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Supplemental Balance Sheet Information
 6 Months Ended
Jun. 30, 2024
Supplemental Balance Sheet Information [Abstract]  
Supplemental Balance Sheet Information Supplemental Balance Sheet Information
Prepaid expenses and other current assets
June 30, 2024December 31, 2023
Prepaid insurance$476 $508 
Prepaid franchise tax61 259 
Lease costs255 235 
Prepaid professional fees70 95 
Prepaid software 62 72 
Other68 24 
     Prepaid expenses and other current assets$992 $1,193 
Other noncurrent assets
June 30, 2024December 31, 2023
Restricted cash$872 $1,200 
Prepaid insurance1,571 1,785 
     Other noncurrent assets$2,443 $2,985 
Property and equipment, net
June 30, 2024December 31, 2023
Scientific equipment$246 $246 
Computers and software3 3 
Furniture and fixtures30 30 
Property and equipment, gross279 279 
Less: accumulated depreciation and amortization(239)(225)
Property and equipment, net$40 $54 
Depreciation and amortization expense was $14 and $479 for the six months ended June 30, 2024 and 2023, respectively.
Accrued expenses and other current liabilities
June 30, 2024December 31, 2023
Current lease liability$671 $626 
Accrued payroll-related expenses— 71 
Accrued other expenses175 182 
     Accrued expenses and other current liabilities$846 $879