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Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity - USD ($)
$ in Thousands
Total
Common stock
Additional paid-in capital
Accumulated deficit
Accumulated other comprehensive income (loss)
Series Seed Convertible Preferred Stock
Series A Convertible Preferred Stock
Series B Convertible Preferred Stock
Convertible preferred stock, beginning balance (in shares) at Dec. 31, 2018           20,000,000 45,714,286 71,506,513
Convertible preferred stock, beginning balance at Dec. 31, 2018           $ 29,200 $ 79,615 $ 229,552
Increase (Decrease) in Temporary Equity [Roll Forward]                
Conversion of convertible preferred stock into common stock (in shares)           (20,000,000) (45,714,286) (71,506,513)
Conversion of convertible preferred stock into common stock           $ (29,200) $ (79,615) $ (229,552)
Convertible preferred stock, ending balance (in shares) at Mar. 31, 2019           0 0 0
Convertible preferred stock, ending balance at Mar. 31, 2019           $ 0 $ 0 $ 0
Beginning balance (in shares) at Dec. 31, 2018   8,051,418            
Beginning balance at Dec. 31, 2018 $ (120,069) $ 2 $ 33,853 $ (153,863) $ (61)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock in connection with a public offering, net of underwriting discounts, commissions, and offering costs (in shares)   19,837,500            
Issuance of common stock in connection with a public offering, net of underwriting discounts, commissions, and offering costs 291,344 $ 2 291,342          
Vesting of restricted stock (in shares)   1,619,592            
Stock-based compensation (in shares)   27,500            
Stock-based compensation 3,089   3,089          
Net loss (32,611)     (32,611)        
Other comprehensive income 140       140      
Conversion of convertible preferred stock into common stock (in shares)   30,493,460            
Conversion of convertible preferred stock into common stock 338,367 $ 3 338,364          
Ending balance (in shares) at Mar. 31, 2019   60,029,470            
Ending balance at Mar. 31, 2019 480,260 $ 7 666,648 (186,474) 79      
Convertible preferred stock, beginning balance (in shares) at Dec. 31, 2018           20,000,000 45,714,286 71,506,513
Convertible preferred stock, beginning balance at Dec. 31, 2018           $ 29,200 $ 79,615 $ 229,552
Beginning balance (in shares) at Dec. 31, 2018   8,051,418            
Beginning balance at Dec. 31, 2018 (120,069) $ 2 33,853 (153,863) (61)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net loss (125,609)              
Other comprehensive income 389              
Ending balance (in shares) at Sep. 30, 2019   60,984,958            
Ending balance at Sep. 30, 2019 398,873 $ 7 678,010 (279,472) 328      
Convertible preferred stock, beginning balance (in shares) at Mar. 31, 2019           0 0 0
Convertible preferred stock, beginning balance at Mar. 31, 2019           $ 0 $ 0 $ 0
Beginning balance (in shares) at Mar. 31, 2019   60,029,470            
Beginning balance at Mar. 31, 2019 480,260 $ 7 666,648 (186,474) 79      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Vesting of restricted stock (in shares)   404,637            
Exercise of stock option (in shares)   33,273            
Exercise of stock options 86   86          
Stock-based compensation 5,140   5,140          
Net loss (44,498)     (44,498)        
Other comprehensive income 417       417      
Other additional paid-in capital 39   39          
Ending balance (in shares) at Jun. 30, 2019   60,467,380            
Ending balance at Jun. 30, 2019 441,444 $ 7 671,913 (230,972) 496      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Vesting of restricted stock (in shares)   404,639            
Exercise of stock option (in shares)   112,939            
Exercise of stock options 369   369          
Stock-based compensation 5,728   5,728          
Net loss (48,500)     (48,500)        
Other comprehensive income (168)       (168)      
Ending balance (in shares) at Sep. 30, 2019   60,984,958            
Ending balance at Sep. 30, 2019 398,873 $ 7 678,010 (279,472) 328      
Beginning balance (in shares) at Dec. 31, 2019   61,635,477            
Beginning balance at Dec. 31, 2019 352,485 $ 7 686,390 (334,170) 258      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Vesting of restricted stock (in shares)   404,637            
Exercise of stock option (in shares)   4,309            
Exercise of stock options 15   15          
Stock-based compensation 8,244   8,244 0        
Issuance of common stock pursuant to Employee Stock Purchase Plan (in shares)   49,889            
Issuance of common stock pursuant to Employee Stock Purchase Plan 556   556          
Net loss (54,074)     (54,074)        
Other comprehensive income (763)       (763)      
Ending balance (in shares) at Mar. 31, 2020   62,094,000            
Ending balance at Mar. 31, 2020 306,463 $ 7 695,205 (388,244) (505)      
Beginning balance (in shares) at Dec. 31, 2019   61,635,477            
Beginning balance at Dec. 31, 2019 $ 352,485 $ 7 686,390 (334,170) 258      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Exercise of stock option (in shares) 76,275              
Net loss $ (178,756)              
Other comprehensive income 84              
Ending balance (in shares) at Sep. 30, 2020   72,472,912            
Ending balance at Sep. 30, 2020 372,101 $ 8 884,677 (512,926) 342      
Beginning balance (in shares) at Mar. 31, 2020   62,094,000            
Beginning balance at Mar. 31, 2020 306,463 $ 7 695,205 (388,244) (505)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock in connection with a public offering, net of underwriting discounts, commissions, and offering costs (in shares)   9,433,963            
Issuance of common stock in connection with a public offering, net of underwriting discounts, commissions, and offering costs 117,094 $ 1 117,093          
Equity component of convertible note issuance 53,635   53,635          
Debt issuance costs attributable to convertible feature (109)   (109)          
Vesting of restricted stock (in shares)   404,637            
Exercise of stock option (in shares)   39,698            
Exercise of stock options 139   139          
Stock-based compensation (in shares)   0            
Stock-based compensation 8,900   8,900          
Net loss (66,870)     (66,870)        
Other comprehensive income 1,072       1,072      
Ending balance (in shares) at Jun. 30, 2020   71,972,610            
Ending balance at Jun. 30, 2020 420,324 $ 8 874,863 (455,114) 567      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Vesting of restricted stock (in shares)   404,637            
Exercise of stock option (in shares)   32,268            
Exercise of stock options 131   131          
Stock-based compensation 8,923   8,923 0        
Issuance of common stock pursuant to Employee Stock Purchase Plan (in shares)   63,397            
Issuance of common stock pursuant to Employee Stock Purchase Plan 744   744          
Net loss (57,812)     (57,812)        
Other comprehensive income (225)       (225)      
Other additional paid-in capital 16   16          
Ending balance (in shares) at Sep. 30, 2020   72,472,912            
Ending balance at Sep. 30, 2020 $ 372,101 $ 8 $ 884,677 $ (512,926) $ 342