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STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (Unaudited) - USD ($)
$ in Thousands
Total
Initial Public Offering
Convertible Preferred Stock
Common Stock
Common Stock
Initial Public Offering
Additional Paid-in Capital
Additional Paid-in Capital
Initial Public Offering
Accumulated Deficit
Accumulated Other Comprehensive Gain (Loss)
Beginning Balance at Dec. 31, 2019     $ 178,058            
Beginning Balance (in shares) at Dec. 31, 2019     19,278,606            
Beginning Balance at Dec. 31, 2019 $ (90,084)       $ 2,606   $ (92,690)
Beginning Balance (in shares) at Dec. 31, 2019       1,984,222          
Exercise of common stock options 12         12      
Exercise of common stock options (in shares)       13,433          
Stock-based compensation expense 527         527      
Net loss (8,872)             (8,872)  
Ending Balance at Mar. 31, 2020     $ 178,058            
Ending Balance (in shares) at Mar. 31, 2020     19,278,606            
Ending Balance at Mar. 31, 2020 (98,417)       3,145   (101,562)
Ending Balance (in shares) at Mar. 31, 2020       1,997,655          
Beginning Balance at Dec. 31, 2019     $ 178,058            
Beginning Balance (in shares) at Dec. 31, 2019     19,278,606            
Beginning Balance at Dec. 31, 2019 (90,084)       2,606   (92,690)
Beginning Balance (in shares) at Dec. 31, 2019       1,984,222          
Unrealized (loss) gain on available-for-sale investments (29)                
Ending Balance at Sep. 30, 2020 184,375     $ 3   322,535   (138,134) (29)
Ending Balance (in shares) at Sep. 30, 2020       30,545,165          
Beginning Balance at Mar. 31, 2020     $ 178,058            
Beginning Balance (in shares) at Mar. 31, 2020     19,278,606            
Beginning Balance at Mar. 31, 2020 (98,417)       3,145   (101,562)
Beginning Balance (in shares) at Mar. 31, 2020       1,997,655          
Issuance of common stock   $ 138,000     $ 1   $ 137,999    
Issuance of common stock (in shares)         8,625,000        
Exercise of common stock options 39         39      
Exercise of common stock options (in shares)       23,200          
Stock-based compensation expense 1,381         1,381      
Issuance costs associated with initial public offering   $ (12,790)         $ (12,790)    
Conversion to common stock     $ (178,058)            
Conversion to common stock (in shares)     (19,278,606)            
Conversion to common stock 178,058     $ 2   178,056      
Conversion to common stock (in shares)       19,278,606          
Net loss (11,024)             (11,024)  
Ending Balance at Jun. 30, 2020                
Ending Balance (in shares) at Jun. 30, 2020                
Ending Balance at Jun. 30, 2020 195,247     $ 3   307,830   (112,586)
Ending Balance (in shares) at Jun. 30, 2020       29,924,461          
Exercise of common stock options 53         53      
Exercise of common stock options (in shares)       32,469          
Stock-based compensation expense 1,681         1,681      
Issuance of common stock related to acquisition 12,971         12,971      
Issuance of common stock related to acquisition, shares       588,235          
Unrealized (loss) gain on available-for-sale investments (29)               (29)
Net loss (25,548)             (25,548)  
Ending Balance at Sep. 30, 2020 184,375     $ 3   322,535   (138,134) (29)
Ending Balance (in shares) at Sep. 30, 2020       30,545,165          
Beginning Balance at Dec. 31, 2020 $ 289,776     $ 4   456,196   (166,393) (31)
Beginning Balance (in shares) at Dec. 31, 2020 36,672,415     36,672,415          
Exercise of common stock options $ 16         16      
Exercise of common stock options (in shares)       18,411          
Stock-based compensation expense 2,744         2,744      
Unrealized (loss) gain on available-for-sale investments 48               48
Net loss (16,509)             (16,509)  
Ending Balance at Mar. 31, 2021 276,075     $ 4   458,956   (182,902) 17
Ending Balance (in shares) at Mar. 31, 2021       36,690,826          
Beginning Balance at Dec. 31, 2020 $ 289,776     $ 4   456,196   (166,393) (31)
Beginning Balance (in shares) at Dec. 31, 2020 36,672,415     36,672,415          
Exercise of common stock options (in shares) 61,768                
Unrealized (loss) gain on available-for-sale investments $ 29                
Ending Balance at Sep. 30, 2021 $ 291,536     $ 4   513,871   (222,337) (2)
Ending Balance (in shares) at Sep. 30, 2021 39,331,585     39,331,585          
Beginning Balance at Mar. 31, 2021 $ 276,075     $ 4   458,956   (182,902) 17
Beginning Balance (in shares) at Mar. 31, 2021       36,690,826          
Exercise of common stock options 58         58      
Exercise of common stock options (in shares)       24,786          
Stock-based compensation expense 3,213         3,213      
Unrealized (loss) gain on available-for-sale investments (14)               (14)
Net loss (21,009)             (21,009)  
Ending Balance at Jun. 30, 2021 258,323     $ 4   462,227   (203,911) 3
Ending Balance (in shares) at Jun. 30, 2021       36,715,612          
Issuance of common stock 50,000         50,000      
Issuance of common stock (in shares)       2,597,402          
Issuance costs associated with offering of common stock (1,852)         1,852      
Exercise of common stock options 99         99      
Exercise of common stock options (in shares)       18,571          
Stock-based compensation expense 3,397         3,397      
Unrealized (loss) gain on available-for-sale investments (5)               (5)
Net loss (18,426)             (18,426)  
Ending Balance at Sep. 30, 2021 $ 291,536     $ 4   $ 513,871   $ (222,337) $ (2)
Ending Balance (in shares) at Sep. 30, 2021 39,331,585     39,331,585