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Net Income Per Share - Schedule of computation of basic and diluted earnings per share of common stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Basic earnings per share:                
Net income $ 30,005 $ 49,126 $ 49,418 $ 45,211 $ 34,879 $ 13,040 $ 128,549 $ 93,130
Shares used in computation:                
Weighted-average common shares outstanding, basic (in shares) 208,988,168     208,116,104     208,169,736 208,116,104
Earnings per share, basic (in dollars per share) $ 0.14     $ 0.22     $ 0.62 $ 0.45
Diluted earnings per share:                
Net income $ 30,005 $ 49,126 $ 49,418 $ 45,211 $ 34,879 $ 13,040 $ 128,549 $ 93,130
Shares used in computation:                
Weighted-average common shares outstanding, basic (in shares) 208,988,168     208,116,104     208,169,736 208,116,104
Weighted-average effect of potentially dilutive securities:                
Unvested common stock subject to forfeiture (in shares) 12,326,206     0     8,572,134 0
Underwriters' option to purchase additional shares (in shares) 0     0     25,132 0
Diluted weighted-average common shares outstanding (in shares) 224,331,039     208,116,104     218,491,114 208,116,104
Diluted net income per share (in dollars per share) $ 0.13     $ 0.22     $ 0.59 $ 0.45
Employee stock options                
Weighted-average effect of potentially dilutive securities:                
Employee stock options / Restricted stock units (in shares) 1,290,101     0     732,824 0
Restricted stock units                
Weighted-average effect of potentially dilutive securities:                
Employee stock options / Restricted stock units (in shares) 1,726,564     0     991,288 0