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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Class B
Common Stock
Common Class A
Common Stock
Common Class A
Vesting of restricted stock units
Common Stock
Common Class A
Revest Shares
Common Stock
Common Class B
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Beginning balance (in shares) at Dec. 31, 2019       60,954,694     33,863,021        
Beginning balance at Dec. 31, 2019 $ 257,652 $ (252)   $ 1     $ 1 $ 449,463 $ 196 $ (192,009) $ (252)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Shares issued (in shares)       6,900,000              
Shares issued 274,177             274,177      
Vesting of early exercised stock options (in shares)             94,048        
Vesting of early exercised stock options 401             401      
Vesting of restricted stock units/awards (in shares)         905,093            
Shares issued under ESPP (in shares)       226,288              
Shares issued under ESPP 4,247             4,247      
Exercise of stock options (in shares)       3,802,613              
Exercise of stock options 12,953             12,953      
Exercise of common stock warrants (in shares)             144,635        
Stock-based compensation 35,990             35,990      
Conversion of stock (in shares)     144,635,000 22,727,685     (22,727,685)        
Net loss (50,228)                 (50,228)  
Other comprehensive income (loss) (72)               (72)    
Ending balance (in shares) at Sep. 30, 2020       95,516,373     11,374,019        
Ending balance at Sep. 30, 2020 534,868     $ 1     $ 1 777,231 124 (242,489)  
Beginning balance (in shares) at Jun. 30, 2020       90,321,462     14,716,313        
Beginning balance at Jun. 30, 2020 541,913     $ 1     $ 1 760,237 385 (218,711)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Vesting of early exercised stock options (in shares)             28,730        
Vesting of early exercised stock options 127             127      
Vesting of restricted stock units/awards (in shares)         844,635            
Exercise of stock options (in shares)       979,252              
Exercise of stock options 4,122             4,122      
Stock-based compensation 12,745             12,745      
Conversion of stock (in shares)     0 3,371,024     (3,371,024)        
Net loss (23,778)                 (23,778)  
Other comprehensive income (loss) (261)               (261)    
Ending balance (in shares) at Sep. 30, 2020       95,516,373     11,374,019        
Ending balance at Sep. 30, 2020 534,868     $ 1     $ 1 777,231 124 (242,489)  
Ending balance (in shares) at Dec. 31, 2020       103,394,496     10,228,700        
Ending balance at Dec. 31, 2020 1,061,865     $ 1     $ 1 1,350,050 6 (288,193)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Vesting of early exercised stock options (in shares)             43,095        
Vesting of early exercised stock options 192             192      
Vesting of restricted stock units/awards (in shares)         1,520,101 336,186          
Shares issued under ESPP (in shares)       153,678              
Shares issued under ESPP $ 5,719             5,719      
Exercise of stock options (in shares) 1,527,000     1,527,091              
Exercise of stock options $ 9,094             9,094      
Stock-based compensation 104,311             104,311      
Conversion of stock (in shares)       10,271,795     (10,271,795)        
Conversion of stock       $ 1     $ (1)        
Net loss (165,176)                 (165,176)  
Other comprehensive income (loss) (426)               (426)    
Ending balance (in shares) at Sep. 30, 2021       117,203,347     0        
Ending balance at Sep. 30, 2021 1,015,579     $ 2     $ 0 1,469,366 (420) (453,369)  
Beginning balance (in shares) at Jun. 30, 2021       106,259,339     9,708,299        
Beginning balance at Jun. 30, 2021 1,029,090     $ 1     $ 1 1,426,520 (261) (397,171)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Vesting of early exercised stock options (in shares)             14,366        
Vesting of early exercised stock options 64             64      
Vesting of restricted stock units/awards (in shares)         611,020 112,062          
Exercise of stock options (in shares)       498,261              
Exercise of stock options 3,489             3,489      
Stock-based compensation 39,293             39,293      
Conversion of stock (in shares)       9,722,665     (9,722,665)        
Conversion of stock       $ 1     $ (1)        
Net loss (56,198)                 (56,198)  
Other comprehensive income (loss) (159)               (159)    
Ending balance (in shares) at Sep. 30, 2021       117,203,347     0        
Ending balance at Sep. 30, 2021 $ 1,015,579     $ 2     $ 0 $ 1,469,366 $ (420) $ (453,369)