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Supplemental Balance Sheet Information
 9 Months Ended
Sep. 30, 2020
Supplemental Balance Sheet Information [Abstract]  
Supplemental Balance Sheet Information Supplemental Balance Sheet Information
Prepaid expenses and other current assets
September 30,
2020		December 31,
2019
Prepaid clinical, contract research and manufacturing costs$1,240 $481 
Interest receivable383 236 
Prepaid insurance58 533 
Other1,003 705 
     Prepaid expenses and other current assets$2,684 $1,955 
Property and equipment, net
September 30,
2020		December 31,
2019
Scientific equipment$3,048 $2,795 
Leasehold improvements192 192 
Computers and software53 32 
Furniture and fixtures41 41 
Construction in process2,424 356 
Property and equipment, gross5,758 3,416 
Less: accumulated depreciation(1,489)(1,317)
Property and equipment, net$4,269 $2,099 
Depreciation and amortization expense was $159 and $91 for the three months ended September 30, 2020 and 2019, respectively, and $494 and $265 for the nine months ended September 30, 2020 and 2019, respectively.
Other noncurrent assets
September 30,
2020		December 31,
2019
Restricted cash$1,200 $— 
Prepaid services214 — 
Other— 32 
     Total other noncurrent assets$1,414 $32 
Accrued expenses and other current liabilities
September 30,
2020		December 31,
2019
Accrued payroll-related expenses$921 $920 
Accrued legal expenses245 254 
Accrued clinical, contract research and manufacturing costs554 515 
Common stock warrant liability, current71 — 
Lease liability, current177 292 
Accrued other expenses156 454 
     Accrued expenses and other current liabilities$2,124 $2,435 
Other noncurrent liabilities
September 30,
2020		December 31,
2019
Accrued loan fee payable$656 $— 
     Total other noncurrent liabilities$656 $—