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Supplemental Balance Sheet Information
 9 Months Ended
Sep. 30, 2021
Supplemental Balance Sheet Information [Abstract]  
Supplemental Balance Sheet Information Supplemental Balance Sheet Information
Prepaid expenses and other current assets
September 30, 2021December 31, 2020
Prepaid clinical, contract research and manufacturing costs$2,133 $2,336 
Interest receivable27 161 
Prepaid insurance40 694 
Other1,109 1,040 
     Prepaid expenses and other current assets$3,309 $4,231 

Property and equipment, net
September 30, 2021December 31, 2020
Scientific equipment$6,136 $5,476 
Leasehold improvements— 192 
Computers and software60 46 
Furniture and fixtures30 30 
Construction in process318 119 
Property and equipment, gross6,544 5,863 
Less: accumulated depreciation(2,373)(1,740)
Property and equipment, net$4,171 $4,123 
Depreciation and amortization expense was $283 and $159 for the three months ended September 30, 2021 and 2020, respectively, and $829 and $494 for the nine months ended September 30, 2021 and 2020, respectively.
Accrued expenses and other current liabilities
September 30, 2021December 31, 2020
Accrued clinical, contract research and manufacturing costs$2,741 $1,372 
Accrued payroll-related expenses1,388 1,158 
Lease liability, current440 223 
Accrued other expenses911 772 
     Accrued expenses and other current liabilities$5,480 $3,525