STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Jun. 30, 2021

Share-based Payment Arrangement [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The following table presents stock-based compensation expense:

	Three Months Ended June 30,
	2021		2020
Cost of service revenue	$	1,968	$	1,814
Cost of other revenue	1,071		787
Research and development	8,698		6,545
Sales and marketing	14,326		5,739
General and administrative	10,524		7,894
Total	$	36,587	$	22,779

Schedule of Stock Option Activity

The following table presents stock option activity (shares in thousands):

	Number of Shares	Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at March 31, 2021	1,813	$	9.46	2.86 years	$	41,673
Granted	—	—
Exercised	(391)	9.04
Canceled/Forfeited	(9)	21.85
Outstanding at June 30, 2021	1,413	$	9.50	2.61 years	$	25,806
Vested and expected to vest at June 30, 2021	1,411	$	9.48	2.60 years	$	25,788
Exercisable at June 30, 2021	1,373	$	9.19	2.48 years	$	25,498

Schedule of Share-based Compensation Arrangements by Share-based Payment Award

The following table presents RSU activity (shares in thousands):

	Number of Shares	Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at March 31, 2021	8,646	$	19.27	1.85 years	$	280,467
Granted	3,466	26.36
Vested and released	(969)	20.07
Forfeited	(317)	19.71
Outstanding at June 30, 2021	10,826	$	21.45	2.05 years	$	300,524

The following table presents PSU activity (shares in thousands):

	Number of Shares	Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at March 31, 2021	1,576	$	27.33	1.24 years	$	51,116
Granted	465	27.92
Granted for performance achievement1	20	27.92
Vested and released	(206)	16.12
Forfeited	(198)	24.61
Outstanding at June 30, 2021	1,657	$	30.56	1.43 years	$	46,012

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following table presents the estimated fair value on the date of grant of each of the look-back features and the assumptions used in the Black-Scholes pricing model:

Fair value of look-back options	$4.64		-	$8.24
Valuation assumptions:
Expected volatility	58.7%
Risk-free interest rates	0.06	%	-	0.07%
Expected terms (in years)	0.38		-	1.21
Dividend rate	—%