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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Income Statement [Abstract]    
Revenue $ 8,879,000  
Operating expenses:    
Research and development 9,272,000 $ 10,763,000
Acquired in-process research and development   23,049,000
General and administrative 3,715,000 3,517,000
Total operating expenses 12,987,000 37,329,000
Loss from operations (4,108,000) (37,329,000)
Other income (expense), net:    
Interest expense (232,000) (255,000)
Interest income 639,000 25,000
Other (expense) income, net (179,000) 142,000
Total other income (expense), net 228,000 (88,000)
Loss before income taxes (3,880,000) (37,417,000)
Income tax expense 60,000 0
Net loss (3,940,000) (37,417,000)
Other comprehensive income (loss), net:    
Unrealized gain (loss) on available-for-sale securities, net 96,000 (180,000)
Foreign currency translation gain (loss) 133,000 (136,000)
Total other comprehensive income (loss), net 229,000 (316,000)
Comprehensive loss $ (3,711,000) $ (37,733,000)
Net loss per share, basic $ (0.11) $ (1.17)
Net loss per share, diluted $ (0.11) $ (1.17)
Weighted-average number of common shares outstanding, basic 34,414,149 31,865,783
Weighted-average number of common shares outstanding, diluted 34,414,149 31,865,783