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Employee Benefits and Share-Based Compensation - Summary of Restricted Stock Award Activity (Details) - RSAs - 2009 Plan
shares in Thousands
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Number of Shares  
Outstanding at beginning of period (in shares) | shares 21
Granted (Awarded) (in shares) | shares 11
Vested (Released) (in shares) | shares (21)
Outstanding and unvested at end of period (in shares) | shares 11
Weighted-Average Grant Date Fair Value  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 68.11
Granted (Awarded) (in dollars per share) | $ / shares 137.36
Vested (Released) (in dollars per share) | $ / shares 68.11
Outstanding and unvested at end of period (in dollars per share) | $ / shares $ 137.36