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Net Income (Loss) Per Share - Schedule of Earnings Per Share - Diluted (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator:        
Net income (loss) attributable to Class A and Class B common stockholders $ (53,330) $ 15,622 $ (40,929) $ 6,387
Reallocation of net income attributable to participating securities 0 477 0 202
Interest on convertible notes with related parties, net of tax   11    
Net income (loss) attributable to Class A and Class B common stockholders, diluted $ (53,330) $ 16,110 $ (40,929) $ 6,589
Denominator:        
Weighted-average shares of common stock outstanding (in shares) 96,726 79,681 87,829 79,552
Effect of dilutive securities:        
Options to purchase common stock (in shares) 0 11,236 0 12,029
Convertible notes with related parties (in shares) 0 373 0 0
Weighted average shares of Class A and Class B common stock outstanding, diluted (in shares) 96,726 91,290 87,829 91,581
Net income (loss) per share attributable to Class A and Class B common stockholders - diluted (in dollars per share) $ (0.55) $ 0.18 $ (0.47) $ 0.07