Stock-Based Compensation (Tables)

3 Months Ended

Jun. 30, 2021

Share-based Payment Arrangement [Abstract]

The following table summarizes stock option activity:


	Number of Shares	Weighted-Average Exercise Price (per share)		Weighted-Average Remaining Contractual Life (in years)	Aggregate Intrinsic Value (in thousands)
Options outstanding as of March 31, 2021	8,146,445	$	4.01	6.86	$	622,249
Granted	415,185	73.45
Forfeited / Cancelled	(121,187)	5.40
Exercised	(178,127)	3.90
Options outstanding as of June 30, 2021	8,262,316	$	7.48	6.77	$	567,952
Vested and expected to vest (net of estimated forfeitures) at June 30, 2021	8,117,035	$	7.18	6.73	$	560,286
Exercisable as of June 30, 2021	5,748,775	$	2.84	5.89	$	420,873

At June 30, 2021 and 2020, total unrecognized stock-based compensation expense related to unvested stock options, net of estimated forfeitures, was $23,621 and $7,658, respectively, with expected remaining weighted-average recognition periods of 2.52 years and 2.42 years, respectively.

Summary of RSU Activity

The following table summarizes restricted stock unit ("RSU") and restricted stock award ("RSA") activity:


	Number of Shares	Weighted-Average Grant Date Fair Value
Unvested restricted shares outstanding as of March 31, 2021	333,544	$	4.55
Granted	279,303	42.43
Vested	(276,010)	2.51
Cancelled	(3,526)	13.88
Unvested restricted shares outstanding as of June 30, 2021	333,311	$	37.88

At June 30, 2021 and 2020, total unrecognized stock-based compensation expense related to RSUs and RSAs was $11,400 and $1,101, respectively, with expected remaining weighted-average recognition periods of 2.74 years and 2.37 years, respectively.