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Supplemental Balance Sheet Information (Tables)
6 Months Ended
Jun. 30, 2023
Supplemental Balance Sheet Information [Abstract]  
Schedule of Prepaid and Other Current Assets
Prepaid expenses and other current assets
June 30, 2023December 31, 2022
Prepaid clinical, contract research and manufacturing costs$— $213 
Prepaid insurance628 408 
Other701 853 
     Prepaid expenses and other current assets$1,329 $1,474 
Schedule of Other Noncurrent Assets
Other noncurrent assets
June 30, 2023 (Restated)December 31, 2022
Restricted cash$1,200 $1,200 
Prepaid insurance1,999 2,252 
Other38 
     Other noncurrent assets$3,202 $3,490 
Schedule of Property and Equipment, Net
Property and equipment, net
June 30, 2023December 31, 2022
Scientific equipment$5,265 $6,087 
Computers and software63 63 
Furniture and fixtures30 30 
Property and equipment, gross5,358 6,180 
Less: accumulated depreciation and amortization(3,562)(3,650)
Property and equipment, net$1,796 $2,530 
Schedule of Accrued Liabilities
Accrued expenses and other current liabilities
June 30, 2023December 31, 2022
Accrued clinical, contract research and manufacturing costs$— $48 
Accrued restructuring costs— 48 
Lease liability580 539 
Accrued payroll-related expenses16 32 
Accrued federal and state tax payable— 209 
Accrued other expenses492 402 
     Accrued expenses and other current liabilities$1,088 $1,278