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Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Granted, shares 0   0
Stock Options      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares outstanding, Beginning balance 20,762,000 21,528,000 21,528,000
Granted, shares 0 0  
Exercised, shares (2,609,000) (513,000)  
Expired / Cancelled / Forfeited, shares (222,000) (253,000)  
Shares outstanding, Ending Balance 17,931,000 20,762,000 17,931,000
Exercisable, Ending Balance 8,756,000   8,756,000
Weighted Average Exercise Prices, Beginning balance $ 6.24 $ 6.22 $ 6.22
Weighted Average Exercise Prices, granted 0 0  
Weighted Average Exercise Prices, Exercised 5.09 5.23  
Weighted Average Exercise Prices, Expired/ Cancelled/ Forfeited 7.71 6.07  
Weighted Average Exercise Prices, Ending balance 6.39 $ 6.24 6.39
Weighted Average Exercise Prices, Exercisable, Ending Balance $ 4.36   $ 4.36
Weighted average remaining contractual term, Outstanding 7 years 8 months 12 days 7 years 10 months 24 days  
Weighted average remaining contractual term, Exercisable 6 years 9 months 18 days    
Aggregate Intrinsic Value, Outstanding $ 531,079 $ 680,528 $ 531,079
Aggregate Intrinsic Value, Exercisable $ 277,143   $ 277,143