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Restatement of Prior Period Financial Statements - Schedule of unaudited condensed consolidated statements of operations and comprehensive income loss (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2024
Mar. 31, 2025
Jun. 30, 2025
Jun. 30, 2024
Operating Expenses [Abstract]                
Royalties and license fees $ 0     $ 0     $ 0 $ (108)
Research and development 2,867     3,585     18,332 15,609
General and administrative 6,967     2,206     23,433 6,989
Total operating expenses 9,834     5,791     41,765 22,490
Loss from operations (9,834)     (5,791)     (41,765) (22,490)
Other income (loss):                
Foreign currency transaction gain (loss) 119     93     (71) 40
Interest income (expense), net 1,036     604     3,286 904
Gain on extinguishment of liabilities 0     0     764 0
Other expense, net (126)     35     (131) (204)
Total other income (loss), net 1,029     732     3,848 739
Net loss (8,805)     (5,059)     (37,917) (21,751)
Other comprehensive income:                
Unrealized foreign currency translation gain (loss) (123)     (101)     53 (62)
Total other comprehensive income (loss) (123)     (101)     53 (62)
Total comprehensive loss (8,928)     (5,160)     (37,864) (21,813)
Net loss $ (8,805)     $ (5,059)     $ (37,917) $ (21,751)
Net loss per share: basic $ (0.21)     $ (0.18)     $ (1.05) $ (1.22)
Net loss per share: diluted $ (0.21)     $ (0.18)     $ (1.05) $ (1.22)
Weighted average number of shares outstanding: basic 41,161,259     27,883,624     36,209,271 18,364,386
Weighted average number of shares outstanding: diluted 41,161,259     27,883,624     36,209,271 18,364,386
As Restated                
Operating Expenses [Abstract]                
Royalties and license fees   $ 0 $ 0          
Research and development   6,495 5,385   $ 8,970 $ 15,465    
General and administrative   8,840 5,420   7,626 16,466    
Total operating expenses   15,335 10,805   16,596 31,931    
Loss from operations   (15,335) (10,805)   (16,596) (31,931)    
Other income (loss):                
Foreign currency transaction gain (loss)   11 (294)   (201) (190)    
Interest income (expense), net   823 823   1,427 2,250    
Gain on extinguishment of liabilities   0 764   764 764    
Other expense, net   0 (40)   (5) (5)    
Total other income (loss), net   834 1,253   1,985 2,819    
Net loss   (14,501) (9,552)   (14,611) (29,112)    
Other comprehensive income:                
Unrealized foreign currency translation gain (loss)   (28) 305   204 176    
Total other comprehensive income (loss)   (28) 305   204 176    
Total comprehensive loss   (14,529) (9,247)   (14,407) (28,936)    
Net loss   $ (14,501) $ (9,552)   $ (14,611) $ (29,112)    
Net loss per share: basic   $ (0.38) $ (0.26)   $ (0.45) $ (0.84)    
Net loss per share: diluted   $ (0.38) $ (0.26)   $ (0.45) $ (0.84)    
Weighted average number of shares outstanding: basic   38,599,453 37,254,839   32,574,158 34,559,870    
Weighted average number of shares outstanding: diluted   38,599,453 37,254,839   32,574,158 34,559,870