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Condensed Statements of Redeemable Convertible Preferred Stock and Stockholders' Deficit (Unaudited) - USD ($)
$ in Thousands
Total
Redeemable Convertible Preferred Stock
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Beginning Balance at Dec. 31, 2019   $ 64,256      
Beginning Balance, shares at Dec. 31, 2019   9,804,640      
Beginning Balance at Dec. 31, 2019 $ (54,683)   $ 9 $ 656 $ (55,348)
Beginning Balance, shares at Dec. 31, 2019     9,319,466    
Issuance of Series E convertible preferred stock   $ 30,055      
Issuance of Series E convertible preferred stock, shares   1,899,847      
Issuance of common stock upon exercise of stock options 1     1  
Issuance of common stock upon exercise of stock options, shares     1,500    
Stock-based compensation expense 61     61  
Net loss (9,175)       (9,175)
Ending Balance at Mar. 31, 2020   $ 94,311      
Ending Balance, shares at Mar. 31, 2020   11,704,487      
Ending Balance at Mar. 31, 2020 (63,796)   $ 9 718 (64,523)
Ending Balance, shares at Mar. 31, 2020     9,320,966    
Beginning Balance at Dec. 31, 2019   $ 64,256      
Beginning Balance, shares at Dec. 31, 2019   9,804,640      
Beginning Balance at Dec. 31, 2019 (54,683)   $ 9 656 (55,348)
Beginning Balance, shares at Dec. 31, 2019     9,319,466    
Net loss (17,491)        
Ending Balance at Jun. 30, 2020 (72,040) $ 94,299 $ 9 790 (72,839)
Ending Balance, shares at Jun. 30, 2020   11,704,487 9,341,486    
Beginning Balance at Mar. 31, 2020   $ 94,311      
Beginning Balance, shares at Mar. 31, 2020   11,704,487      
Beginning Balance at Mar. 31, 2020 (63,796)   $ 9 718 (64,523)
Beginning Balance, shares at Mar. 31, 2020     9,320,966    
Issuance of Series E convertible preferred stock 0 $ 12   0  
Issuance of Series E convertible preferred stock, shares     0    
Issuance of common stock upon exercise of stock options 7     7  
Issuance of common stock upon exercise of stock options, shares     20,520    
Stock-based compensation expense 65     65 0
Net loss (8,316)       (8,316)
Ending Balance at Jun. 30, 2020 (72,040) $ 94,299 $ 9 790 (72,839)
Ending Balance, shares at Jun. 30, 2020   11,704,487 9,341,486    
Beginning Balance at Dec. 31, 2020   $ 117,331      
Beginning Balance, shares at Dec. 31, 2020   12,767,202      
Beginning Balance at Dec. 31, 2020 (88,849)   $ 9 1,183 (90,041)
Beginning Balance, shares at Dec. 31, 2020     9,509,182    
Issuance of common stock upon exercise of stock options 11     11  
Issuance of common stock upon exercise of stock options, shares     16,862    
Stock-based compensation expense 277     277  
Net loss (12,240)       (12,240)
Ending Balance at Mar. 31, 2021   $ 117,331      
Ending Balance, shares at Mar. 31, 2021   12,767,202      
Ending Balance at Mar. 31, 2021 (100,801)   $ 9 1,471 (102,281)
Ending Balance, shares at Mar. 31, 2021     9,526,044    
Beginning Balance at Dec. 31, 2020   $ 117,331      
Beginning Balance, shares at Dec. 31, 2020   12,767,202      
Beginning Balance at Dec. 31, 2020 $ (88,849)   $ 9 1,183 (90,041)
Beginning Balance, shares at Dec. 31, 2020     9,509,182    
Issuance of common stock upon exercise of stock options, shares 222,850        
Net loss $ (29,855)        
Ending Balance at Jun. 30, 2021   $ 117,331      
Ending Balance, shares at Jun. 30, 2021   12,767,202      
Ending Balance at Jun. 30, 2021 (117,289)   $ 9 2,598 (119,896)
Ending Balance, shares at Jun. 30, 2021     9,732,032    
Beginning Balance at Mar. 31, 2021   $ 117,331      
Beginning Balance, shares at Mar. 31, 2021   12,767,202      
Beginning Balance at Mar. 31, 2021 (100,801)   $ 9 1,471 (102,281)
Beginning Balance, shares at Mar. 31, 2021     9,526,044    
Issuance of common stock upon exercise of stock options 196     196  
Issuance of common stock upon exercise of stock options, shares     205,988    
Stock-based compensation expense 931     931  
Net loss (17,615)       (17,615)
Ending Balance at Jun. 30, 2021   $ 117,331      
Ending Balance, shares at Jun. 30, 2021   12,767,202      
Ending Balance at Jun. 30, 2021 $ (117,289)   $ 9 $ 2,598 $ (119,896)
Ending Balance, shares at Jun. 30, 2021     9,732,032