Interest income 1,461 396 2,729 555
Interest expense (171) (482) (369) (988)
Foreign exchange (gain) loss 1 3 5 3
Total other income (loss) 1,291 (83) 2,365 (430)
Loss before income taxes (17,094) (14,192) (33,433) (25,513)
Income tax expense 0 0 0 (4,444)
Net loss $ (17,094) $ (14,192) $ (33,433) $ (29,957)
Loss per share        
Basic (in USD per share) $ (0.10) $ (0.10) $ (0.20)  
Diluted (in USD per share) $ (0.10) $ (0.10) $ (0.20) $ (0.20)
Weighted average number of common shares        
Basic (in shares) 166,063,284 148,750,048 163,855,661  
Diluted (in shares) 166,063,284 148,750,048 163,855,661 148,589,711
Comprehensive loss        
Unrealized gain (loss) on available-for-sale securities $ 166 $ (691) $ 1,020 $ (1,762)
Comprehensive loss (16,928) (14,883) (32,413) (31,719)
Collaborations and licenses        
Revenue        
Revenues 3,885 12,556 9,394 23,774
Non-cash royalty revenue        
Revenue        
Revenues $ 766 $ 1,685 $ 1,944 $ 3,048