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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Current assets    
Cash and cash equivalents $ 8,310 $ 5,189
Grant receivables 847 564
Prepaid expenses 571 544
Other receivables 300 588
Other current assets 10 23
Total current assets 10,038 6,908
Deferred offering costs 3,210  
Property and equipment, net 141 211
Total assets 13,389 7,119
Current liabilities    
Accounts payable 2,775 2,003
Accrued expenses 740 994
Other current liabilities 913 253
Total current liabilities 4,428 3,250
Simple Agreements for Future Equity 10,918  
Paycheck protection program loan   443
Derivative liability   2,209
Convertible notes, net   12,409
Accrued interest   1,622
Total liabilities 15,346 19,933
Commitments and contingencies
Convertible preferred stock:    
Convertible preferred stock: 84,761 55,370
Stockholders' deficit:    
Common stock, $0.001 par value, 70,000,000 and 58,000,000 shares authorized at September 30, 2021 and December 31, 2020, respectively; 615,907 and 538,793 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively 1 1
Additional paid-in capital 142 222
Accumulated deficit (86,665) (68,220)
Accumulated other comprehensive loss (196) (187)
Total stockholders' deficit (86,718) (68,184)
Total liabilities, convertible preferred stock, and stockholders' deficit 13,389 7,119
Series A convertible preferred stock    
Convertible preferred stock:    
Convertible preferred stock: 4,616 4,616
Series A-1 convertible preferred stock    
Convertible preferred stock:    
Convertible preferred stock: 5,398 5,398
Series A-2 convertible preferred stock    
Convertible preferred stock:    
Convertible preferred stock: 5,809 5,809
Series B convertible preferred stock    
Convertible preferred stock:    
Convertible preferred stock: 39,547 $ 39,547
Series B-1 convertible preferred stock    
Convertible preferred stock:    
Convertible preferred stock: $ 29,391