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Supplemental Balance Sheet Information (Tables)
 6 Months Ended
Jun. 30, 2020
Supplemental Balance Sheet Information [Abstract]  
Prepaid Expense and Other Current Assets
Prepaid expenses and other current assets
June 30,
2020		December 31,
2019
Prepaid clinical, contract research and manufacturing costs$2,203  $481  
Interest receivable221  236  
Prepaid insurance212  533  
Other952  705  
     Prepaid expenses and other current assets$3,588  $1,955  
Property and Equipment, Net
Property and equipment, net
June 30,
2020		December 31,
2019
Scientific equipment$3,315  $2,795  
Leasehold improvements192  192  
Computers and software48  32  
Furniture and fixtures41  41  
Construction in process2,512  356  
Property and equipment, gross6,108  3,416  
Less: accumulated depreciation(1,644) (1,317) 
Property and equipment, net$4,464  $2,099  
Other Noncurrent Assets
Other noncurrent assets
June 30,
2020		December 31,
2019
Restricted cash$1,200  $—  
Prepaid lease costs823  —  
Prepaid services233  —  
Operating lease asset—  356  
Other10  32  
     Total other noncurrent assets$2,266  $388  
Accrued Expenses and Other Current Liabilities
Accrued expenses and other current liabilities
June 30,
2020		December 31,
2019
Accrued payroll-related expenses$706  $920  
Accrued legal expenses362  254  
Accrued clinical, contract research and manufacturing costs303  515  
Common stock warrant liability257  —  
Operating lease liability196  292  
Accrued other expenses123  454  
     Accrued expenses and other current liabilities$1,947  $2,435  
Other Noncurrent Liabilities
Other noncurrent liabilities
June 30,
2020		December 31,
2019
Operating lease liability$—  $59  
     Total other noncurrent liabilities$—  $59