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Supplemental Balance Sheet Information
 6 Months Ended
Jun. 30, 2023
Supplemental Balance Sheet Information [Abstract]  
Supplemental Balance Sheet Information Supplemental Balance Sheet Information
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 
Other noncurrent assets
June 30, 2023 (Restated)December 31, 2022
Restricted cash$1,200 $1,200 
Prepaid insurance1,999 2,252 
Other3 38 
     Other noncurrent assets$3,202 $3,490 
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 
Depreciation and amortization expense was $479 and $593 for the six months ended June 30, 2023 and 2022, respectively. During the six months ended June 30, 2023, the Company sold scientific equipment with a net book value of $255 and recognized a loss of $44 included in other income (expense) in the accompanying statement of operations for the six months ended June 30, 2023.
Accrued expenses and other current liabilities
June 30, 2023December 31, 2022
Accrued clinical, contract research and manufacturing costs$— $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