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Share-Based Compensation (Summary of Stock Option Activity) (Details)
3 Months Ended
Jun. 30, 2020
shares
Number of Options  
Beginning balance (in shares) 7,723,302
Granted (in shares) 1,571,323
Exercised (in shares) (302,076)
Forfeited (in shares) (344,471)
Ending balance (in shares) 8,648,078
Options vested and expected to vest (in shares) 8,648,078
Options exercisable (in shares) 3,236,128