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CONDENSED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
$ in Thousands
Total
Convertible Preferred Stock Series C
Redeemable Convertible Preferred Stock Series A, B, D, E-1, E-2, E-2A, E-3 and F
Series E-1
Series E-3
Series F
Preferred Stock
Common Stock
Additional Paid-in Capital
Additional Paid-in Capital
Series E-1
Additional Paid-in Capital
Series E-3
Additional Paid-in Capital
Series F
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2018   503,056 9,456,775                    
Beginning balance at Dec. 31, 2018   $ 1,501 $ 44,995                    
Increase (Decrease) in Temporary Equity [Roll Forward]                          
Accretion of redeemable convertible preferred stock to redemption value:       $ 2 $ 7 $ 121              
Exercise of redeemable convertible preferred stock warrants (in shares)       12,999   1,054              
Exercise of redeemable convertible preferred stock warrants: $ 0     $ 107   $ 10              
Conversion of convertible preferred stock (in shares)   (503,056) (9,470,828)         8,181,992          
Conversion of convertible preferred stock 46,743 $ (1,501) $ (45,242)         $ 8 $ 46,735        
Ending balance (in shares) at Sep. 30, 2019   0 0                    
Ending balance at Sep. 30, 2019   $ 0 $ 0                    
Beginning balance (in shares) at Dec. 31, 2018             0 1,916,224          
Beginning balance at Dec. 31, 2018 (56,566)           $ 0 $ 2 921       $ (57,489)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Stock compensation expense 536               536        
Exercise of common stock options (in shares)               687,520          
Exercise of common stock options 1,164               1,164        
Accretion of redeemable convertible preferred stock to redemption value:       $ (2) (7) $ (121)       $ (2) $ (7) $ (121)  
Exercise of redeemable convertible preferred stock warrants (in shares)       12,999   1,054              
Exercise of redeemable convertible preferred stock warrants: 0     $ 107   $ 10              
Recognition of beneficial conversion feature on convertible promissory notes 8,378               8,378        
Extinguishment of beneficial conversion feature on convertible promissory notes (15,265)               (15,265)        
Public offering of common stock, net of underwriting discounts, commissions and offering costs (in shares)               4,600,000          
Public offering of common stock, net of underwriting discounts, commissions and offering costs 65,931             $ 5 65,926        
Conversion of convertible promissory notes (in shares)               1,661,106          
Conversion of convertible promissory notes 26,578             $ 2 26,576        
Conversion of convertible preferred stock (in shares)   (503,056) (9,470,828)         8,181,992          
Conversion of convertible preferred stock 46,743 $ (1,501) $ (45,242)         $ 8 46,735        
Reclassification of preferred stock warrant liability and net exercise of certain warrants for common stock in connection with initial public offering (in shares)               27,207          
Reclassification of preferred stock warrant liability and net exercise of certain warrants for common stock in connection with initial public offering 1,745               1,745        
Net (loss) income 3,222                       3,222
Ending balance (in shares) at Sep. 30, 2019             0 17,074,049          
Ending balance at Sep. 30, 2019 82,336           $ 0 $ 17 136,586       (54,267)
Beginning balance (in shares) at Jun. 30, 2019   503,056 9,456,775                    
Beginning balance at Jun. 30, 2019   $ 1,501 $ 45,108                    
Increase (Decrease) in Temporary Equity [Roll Forward]                          
Accretion of redeemable convertible preferred stock to redemption value:         1 $ 16              
Exercise of redeemable convertible preferred stock warrants (in shares)       12,999   1,054              
Exercise of redeemable convertible preferred stock warrants: 0     $ 107   $ 10              
Conversion of convertible preferred stock (in shares)   (503,056) (9,470,828)         8,181,992          
Conversion of convertible preferred stock 46,743 $ (1,501) $ (45,242)         $ 8 46,735        
Ending balance (in shares) at Sep. 30, 2019   0 0                    
Ending balance at Sep. 30, 2019   $ 0 $ 0                    
Beginning balance (in shares) at Jun. 30, 2019             0 2,192,461          
Beginning balance at Jun. 30, 2019 (50,204)           $ 0 $ 2 9,910       (60,116)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Stock compensation expense 229               229        
