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Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Accumulated Other Comprehensive Loss
Convertible Preferred Stock
Common Class A
Common Class A
Common Stock
Common Class A
Additional Paid-in Capital
Beginning balance of temporary equity (in shares) at Dec. 31, 2018           67,704,278      
Beginning balance of temporary equity at Dec. 31, 2018           $ 243,244      
Beginning balance (in shares) at Dec. 31, 2018   14,549,801              
Beginning balance at Dec. 31, 2018 $ (219,987) $ 1 $ 11,165 $ (231,116) $ (37)        
Issuance of Class A common stock upon exercise of stock options (in shares)               898,858  
Issuance of Class A common stock upon exercise of stock options             $ 923   $ 923
Vesting of shares subject to repurchase, including early exercised options 72   72            
Stock-based compensation 1,359   1,359            
Net loss (3,636)     (3,636)          
Other comprehensive income (loss) (24)       (24)        
Ending balance of temporary equity (in shares) at Mar. 31, 2019           67,704,278      
Ending balance of temporary equity at Mar. 31, 2019           $ 243,244      
Ending balance (in shares) at Mar. 31, 2019   15,448,659              
Ending balance at Mar. 31, 2019 (221,293) $ 1 13,519 (234,752) (61)        
Beginning balance of temporary equity (in shares) at Dec. 31, 2018           67,704,278      
Beginning balance of temporary equity at Dec. 31, 2018           $ 243,244      
Beginning balance (in shares) at Dec. 31, 2018   14,549,801              
Beginning balance at Dec. 31, 2018 (219,987) $ 1 11,165 (231,116) (37)        
Net loss (14,514)                
Ending balance of temporary equity (in shares) at Jun. 30, 2019           67,704,278      
Ending balance of temporary equity at Jun. 30, 2019           $ 243,244      
Ending balance (in shares) at Jun. 30, 2019   16,145,382              
Ending balance at Jun. 30, 2019 (227,948) $ 1 17,715 (245,630) (34)        
Beginning balance of temporary equity (in shares) at Mar. 31, 2019           67,704,278      
Beginning balance of temporary equity at Mar. 31, 2019           $ 243,244      
Beginning balance (in shares) at Mar. 31, 2019   15,448,659              
Beginning balance at Mar. 31, 2019 (221,293) $ 1 13,519 (234,752) (61)        
Issuance of Class A common stock upon exercise of stock options (in shares)               696,723  
Issuance of Class A common stock upon exercise of stock options             1,082   1,082
Vesting of shares subject to repurchase, including early exercised options 89   89            
Stock-based compensation 3,025   3,025            
Net loss (10,878)     (10,878)          
Other comprehensive income (loss) 27       27        
Ending balance of temporary equity (in shares) at Jun. 30, 2019           67,704,278      
Ending balance of temporary equity at Jun. 30, 2019           $ 243,244      
Ending balance (in shares) at Jun. 30, 2019   16,145,382              
Ending balance at Jun. 30, 2019 (227,948) $ 1 17,715 (245,630) (34)        
Beginning balance of temporary equity (in shares) at Dec. 31, 2019           0      
Beginning balance of temporary equity at Dec. 31, 2019           $ 0      
Beginning balance (in shares) at Dec. 31, 2019   96,241,596              
Beginning balance at Dec. 31, 2019 420,083 $ 2 682,494 (262,367) (46)        
Issuance of Class A common stock upon exercise of stock options (in shares)               1,903,612  
Issuance of Class A common stock upon exercise of stock options             3,283   3,283
Vesting of shares subject to repurchase, including early exercised options 122   122            
Stock-based compensation 6,718   6,718            
Net loss (21,143)     (21,143)          
Other comprehensive income (loss) 5       5        
Ending balance of temporary equity (in shares) at Mar. 31, 2020           0      
Ending balance of temporary equity at Mar. 31, 2020           $ 0      
Ending balance (in shares) at Mar. 31, 2020   98,145,208              
Ending balance at Mar. 31, 2020 409,068 $ 2 692,617 (283,510) (41)        
Beginning balance of temporary equity (in shares) at Dec. 31, 2019           0      
Beginning balance of temporary equity at Dec. 31, 2019           $ 0      
Beginning balance (in shares) at Dec. 31, 2019   96,241,596              
Beginning balance at Dec. 31, 2019 $ 420,083 $ 2 682,494 (262,367) (46)        
Issuance of Class A common stock upon exercise of stock options (in shares) 3,858,369                
Net loss $ (61,310)                
Ending balance of temporary equity (in shares) at Jun. 30, 2020           0      
Ending balance of temporary equity at Jun. 30, 2020           $ 0      
Ending balance (in shares) at Jun. 30, 2020   100,259,182              
Ending balance at Jun. 30, 2020 391,269 $ 2 714,630 (323,677) 314        
Beginning balance of temporary equity (in shares) at Mar. 31, 2020           0      
Beginning balance of temporary equity at Mar. 31, 2020           $ 0      
Beginning balance (in shares) at Mar. 31, 2020   98,145,208              
Beginning balance at Mar. 31, 2020 409,068 $ 2 692,617 (283,510) (41)        
Issuance of Class A common stock related to equity awards (in shares)               2,113,974  
Issuance of Class A common stock related to equity awards             $ 8,051   $ 8,051
Vesting of shares subject to repurchase, including early exercised options 42   42            
Stock-based compensation 13,920   13,920            
Net loss (40,167)     (40,167)          
Other comprehensive income (loss) 355       355        
Ending balance of temporary equity (in shares) at Jun. 30, 2020           0      
Ending balance of temporary equity at Jun. 30, 2020           $ 0      
Ending balance (in shares) at Jun. 30, 2020   100,259,182              
Ending balance at Jun. 30, 2020 $ 391,269 $ 2 $ 714,630 $ (323,677) $ 314