v3.26.1
Segment Information - Schedule of Segment Reporting Financial Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2025
Revenue                  
Total revenue $ 14,359     $ 18,314     $ 50,133 $ 50,199  
Operating expenses:                  
Research and development 22,126     27,210     62,428 82,931  
General and administrative 9,469     9,997     28,046 34,231  
Total operating expenses 31,595     37,207     90,474 117,162  
Loss from operations (17,236)     (18,893)     (40,341) (66,963)  
Other income (expense):                  
Interest expense (4,130)     (1,618)     (10,529) (5,294)  
Interest and investment income, net 1,901     2,285     6,407 7,376  
Total other (expense) income, net (2,229)     667     (4,122) 2,082  
Loss before income taxes (19,465)     (18,226)     (44,463) (64,881)  
Income tax (expense) benefit (36)     (29)     (67) 1,692  
Net loss (19,501) $ (13,091) $ (11,938) (18,255) $ (22,644) $ (22,290) (44,530) (63,189) $ (81,889)
Royalty [Member]                  
Revenue                  
Total revenue 14,359     18,314     50,133 50,199  
Virology [Member]                  
Operating expenses:                  
Research and development 5,893     15,412     15,746 51,620  
Virology [Member] | RSV [Member]                  
Operating expenses:                  
Research and development 5,893     15,412     15,746 51,620  
Immunology [Member]                  
Operating expenses:                  
Research and development 14,683     11,027     41,618 29,412  
Immunology [Member] | KIT [Member]                  
Operating expenses:                  
Research and development 4,232     4,057     12,803 11,902  
Immunology [Member] | STAT6 [Member]                  
Operating expenses:                  
Research and development 7,083     4,678     20,578 10,670  
Immunology [Member] | MRGPRX2 [Member]                  
Operating expenses:                  
Research and development 3,368     2,292     8,237 6,840  
Other programs [Member]                  
Operating expenses:                  
Research and development 1,550     771     5,064 1,899  
Other programs [Member] | Early discovery [Member]                  
Operating expenses:                  
Research and development 1,421     603     4,572 1,115  
Other programs [Member] | Other pipeline programs [Member]                  
Operating expenses:                  
Research and development $ 129     $ 168     $ 492 $ 784