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Condensed Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Redeemable Convertible Preferred Stock [Member]
Temporary equity, Beginning balance at Dec. 31, 2019         $ 53,174
Temporary equity, Beginning balance, shares at Dec. 31, 2019         15,714,283
Beginning balance at Dec. 31, 2019 $ (58,777)   $ 5,010 $ (63,787)  
Beginning balance, shares at Dec. 31, 2019   664,431      
Issuance of Series B redeemable convertible preferred stock for cash, net         $ 21,458
Issuance of Series B redeemable convertible preferred stock for cash, net, Shares         10,027,666
Issuance of Series B redeemable convertible preferred stock upon conversion of convertible notes         $ 10,095
Issuance of Series B redeemable convertible preferred stock upon conversion of convertible notes, Shares         4,673,388
Exercise of common stock options and vesting of early exercised common stock options 6   6    
Exercise of common stock options and vesting of early exercised common stock options, Shares   5,350      
Stock-based compensation 47   47    
Net loss and comprehensive loss (5,279)     (5,279)  
Temporary Equity, Ending balance at Mar. 31, 2020         $ 84,727
Temporary Equity, Ending balance, shares at Mar. 31, 2020         30,415,337
Ending balance at Mar. 31, 2020 (64,003)   5,063 (69,066)  
Ending balance, shares at Mar. 31, 2020   669,781      
Temporary equity, Beginning balance at Dec. 31, 2019         $ 53,174
Temporary equity, Beginning balance, shares at Dec. 31, 2019         15,714,283
Beginning balance at Dec. 31, 2019 (58,777)   5,010 (63,787)  
Beginning balance, shares at Dec. 31, 2019   664,431      
Net loss and comprehensive loss (11,746)        
Temporary Equity, Ending balance at Jun. 30, 2020         $ 96,775
Temporary Equity, Ending balance, shares at Jun. 30, 2020         30,415,337
Ending balance at Jun. 30, 2020 (70,340)   5,193 (75,533)  
Ending balance, shares at Jun. 30, 2020   671,624      
Temporary equity, Beginning balance at Mar. 31, 2020         $ 84,727
Temporary equity, Beginning balance, shares at Mar. 31, 2020         30,415,337
Beginning balance at Mar. 31, 2020 (64,003)   5,063 (69,066)  
Beginning balance, shares at Mar. 31, 2020   669,781      
Proceeds received in advance of issuance of Series B redeemable convertible preferred stock (Note 7)         $ 12,048
Exercise of common stock options and vesting of early exercised common stock options 2   2    
Exercise of common stock options and vesting of early exercised common stock options, Shares   1,843      
Stock-based compensation 128   128    
Net loss and comprehensive loss (6,467)     (6,467)  
Temporary Equity, Ending balance at Jun. 30, 2020         $ 96,775
Temporary Equity, Ending balance, shares at Jun. 30, 2020         30,415,337
Ending balance at Jun. 30, 2020 (70,340)   5,193 (75,533)  
Ending balance, shares at Jun. 30, 2020   671,624      
Beginning balance at Dec. 31, 2020 $ 382,877 $ 3 479,608 (96,734)  
Beginning balance, shares at Dec. 31, 2020 34,701,274 34,701,274      
Exercise of common stock options and vesting of early exercised common stock options $ 254   254    
Exercise of common stock options and vesting of early exercised common stock options, Shares   125,930      
Stock-based compensation 4,285   4,285    
Net loss and comprehensive loss (18,867)     (18,867)  
Ending balance at Mar. 31, 2021 368,549 $ 3 484,147 (115,601)  
Ending balance, shares at Mar. 31, 2021   34,827,204      
Beginning balance at Dec. 31, 2020 $ 382,877 $ 3 479,608 (96,734)  
Beginning balance, shares at Dec. 31, 2020 34,701,274 34,701,274      
Exercise of common stock options and vesting of early exercised common stock options, Shares 165,331        
Net loss and comprehensive loss $ (43,363)        
Ending balance at Jun. 30, 2021 $ 349,650   489,743 (140,097)  
Ending balance, shares at Jun. 30, 2021 34,963,085 34,963,085      
Beginning balance at Mar. 31, 2021 $ 368,549 $ 3 484,147 (115,601)  
Beginning balance, shares at Mar. 31, 2021   34,827,204      
Exercise of common stock options, shares issued under the employee stock purchase plan, and vesting of early exercised common stock options 867 $ 1 866    
Exercise of common stock options, shares issued under the employee stock purchase plan, and vesting of early exercised common stock options, Shares   135,881      
Stock-based compensation 4,730   4,730    
Net loss and comprehensive loss (24,496)     (24,496)  
Ending balance at Jun. 30, 2021 $ 349,650   $ 489,743 $ (140,097)  
Ending balance, shares at Jun. 30, 2021 34,963,085 34,963,085