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Unaudited Condensed Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Series H redeemable convertible preferred stock
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2018     63,005    
Beginning balance at Dec. 31, 2018 $ (111,966)   $ 0 $ 40,598 $ (152,564)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Accretion of redeemable convertible preferred stock (2,114)     (2,114)  
Exercise of stock options (in shares)     24    
Stock-based compensation 12     12  
Net loss (2,704)       (2,704)
Ending balance (in shares) at Mar. 31, 2019     63,029    
Ending balance at Mar. 31, 2019 $ (116,772)   $ 0 38,496 (155,268)
Beginning balance (in shares) at Dec. 31, 2018 532,606,084        
Beginning balance at Dec. 31, 2018 $ 105,232        
Increase (Decrease) in Temporary Equity [Roll Forward]          
Accretion of redeemable convertible preferred stock $ 2,114        
Issuance of Series redeemable convertible preferred stock for aggregate proceeds, net of issuance costs (in shares) 97,646,289        
Issuance of Series redeemable convertible preferred stock for aggregate proceeds, net of issuance costs $ 7,520        
Ending balance (in shares) at Mar. 31, 2019 630,252,373        
Ending balance at Mar. 31, 2019 $ 114,866        
Beginning balance (in shares) at Dec. 31, 2018     63,005    
Beginning balance at Dec. 31, 2018 (111,966)   $ 0 40,598 (152,564)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss (8,630)        
Ending balance (in shares) at Sep. 30, 2019     12,559,492    
Ending balance at Sep. 30, 2019 $ 58,650   $ 13 219,831 (161,194)
Beginning balance (in shares) at Dec. 31, 2018 532,606,084        
Beginning balance at Dec. 31, 2018 $ 105,232        
Increase (Decrease) in Temporary Equity [Roll Forward]          
Accretion of redeemable convertible preferred stock $ 4,640        
Deemed dividend recognized on beneficial conversion features of Series H redeemable convertible preferred stock (Note 7)   $ 6,741      
Ending balance (in shares) at Sep. 30, 2019 0        
Ending balance at Sep. 30, 2019 $ 0        
Beginning balance (in shares) at Mar. 31, 2019     63,029    
Beginning balance at Mar. 31, 2019 (116,772)   $ 0 38,496 (155,268)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Accretion of redeemable convertible preferred stock (2,188)     (2,188)  
Exercise of stock options (in shares)     26    
Stock-based compensation 11     11  
Net loss (2,785)       (2,785)
Ending balance (in shares) at Jun. 30, 2019     63,055    
Ending balance at Jun. 30, 2019 $ (121,734)   $ 0 36,319 (158,053)
Beginning balance (in shares) at Mar. 31, 2019 630,252,373        
Beginning balance at Mar. 31, 2019 $ 114,866        
Increase (Decrease) in Temporary Equity [Roll Forward]          
Accretion of redeemable convertible preferred stock $ 2,188        
Issuance of Series redeemable convertible preferred stock for aggregate proceeds, net of issuance costs (in shares) 51,282,048        
Issuance of Series redeemable convertible preferred stock for aggregate proceeds, net of issuance costs $ 3,972        
Ending balance (in shares) at Jun. 30, 2019 681,534,421        
Ending balance at Jun. 30, 2019 $ 121,026        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Accretion of redeemable convertible preferred stock (338)     (338)  
Stock-based compensation 62     62  
Issuance of Series H redeemable convertible preferred stock for aggregate proceeds of $0.047 per share, net of issuance costs of $318 (Note 7) 6,741     6,741  
Deemed dividend recognized on beneficial conversion features of Series H redeemable convertible preferred stock (6,741)     (6,741)  
Deemed dividend from conversion of Series G to Series H redeemable convertible preferred stock (6,860)     (6,860)  
Stock issued upon conversion of redeemable convertible preferred shares (in shares)     7,816,643    
Conversion of preferred stock to common stock in connection with initial public offering 138,906   $ 8 138,898  
