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Condensed Consolidated Statements of Changes in Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Conversion of redeemable convertible preferred stock to common stock
Conversion of convertible notes with related parties to common stock
Conversion of Class B stock to Class A stock
Cumulative-effect of accounting change adopted as of January 1, 2020
Common Stock
Treasury Stock
Additional Paid-in Capital
Additional Paid-in Capital
Conversion of redeemable convertible preferred stock to common stock
Additional Paid-in Capital
Conversion of convertible notes with related parties to common stock
Additional Paid-in Capital
Cumulative-effect of accounting change adopted as of January 1, 2020
Retained Earnings
Retained Earnings
Cumulative-effect of accounting change adopted as of January 1, 2020
Series A Preferred Stock
Series B Preferred Stock
Common Class A
Common Stock
Common Class A
Common Stock
Conversion of Class B stock to Class A stock
Common Class B
Common Stock
Common Class B
Common Stock
Conversion of redeemable convertible preferred stock to common stock
Common Class B
Common Stock
Conversion of convertible notes with related parties to common stock
Common Class B
Common Stock
Conversion of Class B stock to Class A stock
Beginning balance (in shares) at Dec. 31, 2019                           2,271,000 6,031,000            
Beginning balance at Dec. 31, 2019                           $ 83,375 $ 49,598            
Redeemable Convertible Preferred Stock                                          
Accretion of redeemable convertible preferred stock                           $ 920 $ 35            
Ending balance (in shares) at Mar. 31, 2020                           2,271,000 6,031,000            
Ending balance at Mar. 31, 2020                           $ 84,295 $ 49,633            
Beginning balance (in shares) at Dec. 31, 2019             (195,000)                 0   79,583,000      
Beginning balance at Dec. 31, 2019 $ (122,311)       $ 0   $ (644) $ 35,339     $ 426 $ (157,006) $ (426)     $ 0   $ 0      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                          
Accretion of redeemable convertible preferred stock (955)             (955)                          
Issuance of common stock upon exercise of options (in shares)           572,000                              
Issuance of common stock upon exercise of options 305             305                          
Stock-based compensation 1,994             1,994                          
Capital contribution (in shares)           (213,000)                              
Net income (loss) (11,082)                     (11,082)                  
Ending balance at Mar. 31, 2020 (132,049)           $ (644) 37,109       (168,514)       $ 0   $ 0      
Ending balance (in shares) at Mar. 31, 2020             (195,000)                 0   79,942,000      
Beginning balance (in shares) at Dec. 31, 2019                           2,271,000 6,031,000            
Beginning balance at Dec. 31, 2019                           $ 83,375 $ 49,598            
Ending balance (in shares) at Jun. 30, 2020                           2,271,000 6,031,000            
Ending balance at Jun. 30, 2020                           $ 85,216 $ 49,668            
Beginning balance (in shares) at Dec. 31, 2019             (195,000)                 0   79,583,000      
Beginning balance at Dec. 31, 2019 (122,311)       $ 0   $ (644) 35,339     $ 426 (157,006) $ (426)     $ 0   $ 0      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                          
Net income (loss) 10,241                                        
Ending balance at Jun. 30, 2020 (109,597)           $ (644) 38,238       (147,191)       $ 0   $ 0      
Ending balance (in shares) at Jun. 30, 2020             (195,000)                 0   80,401,000      
Beginning balance (in shares) at Mar. 31, 2020                           2,271,000 6,031,000            
Beginning balance at Mar. 31, 2020                           $ 84,295 $ 49,633            
Redeemable Convertible Preferred Stock                                          
Accretion of redeemable convertible preferred stock                           $ 921 $ 35            
Ending balance (in shares) at Jun. 30, 2020                           2,271,000 6,031,000            
Ending balance at Jun. 30, 2020                           $ 85,216 $ 49,668            
Beginning balance (in shares) at Mar. 31, 2020             (195,000)                 0   79,942,000      
Beginning balance at Mar. 31, 2020 (132,049)           $ (644) 37,109       (168,514)       $ 0   $ 0      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                          
Accretion of redeemable convertible preferred stock (956)             (956)                          
Issuance of common stock upon exercise of options (in shares)           672,000                              
Issuance of common stock upon exercise of options 699             699                          
Stock-based compensation 1,386             1,386                          
Capital contribution (in shares)           (213,000)                              
Net income (loss) 21,323                     21,323                  
Ending balance at Jun. 30, 2020 (109,597)           $ (644) 38,238       (147,191)       $ 0   $ 0      
