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Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) (Unaudited) - USD ($)
$ in Thousands
Total
Series E Preferred Stock
Series D Preferred Stock
Series C Preferred Stock
Series B Preferred Stock
Series A Preferred Stock
Limited Common Stock
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Loss
Non Controlling Interest
Beginning Balance at Dec. 31, 2018 $ (71,560)             $ 59 $ 8,915 $ (80,525) $ (9)  
Convertible preferred stock, Beginning Balance, Shares at Dec. 31, 2018   53,669,659 39,540,611 47,242,235 29,468,101 134,704,785            
Convertible preferred stock, Beginning Balance at Dec. 31, 2018   $ 79,377 $ 22,000 $ 19,844 $ 9,840 $ 30,626            
Beginning Balance, Shares at Dec. 31, 2018               5,906,976        
Change in unrealized (loss) gain on marketable securities 10                   10  
Issuances of common stock upon stock option exercise $ 115             $ 1 114      
Issuances of common stock upon stock option exercise, Shares 44,160             44,160        
Issuances of Series E preferred stock, net of issuance costs, Shares   3,354,353                    
Issuances of Series E preferred stock, net of issuance costs   $ 4,951                    
Stock-based compensation $ 520               520      
Contributions by non-controlling interest 100                     $ 100
Net loss (5,848)                 (5,794)   (54)
Ending Balance at Mar. 31, 2019 (76,663)             $ 60 9,549 (86,319) 1 46
Convertible preferred stock, Ending Balance, Shares at Mar. 31, 2019   57,024,012 39,540,611 47,242,235 29,468,101 134,704,785            
Convertible preferred stock, Ending Balance at Mar. 31, 2019   $ 84,328 $ 22,000 $ 19,844 $ 9,840 $ 30,626            
Ending Balance, Shares at Mar. 31, 2019               5,951,136        
Beginning Balance at Dec. 31, 2019 (93,323)             $ 61 11,655 (105,096) 16 41
Convertible preferred stock, Beginning Balance, Shares at Dec. 31, 2019   73,795,777 39,540,611 47,242,235 29,468,101 134,704,785            
Convertible preferred stock, Beginning Balance at Dec. 31, 2019 191,580 $ 109,270 $ 22,000 $ 19,844 $ 9,840 $ 30,626            
Beginning Balance, Shares at Dec. 31, 2019               6,121,821        
Change in unrealized (loss) gain on marketable securities (458)                   (458)  
Issuances of common stock upon stock option exercise $ 177             $ 1 176      
Issuances of common stock upon stock option exercise, Shares 57,581             57,581        
Stock-based compensation $ 1,775               1,775      
Issuances of common stock upon initial public offering, net of issuance costs 209,633             $ 136 209,497      
Issuances of common stock upon initial public offering, net of issuance costs, Shares.               13,664,704        
Conversion of convertible preferred stock into common stock 149,824             $ 303 149,521      
Temporary equity, conversion of convertible preferred stock into common stock, Shares   (73,795,777) (17,844,124)     (134,704,785)            
Temporary equity, conversion of convertible preferred stock into common stock   $ (109,270) $ (9,928)     $ (30,626)            
Conversion of convertible preferred stock into common stock, Shares               30,278,832        
Exchange of convertible preferred stock into limited common stock 41,756           $ 132   41,624      
Temporary equity, exchange of convertible preferred stock into limited common stock, Shares     (21,696,487) (47,242,235) (29,468,101)              
Temporary equity, exchange of convertible preferred stock into limited common stock     $ (12,072) $ (19,844) $ (9,840)              
Exchange of convertible preferred stock into limited common stock, Shares             13,164,193          
Contributions by non-controlling interest 435                     435
Net loss (14,271)                 (13,826)   (445)
Ending Balance at Mar. 31, 2020 $ 295,548           $ 132 $ 501 $ 414,248 $ (118,922) $ (442) $ 31
Ending Balance, Shares at Mar. 31, 2020             13,164,193 50,122,938