Issuance of common stock in initial public offering, net of underwriting discount, commissions and issuance costs (Note 8) (in shares)     4,140,000    
Issuance of common stock in initial public offering, net of underwriting discount, commissions and issuance costs (Note 8) 50,518   $ 4 50,514  
Net exercise of common and preferred stock warrants (in shares)     539,794    
Net exercise of common and preferred stock warrants 511   $ 1 510  
Reclassification of redeemable convertible preferred stock warrant liabilities as equity 726     726  
Net loss (3,141)       (3,141)
Ending balance (in shares) at Sep. 30, 2019     12,559,492    
Ending balance at Sep. 30, 2019 58,650   $ 13 219,831 (161,194)
Increase (Decrease) in Temporary Equity [Roll Forward]          
Accretion of redeemable convertible preferred stock 338        
Issuance of Series redeemable convertible preferred stock for aggregate proceeds, net of issuance costs (in shares)   233,446,519      
Issuance of Series redeemable convertible preferred stock for aggregate proceeds, net of issuance costs   $ 3,941      
Deemed dividend recognized on beneficial conversion features of Series H redeemable convertible preferred stock (Note 7) $ 6,741 6,700      
Deemed dividend from conversion of Series G to Series H redeemable convertible preferred stock (Note 7) (in shares) 97,592,739        
Deemed dividend from conversion of Series G to Series H redeemable convertible preferred stock (Note 7) $ 6,860        
Conversion of preferred stock to common stock in connection with initial public offering (in shares) (1,012,573,679)        
Conversion of preferred stock to common stock in connection with initial public offering (Note 7) $ (138,906)        
Ending balance (in shares) at Sep. 30, 2019 0        
Ending balance at Sep. 30, 2019 $ 0        
Beginning balance (in shares) at Dec. 31, 2019 12,560,990   12,560,990    
Beginning balance at Dec. 31, 2019 $ 55,659   $ 13 220,248 (164,602)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options (in shares)     43,700    
Exercise of stock options 10     10  
Stock-based compensation 431     431  
Net exercise of common and preferred stock warrants (in shares)     22,366    
Net loss (5,563)       (5,563)
Ending balance (in shares) at Mar. 31, 2020     12,627,056    
Ending balance at Mar. 31, 2020 $ 50,537   $ 13 220,689 (170,165)
Beginning balance (in shares) at Dec. 31, 2019 12,560,990   12,560,990    
Beginning balance at Dec. 31, 2019 $ 55,659   $ 13 220,248 (164,602)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options (in shares) 47,354        
Net loss $ (13,234)        
Ending balance (in shares) at Sep. 30, 2020 12,652,113   12,652,113    
Ending balance at Sep. 30, 2020 $ 44,474   $ 13 222,297 (177,836)
Increase (Decrease) in Temporary Equity [Roll Forward]          
Accretion of redeemable convertible preferred stock 0        
Deemed dividend recognized on beneficial conversion features of Series H redeemable convertible preferred stock (Note 7)   $ 0      
Beginning balance (in shares) at Mar. 31, 2020     12,627,056    
Beginning balance at Mar. 31, 2020 50,537   $ 13 220,689 (170,165)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options (in shares)     3,599    
Exercise of stock options 2     2  
Stock-based compensation 647     647  
Net exercise of common and preferred stock warrants (in shares)     9,754    
Net exercise of common and preferred stock warrants 18     18  
Net loss (3,363)       (3,363)
Ending balance (in shares) at Jun. 30, 2020     12,640,409    
Ending balance at Jun. 30, 2020 47,841   $ 13 221,356 (173,528)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options (in shares)     55    
Issuance of stock under Employee Stock Purchase Plan (in shares)     11,649    
Issuance of stock under Employee Stock Purchase Plan 142     142  
Stock-based compensation 799     799  
Net loss $ (4,308)       (4,308)
Ending balance (in shares) at Sep. 30, 2020 12,652,113   12,652,113    
Ending balance at Sep. 30, 2020 $ 44,474   $ 13 $ 222,297 $ (177,836)