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Restatement of Prior Period Financial Statements - Summary of Restated Consolidated Statements of Operations and Comprehensive 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                
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
Other expense, net (126)     35     (131) (204)
Gain on extinguishment of liabilities 0     0     764 0
Unrealized loss on investment             0 (1)
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)
Deemed dividends             0 (619)
Net loss attributable to common shareholders             $ (37,917) $ (22,370)
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 Reported                
Operating expenses                
Research and development   $ 5,980 $ 5,072   $ 8,657 $ 14,637    
General and administrative   4,208 3,538   5,744 9,952    
Total operating expenses   10,188 8,610   14,401 24,589    
Loss from operations   (10,188) (8,610)   (14,401) (24,589)    
Other income (loss):                
Foreign currency transaction gain (loss)   11 (294)   (201) (190)    
Interest income (expense), net   823 823   1,427 2,250    
Other expense, net   0 (40)   (5) (5)    
Gain on extinguishment of liabilities   0 764   764 764    
Unrealized loss on investment     0   0 0    
Total other income (loss), net   834 1,253   1,985 2,819    
Net loss   (9,354) (7,357) $ (5,059) (12,416) (21,770)    
Other comprehensive income:                
Unrealized foreign currency translation gain (loss)   (28) 305 (101) 204 176    
Total other comprehensive income (loss)   (28) 305   204 176    
Total comprehensive loss   (9,382) (7,052)   (12,212) (21,594)    
Net loss   (9,354) (7,357) $ (5,059) (12,416) (21,770)    
Deemed dividends     0   0      
Net loss attributable to common shareholders   $ (9,354) $ (7,357)   $ (12,416) $ (21,770)    
Net loss per share: basic   $ (0.24) $ (0.2)   $ (0.38) $ (0.63)    
Net loss per share: diluted   $ (0.24) $ (0.2)   $ (0.38) $ (0.63)    
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    
Adjustment                
Operating expenses                
Research and development   $ 515 $ 313   $ 313 $ 828    
General and administrative   4,632 1,882   1,882 6,514    
Total operating expenses   5,147 2,195   2,195 7,342    
Loss from operations   (5,147) (2,195)   (2,195) (7,342)    
Other income (loss):                
Foreign currency transaction gain (loss)   0 0   0 0    
Interest income (expense), net   0 0   0 0    
Other expense, net   0 0   0 0    
Gain on extinguishment of liabilities   0 0   0 0    
Unrealized loss on investment     0   0 0    
Total other income (loss), net   0 0   0 0    
Net loss   (5,147) (2,195)   (2,195) (7,342)    
Other comprehensive income:                
Unrealized foreign currency translation gain (loss)   0 0   0 0    
Total other comprehensive income (loss)   0 0   0 0    
Total comprehensive loss   (5,147) (2,195)   (2,195) (7,342)    
Net loss   (5,147) (2,195)   (2,195) (7,342)    
Deemed dividends     0   0      
Net loss attributable to common shareholders   $ (5,147) $ (2,195)   $ (2,195) $ (7,342)    
Net loss per share: basic   $ (0.13) $ (0.06)   $ (0.07) $ (0.21)    
Net loss per share: diluted   $ (0.13) $ (0.06)   $ (0.07) $ (0.21)    
Weighted average number of shares outstanding: basic   0 0   0 0    
Weighted average number of shares outstanding: diluted   0 0   0 0    
As Restated                
Operating expenses                
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    
Other expense, net   0 (40)   (5) (5)    
Gain on extinguishment of liabilities   0 764   764 764    
Unrealized loss on investment     0   0 0    
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)    
Deemed dividends     0   0      
Net loss attributable to common shareholders   $ (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