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Share-Based Compensation (Tables)
 9 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Activity
A summary of stock option activity under the Company’s Equity Plans are as follows:
Number of Options
Options outstanding at March 31, 20207,723,302 
Granted
1,679,338 
Exercised
(729,024)
Forfeited
(452,419)
Options outstanding at December 31, 20208,221,197 
Options vested and expected to vest at December 31, 20208,221,197 
Options exercisable at December 31, 20204,456,746 
Summary of Restricted Share Awards and Restricted Stock Units Activity
A summary of restricted stock award and restricted stock unit activity under the Company’s Equity Plans are as follows:
Number of Shares
Unvested balance at March 31, 20201,280,312 
Granted2,947,939 
Vested(246,305)
Forfeited(326,357)
Unvested balance at December 31, 20203,655,589 
Share-based Payment Arrangement, Performance Shares, Activity
A summary of performance stock unit activity under the Company’s Equity Plans are as follows:
Number of Shares
Unvested balance at March 31, 2020299,870 
Granted568,976 
Vested(131,227)
Forfeited(37,415)
Unvested balance at December 31, 2020700,204 
Schedule of Share-based Compensation
Share-based compensation expense was as follows (in thousands):
Three Months Ended December 31,Nine Months Ended December 31,
2020201920202019
Share-based compensation expense recognized as:
R&D expenses$3,311 $5,399 $11,060 $11,565 
SG&A expenses3,699 14,396 10,686 22,613 
Total$7,010 $19,795 $21,746 $34,178