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Supplemental Balance Sheet Information
 6 Months Ended
Jun. 30, 2021
Supplemental Balance Sheet Information [Abstract]  
Supplemental Balance Sheet Information Supplemental Balance Sheet Information
Prepaid expenses and other current assets
June 30, 2021December 31, 2020
Prepaid clinical, contract research and manufacturing costs$3,388 $2,336 
Interest receivable44 161 
Prepaid insurance254 694 
Other902 1,040 
     Prepaid expenses and other current assets$4,588 $4,231 
Property and equipment, net
June 30, 2021December 31, 2020
Scientific equipment$5,966 $5,476 
Leasehold improvements— 192 
Computers and software52 46 
Furniture and fixtures30 30 
Construction in process144 119 
Property and equipment, gross6,192 5,863 
Less: accumulated depreciation(2,090)(1,740)
Property and equipment, net$4,102 $4,123 
Depreciation and amortization expense was $283 and $187 for the three months ended June 30, 2021 and 2020, respectively, and $546 and $335 for the six months ended June 30, 2021 and 2020, respectively.
Accrued expenses and other current liabilities
June 30, 2021December 31, 2020
Accrued clinical, contract research and manufacturing costs$1,223 $1,372 
Accrued payroll-related expenses1,127 1,158 
Lease liability, current420 223 
Accrued other expenses458 772 
     Accrued expenses and other current liabilities$3,228 $3,525