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Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholder's Deficit (Unaudited) - USD ($)
$ in Thousands
Total
Redeemable Convertible Preferred Stock
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income [Member]
Beginning balance at Dec. 31, 2019   $ 26,174        
Beginning balance (in shares) at Dec. 31, 2019   3,999,133        
Beginning balance at Dec. 31, 2019 $ (5,562)   $ 1 $ 1,905 $ (7,468) $ 0
Beginning balance, shares at Dec. 31, 2019     1,852,797      
Accretion of Series A and A-1 Preferred Stock (439) $ 439   (439)    
Release of restricted stock awards     $ 4,170      
Stock-based compensation 134     134    
Net loss (1,916)       (1,916)  
Ending balance at Mar. 31, 2020 (7,783)   $ 1 1,600 (9,384) 0
Ending balance, shares at Mar. 31, 2020     1,856,967      
Ending balance at Mar. 31, 2020   $ 26,613        
Ending balance (in shares) at Mar. 31, 2020   3,999,133        
Beginning balance at Dec. 31, 2019   $ 26,174        
Beginning balance (in shares) at Dec. 31, 2019   3,999,133        
Beginning balance at Dec. 31, 2019 (5,562)   $ 1 1,905 (7,468) 0
Beginning balance, shares at Dec. 31, 2019     1,852,797      
Accretion of Series A and A-1 Preferred Stock 1,352          
Net loss (5,805)          
Ending balance at Sep. 30, 2020 (12,485)   $ 1 787 (13,273) 0
Ending balance, shares at Sep. 30, 2020     1,865,316      
Ending balance at Sep. 30, 2020   $ 27,526        
Ending balance (in shares) at Sep. 30, 2020   3,999,133        
Beginning balance at Mar. 31, 2020   $ 26,613        
Beginning balance (in shares) at Mar. 31, 2020   3,999,133        
Beginning balance at Mar. 31, 2020 (7,783)   $ 1 1,600 (9,384) 0
Beginning balance, shares at Mar. 31, 2020     1,856,967      
Accretion of Series A and A-1 Preferred Stock (452) $ 452   (452)    
Release of restricted stock awards, shares     4,174      
Stock-based compensation 51     51    
Net loss (1,631)       (1,631)  
Ending balance at Jun. 30, 2020 (9,815)   $ 1 1,199 (11,015) 0
Ending balance, shares at Jun. 30, 2020     1,861,141      
Ending balance at Jun. 30, 2020   $ 27,065        
Ending balance (in shares) at Jun. 30, 2020   3,999,133        
Accretion of Series A and A-1 Preferred Stock (461) $ 461   (461)    
Release of restricted stock awards, shares     4,175      
Stock-based compensation 49     49    
Net loss (2,258)       (2,258)  
Ending balance at Sep. 30, 2020 (12,485)   $ 1 787 (13,273) 0
Ending balance, shares at Sep. 30, 2020     1,865,316      
Ending balance at Sep. 30, 2020   $ 27,526        
Ending balance (in shares) at Sep. 30, 2020   3,999,133        
Beginning balance at Dec. 31, 2020 $ 46,551 $ 46,551        
Beginning balance (in shares) at Dec. 31, 2020 7,140,157 7,140,157        
Beginning balance at Dec. 31, 2020 $ (24,983)   $ 1 3,152 (28,136) 0
Beginning balance, shares at Dec. 31, 2020     3,418,751      
Series A-1 Preferred Stock Issuance (net of issuance costs and tranche liability)   $ 33,978        
Series A-1 Preferred Stock Issuance (net of issuance costs and tranche liability), shares   4,358,972        
Reclassification of redeemable convertible preferred stock tranche liability upon settlement   $ 12,269        
Exercise of stock options and release of restricted stock awards 105     105    
Exercise of stock options and release of restricted stock awards, shares     64,047      
Stock-based compensation 297     297    
Net loss (18,601)       (18,601)  
Ending balance at Mar. 31, 2021 (43,182)   $ 1 3,554 (46,737) 0
Ending balance, shares at Mar. 31, 2021     3,482,798      
Ending balance at Mar. 31, 2021   $ 92,798        
Ending balance (in shares) at Mar. 31, 2021   11,499,129        
Beginning balance at Dec. 31, 2020 $ 46,551 $ 46,551        
Beginning balance (in shares) at Dec. 31, 2020 7,140,157 7,140,157        
Beginning balance at Dec. 31, 2020 $ (24,983)   $ 1 3,152 (28,136) 0
Beginning balance, shares at Dec. 31, 2020     3,418,751      
Reclassification of redeemable convertible preferred stock tranche liability upon settlement (12,269)          
Accretion of Series A and A-1 Preferred Stock 0          
Net loss (36,935)          
Ending balance at Sep. 30, 2021 176,661   $ 3 241,747 (65,071) (18)
Ending balance, shares at Sep. 30, 2021     26,199,262      
Ending balance at Sep. 30, 2021 $ 0 $ 0        
Ending balance (in shares) at Sep. 30, 2021 0 0        
Beginning balance at Mar. 31, 2021   $ 92,798        
Beginning balance (in shares) at Mar. 31, 2021   11,499,129        
Beginning balance at Mar. 31, 2021 $ (43,182)   $ 1 3,554 (46,737) 0
Beginning balance, shares at Mar. 31, 2021     3,482,798      
Series A-1 Preferred Stock Issuance (net of issuance costs and tranche liability)   $ 59,961        
Series A-1 Preferred Stock Issuance (net of issuance costs and tranche liability), shares   3,846,150        
Exercise of stock options and release of restricted stock awards 6     6  
Exercise of stock options and release of restricted stock awards, shares     7,158      
Stock-based compensation 1,050     1,050  
Net loss (8,719)       (8,719)  
Ending balance at Jun. 30, 2021 (50,845)   $ 1 4,610 (55,456) 0
Ending balance, shares at Jun. 30, 2021     3,489,956      
Ending balance at Jun. 30, 2021   $ 152,759        
Ending balance (in shares) at Jun. 30, 2021   15,345,279        
Proceeds from issuance of common stock in initial public offering 83,144   $ 1 83,143  
Proceeds from issuance of common stock in initial public offering, Shares     7,360,000      
Conversion of redeemable convertible preferred stock to common stock upon initial public offering 152,759 $ (152,759) $ 1 152,758  
Conversion of redeemable convertible preferred stock to common stock upon initial public offering, Shares   (15,345,279) 15,345,279      
Release of restricted stock awards, shares     4,027      
Stock-based compensation 1,236     1,236  
Other comprehensive loss (18)         (18)
Net loss (9,615)       (9,615)  
Ending balance at Sep. 30, 2021 176,661   $ 3 $ 241,747 $ (65,071) $ (18)
Ending balance, shares at Sep. 30, 2021     26,199,262      
Ending balance at Sep. 30, 2021 $ 0 $ 0        
Ending balance (in shares) at Sep. 30, 2021 0 0