Quarterly report pursuant to Section 13 or 15(d)

Property and equipment, net - Summary of property and equipment net (Detail)

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Property and equipment, net - Summary of property and equipment net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross $ 1,404 $ 1,405
Accumulated depreciation and amortization (1,336) (1,318)
Total property and equipment, net 68 87
Software [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross 6 6
Lab equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross 1,343 1,343
Computer hardware [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross 31 32
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross $ 24 $ 24