Ending balance (in shares) at Jun. 30, 2020             (195,000)                 0   80,401,000      
Beginning balance (in shares) at Dec. 31, 2020                           2,271,000 6,031,000            
Beginning balance at Dec. 31, 2020 136,856                         $ 87,118 $ 49,738            
Redeemable Convertible Preferred Stock                                          
Accretion of redeemable convertible preferred stock                           $ 961 $ 36            
Ending balance (in shares) at Mar. 31, 2021                           2,271,000 6,031,000            
Ending balance at Mar. 31, 2021                           $ 88,079 $ 49,774            
Beginning balance (in shares) at Dec. 31, 2020             (195,000)                 0   78,283,000      
Beginning balance at Dec. 31, 2020 (50,296)           $ (644) 21,732       (71,384)       $ 0   $ 0      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                          
Accretion of redeemable convertible preferred stock (997)             (997)                          
Issuance of common stock upon exercise of options (in shares)                                   1,965,000      
Issuance of common stock upon exercise of options 3,660             3,660                          
Repurchase and retirement of common stock (in shares)                                   (50,000)      
Repurchase and retirement of common stock (450)             (450)                          
Stock-based compensation 1,290             1,290                          
Net income (loss) 13,398                     13,398                  
Ending balance at Mar. 31, 2021 (33,395)           $ (644) 25,235       (57,986)       $ 0   $ 0      
Ending balance (in shares) at Mar. 31, 2021             (195,000)                 0   80,198,000      
Beginning balance (in shares) at Dec. 31, 2020                           2,271,000 6,031,000            
Beginning balance at Dec. 31, 2020 136,856                         $ 87,118 $ 49,738            
Ending balance (in shares) at Jun. 30, 2021                           0 0            
Ending balance at Jun. 30, 2021 0                         $ 0 $ 0            
Beginning balance (in shares) at Dec. 31, 2020             (195,000)                 0   78,283,000      
Beginning balance at Dec. 31, 2020 $ (50,296)           $ (644) 21,732       (71,384)       $ 0   $ 0      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                          
Issuance of common stock upon exercise of options (in shares) 115,000                                        
Net income (loss) $ (39,449)                                        
Ending balance at Jun. 30, 2021 148,902           $ (644) 260,378       (110,833)       $ 1   $ 0      
Ending balance (in shares) at Jun. 30, 2021             (195,000)                 82,714,000   32,231,000      
Beginning balance (in shares) at Mar. 31, 2021                           2,271,000 6,031,000            
Beginning balance at Mar. 31, 2021                           $ 88,079 $ 49,774            
Redeemable Convertible Preferred Stock                                          
Accretion of redeemable convertible preferred stock                           $ 466 $ 17            
Conversion of redeemable convertible preferred stock to common stock (in shares)                           (2,271,000) (6,031,000)            
Conversion of redeemable convertible preferred stock to common stock                           $ (88,545) $ (49,791)            
Ending balance (in shares) at Jun. 30, 2021                           0 0            
Ending balance at Jun. 30, 2021 0                         $ 0 $ 0            
Beginning balance (in shares) at Mar. 31, 2021             (195,000)                 0   80,198,000      
Beginning balance at Mar. 31, 2021 (33,395)           $ (644) 25,235       (57,986)       $ 0   $ 0      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                          
Accretion of redeemable convertible preferred stock (483)             (483)                          
Conversion of shares (in shares)                                 82,714,000   24,202,000 3,085,000 (82,714,000)
Conversion of shares   $ 138,336 $ 25,653 $ 0         $ 138,335 $ 25,653             $ 1   $ 1   $ (1)
Issuance of common stock upon exercise of options (in shares)                                   5,282,000      
Issuance of common stock upon exercise of options 8,720             8,720                          
Repurchase and retirement of common stock (in shares)                                   (100,000)      
Repurchase and retirement of common stock (2,300)             (2,300)                          
Vesting of early exercised stock options 97             97                          
Issuance of common stock upon the vesting and settlement of restricted stock units (in shares)                                   2,278,000      
Stock-based compensation 65,121             65,121                          
Net income (loss) (52,847)                     (52,847)                  
Ending balance at Jun. 30, 2021 $ 148,902           $ (644) $ 260,378       $ (110,833)       $ 1   $ 0      
Ending balance (in shares) at Jun. 30, 2021             (195,000)                 82,714,000   32,231,000