Exercise of common stock options (in shares)               411,283          
Exercise of common stock options 747               747        
Accretion of redeemable convertible preferred stock to redemption value:         $ (1) $ (16)         $ (1) $ (16)  
Exercise of redeemable convertible preferred stock warrants (in shares)       12,999   1,054              
Exercise of redeemable convertible preferred stock warrants: 0     $ 107   $ 10              
Extinguishment of beneficial conversion feature on convertible promissory notes (15,265)               (15,265)        
Public offering of common stock, net of underwriting discounts, commissions and offering costs (in shares)               4,600,000          
Public offering of common stock, net of underwriting discounts, commissions and offering costs 65,931             $ 5 65,926        
Conversion of convertible promissory notes (in shares)               1,661,106          
Conversion of convertible promissory notes 26,578             $ 2 26,576        
Conversion of convertible preferred stock (in shares)   (503,056) (9,470,828)         8,181,992          
Conversion of convertible preferred stock 46,743 $ (1,501) $ (45,242)         $ 8 46,735        
Reclassification of preferred stock warrant liability and net exercise of certain warrants for common stock in connection with initial public offering (in shares)               27,207          
Reclassification of preferred stock warrant liability and net exercise of certain warrants for common stock in connection with initial public offering 1,745               1,745        
Net (loss) income 5,849                       5,849
Ending balance (in shares) at Sep. 30, 2019             0 17,074,049          
Ending balance at Sep. 30, 2019 82,336           $ 0 $ 17 136,586       (54,267)
Beginning balance (in shares) at Dec. 31, 2019   0 0                    
Beginning balance at Dec. 31, 2019   $ 0 $ 0                    
Ending balance (in shares) at Sep. 30, 2020   0 0                    
Ending balance at Sep. 30, 2020   $ 0 $ 0                    
Beginning balance (in shares) at Dec. 31, 2019             0 17,130,907          
Beginning balance at Dec. 31, 2019 85,113           $ 0 $ 17 137,308       (52,212)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Stock compensation expense $ 5,348               5,348        
Exercise of common stock options (in shares) 332,065             332,065          
Exercise of common stock options $ 693             $ 1 692        
Public offering of common stock, net of underwriting discounts, commissions and offering costs (in shares)               2,300,000          
Public offering of common stock, net of underwriting discounts, commissions and offering costs 79,504             $ 2 79,502        
Issuance of common stock under the employee stock purchase plan (in shares)               81,454          
Issuance of common stock under the employee stock purchase plan 1,296               1,296        
Net (loss) income (5,395)                       (5,395)
Ending balance (in shares) at Sep. 30, 2020             0 19,844,426          
Ending balance at Sep. 30, 2020 166,559           $ 0 $ 20 224,146       (57,607)
Beginning balance (in shares) at Jun. 30, 2020   0 0                    
Beginning balance at Jun. 30, 2020   $ 0 $ 0                    
Ending balance (in shares) at Sep. 30, 2020   0 0                    
Ending balance at Sep. 30, 2020   $ 0 $ 0                    
Beginning balance (in shares) at Jun. 30, 2020             0 19,373,869          
Beginning balance at Jun. 30, 2020 157,622           $ 0 $ 19 210,621       (53,018)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Stock compensation expense 2,118               2,118        
Exercise of common stock options (in shares)               129,090          
Exercise of common stock options 292             $ 1 291        
Public offering of common stock, net of underwriting discounts, commissions and offering costs (in shares)               300,000          
Public offering of common stock, net of underwriting discounts, commissions and offering costs 10,423               10,423        
Issuance of common stock under the employee stock purchase plan (in shares)               41,467          
Issuance of common stock under the employee stock purchase plan 693               693        
Net (loss) income (4,589)                       (4,589)
Ending balance (in shares) at Sep. 30, 2020             0 19,844,426          
Ending balance at Sep. 30, 2020 $ 166,559           $ 0 $ 20 $ 224,146       $ (57,607)