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Employee Equity-Based Compensation - Stock Option Activity (Details)
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Number of Shares  
Outstanding, beginning balance (shares) | shares 8,045,461
Granted (shares) | shares 489,804
Forfeited (shares) | shares (179,244)
Exercised (shares) | shares (337,393)
Expired (shares) | shares (77,752)
Outstanding, ending balance (shares) | shares 7,940,876
Weighted Average Exercise Price per Share  
Outstanding, beginning balance (usd per share) | $ / shares $ 14.18
Granted (usd per share) | $ / shares 7.09
Forfeited (usd per share) | $ / shares 13.73
Exercised (usd per share) | $ / shares 3.62
Expired (usd per share) | $ / shares 21.66
Outstanding, ending balance (usd per share) | $ / shares $ 14.13