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CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS EQUITY (DEFICIT) (unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock, beginning balance at Dec. 31, 2018 $ 89,404         $ 89,404
Redeemable convertible preferred stock, beginning balance, shares at Dec. 31, 2018 18,474,742         18,474,742
Beginning balance at Dec. 31, 2018 $ (106,388) $ 1 $ 9,131 $ (15) $ (115,505)  
Beginning balance, shares at Dec. 31, 2018   3,085,307        
Issuance of common stock warrants 572   572      
Elimination of fractional shares upon reverse stock split (see Note 8)   $ (1) 1      
Redeemable convertible preferred stock, Elimination of fractional shares upon reverse stock split (see Note8)           (39)
Elimination of fractional shares upon reverse stock split (see Note 8), shares   (34)        
Exercise of common stock warrants 8   8      
Exercise of common stock warrants, shares   207,712        
Conversion of Series A, B and C redeemable convertible preferred stock to common stock 89,404 $ 2 89,402      
Redeemable convertible preferred stock, Conversion of Series A, B and C redeemable convertible preferred stock to common stock, shares           (18,474,703)
Redeemable convertible preferred stock, Conversion of Series A, B and C redeemable convertible preferred stock to common stock           $ (89,404)
Conversion of Series A, B and C redeemable convertible preferred stock to common stock, shares   18,474,703        
Conversion of redeemable convertible preferred stock warrants to common stock warrants 2,086   2,086      
Proceeds from initial public/follow-on offering, net of expenses 139,828 $ 1 139,827      
Proceeds from initial public/follow-on offering, net of expenses, shares   9,109,725        
Proceeds from exercise of stock options 678   678      
Proceeds from exercise of stock options, shares   265,230        
Stock-based compensation 3,657   3,657      
Foreign currency translation adjustment (2)     (2)    
Unrealized gain (loss) on available-for-sale debt securities (12)     (12)    
Net loss (18,439)       (18,439)  
Ending balance at Sep. 30, 2019 111,392 $ 3 245,362 (29) (133,944)  
Ending balance, shares at Sep. 30, 2019   31,142,643        
Beginning balance at Jun. 30, 2019 117,018 $ 3 244,089 (15) (127,059)  
Beginning balance, shares at Jun. 30, 2019   31,121,605        
Costs related to initial public offering (197)   (197)      
Proceeds from exercise of stock options 68   68      
Proceeds from exercise of stock options, shares   21,038        
Stock-based compensation 1,402   1,402      
Foreign currency translation adjustment (2)     (2)    
Unrealized gain (loss) on available-for-sale debt securities (12)     (12)    
Net loss (6,885)       (6,885)  
Ending balance at Sep. 30, 2019 111,392 $ 3 245,362 (29) (133,944)  
Ending balance, shares at Sep. 30, 2019   31,142,643        
Beginning balance at Dec. 31, 2019 106,690 $ 3 247,282 (6) (140,589)  
Beginning balance, shares at Dec. 31, 2019   31,243,029        
Exercise of common stock warrants, shares   79,772        
Proceeds from initial public/follow-on offering, net of expenses 117,065 $ 1 117,064      
Proceeds from initial public/follow-on offering, net of expenses, shares   6,578,947        
Proceeds from exercise of stock options 2,289   2,289      
Proceeds from exercise of stock options, shares   740,630        
Proceeds from Employee Stock Purchase Plan purchases 631   631      
Proceeds from Employee Stock Purchase Plan purchases, shares   71,480        
Restricted stock units released, shares   76,331        
Stock-based compensation 4,761   4,761      
Foreign currency translation adjustment (2)     (2)    
Unrealized gain (loss) on available-for-sale debt securities 45     45    
Net loss (27,939)       (27,939)  
Ending balance at Sep. 30, 2020 203,540 $ 4 372,027 37 (168,528)  
Ending balance, shares at Sep. 30, 2020   38,790,189        
Beginning balance at Jun. 30, 2020 93,123 $ 3 251,997 106 (158,983)  
Beginning balance, shares at Jun. 30, 2020   31,872,122        
Exercise of common stock warrants, shares   79,772        
Proceeds from initial public/follow-on offering, net of expenses 117,065 $ 1 117,064      
Proceeds from initial public/follow-on offering, net of expenses, shares   6,578,947        
Proceeds from exercise of stock options 1,276   1,276      
Proceeds from exercise of stock options, shares   226,637        
Restricted stock units released, shares   32,711        
Stock-based compensation 1,690   1,690      
Foreign currency translation adjustment 6     6    
Unrealized gain (loss) on available-for-sale debt securities (75)     (75)    
Net loss (9,545)       (9,545)  
Ending balance at Sep. 30, 2020 $ 203,540 $ 4 $ 372,027 $ 37 $ (168,528)  
Ending balance, shares at Sep. 30, 2020   38,790,189