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STOCK-BASED COMPENSATION AND STOCKHOLDERS' EQUITY (Tables)
 12 Months Ended
Mar. 31, 2022
Equity [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs The following table presents stock-based compensation expense:
 Years Ended March 31,
 202220212020
Cost of service revenue$8,815 $8,811 $5,330 
Cost of other revenue4,717 4,384 3,051 
Research and development32,655 31,641 19,712 
Sales and marketing47,202 33,869 20,205 
General and administrative39,942 28,933 22,580 
Total$133,331 $107,638 $70,878 
Disclosure of Share-Based Compensation Arrangements By Share-Based Payment Award The following table presents the stock option activity during the years ended March 31, 2022, 2021, and 2020 (shares in thousands):
Number of
Shares		Weighted Average Exercise Price Per Share
Outstanding at March 31, 20193,114 $9.45 
Granted — — 
Exercised(785)8.77 
Canceled/Forfeited(55)17.01 
Outstanding at March 31, 20202,274 9.50 
Exercised(426)8.67 
Canceled/Forfeited(35)22.05 
Outstanding at March 31, 20211,813 9.46 
Exercised(915)7.89 
Canceled/Forfeited(31)21.90 
Outstanding at March 31, 2022867 10.67 
Vested and expected to vest March 31, 2022867 10.67 
Exercisable at March 31, 2022861 $10.60 
The following table presents the RSU activity during the years ended March 31, 2022, 2021, and 2020 (shares in thousands):
Number of
Shares		Weighted
Average Grant
Date Fair Value		Weighted Average
Remaining Contractual
Term (in Years)
Balance at March 31, 20196,836 $17.45 2.38
Granted5,592 20.50 
Vested and released(2,771)16.87 
Forfeited(1,545)19.13 
Balance at March 31, 20208,112 19.43 1.96
Granted6,256 18.73 
Vested and released(4,579)18.90 
Forfeited(1,143)18.96 
Balance at March 31, 20218,646 19.27 1.85
Granted8,333 21.37 
Vested and released(5,146)19.82 
Forfeited(2,458)20.85 
Balance at March 31, 20229,375 $20.41 2.11
The following table presents the PSU activity during the years ended March 31, 2022, 2021, and 2020 (shares in thousands):
Number of
Shares		Weighted
Average Grant
Date Fair Value		Weighted Average
Remaining Contractual
Term (in Years)
Balance at March 31, 2019984 $19.23 1.39
Granted293 21.40 
Granted for performance achievement1
547 21.40 
Vested and released(673)17.61 
Forfeited(72)17.52 
Balance at March 31, 20201,079 22.05 1.40
Granted1,013 29.00 
Granted for performance achievement1
43 29.00 
Vested and released(350)19.05 
Forfeited(209)22.38 
Balance at March 31, 20211,576 27.33 1.24
Granted497 30.41 
Granted for performance achievement1
20 30.41 
Vested and released(250)17.15 
Forfeited(817)23.45 
Balance at March 31, 20221,026 35.36 0.89
1 Represents additional PSUs awarded as a result of the achievement of performance goals above the performance targets established at grant.
The PSUs granted were valued for compensation expense purposes at weighted average share price determined by the Monte Carlo simulations using volatility factors and risk-free rates as follows:

Year ended March 31,Value per Weighted Average ShareVolatility RangeRisk Free Interest Rate Range
2022$30.98 58.65%—59.67%0.34%—0.40%
2021$29.07 55.66%—60.68%0.15%—0.18%
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions
The estimated fair value of stock purchase rights granted under the Employee Stock Purchase Plan was estimated using the Black-Scholes pricing model with the following weighted-average assumptions:
 Years Ended March 31,
 202220212020
Expected volatility45%84%32%
Expected dividend yield———
Risk-free interest rate0.57%0.11%1.79%
Weighted average expected term (in years)0.8 years0.7 years0.7 years
Weighted average fair value of rights granted$5.81$8.00$5.66