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Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Deficit [Member]
Total
Beginning balance at Dec. 31, 2019 $ 115,593 $ 1 $ 9,859   $ (108,452) $ (98,592)
Beginning balance, shares at Dec. 31, 2019 26,425,664 5,270,889        
Issuance of common stock upon exercise of stock options     185     185
Issuance of common stock upon exercise of stock options, shares   40,263        
Vesting of restricted common stock, shares   517,524        
Issuance of Series C convertible preferred stock, net of issuance costs of $2,640, shares 19,936,296          
Issuance of Series C convertible preferred stock, net of issuance costs of $2,640 $ 108,832          
Conversion of convertible preferred stock into common stock upon initial public offering, convertible preferred stock $ (224,425)          
Conversion of convertible preferred stock into common stock upon initial public offering, convertible preferred stock, shares (46,361,960)          
Conversion of convertible preferred stock into common stock upon initial public offering   $ 3 224,422     224,425
Conversion of convertible preferred stock into common stock upon initial public offering, shares   27,094,085        
Issuance of common stock upon initial public offering, net of issuance costs   $ 1 210,714     210,715
Issuance of common stock upon initial public offering, net of issuance costs, shares   12,105,263        
Stock-based compensation expense     2,872     2,872
Unrealized gains (losses) on marketable securities       $ (4)   (4)
Net loss         (35,448) (35,448)
Ending balance at Jun. 30, 2020   $ 5 448,052 (4) (143,900) 304,153
Ending balance, shares at Jun. 30, 2020   45,028,024        
Beginning balance at Mar. 31, 2020 $ 224,425 $ 1 11,517   (126,169) (114,651)
Beginning balance, shares at Mar. 31, 2020 46,361,960 5,570,652        
Issuance of common stock upon exercise of stock options     31     31
Issuance of common stock upon exercise of stock options, shares   5,434        
Vesting of restricted common stock, shares   252,590        
Conversion of convertible preferred stock into common stock upon initial public offering, convertible preferred stock $ (224,425)          
Conversion of convertible preferred stock into common stock upon initial public offering, convertible preferred stock, shares (46,361,960)          
Conversion of convertible preferred stock into common stock upon initial public offering   $ 3 224,422     224,425
Conversion of convertible preferred stock into common stock upon initial public offering, shares   27,094,085        
Issuance of common stock upon initial public offering, net of issuance costs   $ 1 210,714     210,715
Issuance of common stock upon initial public offering, net of issuance costs, shares   12,105,263        
Stock-based compensation expense     1,368     1,368
Unrealized gains (losses) on marketable securities       (4)   (4)
Net loss         (17,731) (17,731)
Ending balance at Jun. 30, 2020   $ 5 448,052 (4) (143,900) 304,153
Ending balance, shares at Jun. 30, 2020   45,028,024        
Beginning balance at Dec. 31, 2020   $ 5 456,974 9 (188,975) 268,013
Beginning balance, shares at Dec. 31, 2020   46,291,877        
Issuance of common stock upon exercise of stock options     2,250     2,250
Issuance of common stock upon exercise of stock options, shares   543,520        
Vesting of restricted common stock, shares   380,605        
Issuance of common stock upon initial public offering, net of issuance costs   $ 1 211,285     211,286
Issuance of common stock upon initial public offering, net of issuance costs, shares   9,200,000        
Issuance of common stock under other equity plans     355     355
Issuance of common stock under other equity plans, shares   15,511        
Stock-based compensation expense     7,856     7,856
Unrealized gains (losses) on marketable securities       (5)   (5)
Net loss         (56,353) (56,353)
Ending balance at Jun. 30, 2021   $ 6 678,720 4 (245,328) 433,402
Ending balance, shares at Jun. 30, 2021   56,431,513        
Beginning balance at Mar. 31, 2021   $ 6 673,257 10 (214,537) 458,736
Beginning balance, shares at Mar. 31, 2021   56,094,529        
Issuance of common stock upon exercise of stock options     731     731
Issuance of common stock upon exercise of stock options, shares   155,942        
Vesting of restricted common stock, shares   165,531        
Issuance of common stock upon initial public offering, net of issuance costs     355     355
Issuance of common stock upon initial public offering, net of issuance costs, shares   15,511        
Stock-based compensation expense     4,377     4,377
Unrealized gains (losses) on marketable securities       (6)   (6)
Net loss         (30,791) (30,791)
Ending balance at Jun. 30, 2021   $ 6 $ 678,720 $ 4 $ (245,328) $ 433,402
Ending balance, shares at Jun. 30, 2021   56,431,513