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STOCK-BASED COMPENSATION AND STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Mar. 31, 2021
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,
| 2021 |  | 2020 |  | 2019
Cost of service revenue | $ | 8,811 |  |  | $ | 5,330 |  |  | $ | 3,752 |
Cost of other revenue | 4,384 |  |  | 3,051 |  |  | 1,775 |
Research and development | 31,641 |  |  | 19,712 |  |  | 12,313 |
Sales and marketing | 33,869 |  |  | 20,205 |  |  | 11,951 |
General and administrative | 28,933 |  |  | 22,580 |  |  | 14,717 |
Total | $ | 107,638 |  |  | $ | 70,878 |  |  | $ | 44,508 |
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, 2021, 2020, and 2019 (shares in thousands):
| Number of Shares |  | Weighted Average Exercise Price Per Share
Outstanding at March 31, 2018 | 3,998 |  |  | $ | 8.93 |
Granted | 237 |  |  | 21.65 |
Exercised | (760) |  |  | 7.70 |
Canceled/Forfeited | (361) |  |  | 15.41 |
Outstanding at March 31, 2019 | 3,114 |  |  | 9.45 |
Exercised | (785) |  |  | 8.77 |
Canceled/Forfeited | (55) |  |  | 17.01 |
Outstanding at March 31, 2020 | 2,274 |  |  | 9.50 |
Exercised | (426) |  |  | 8.67 |
Canceled/Forfeited | (35) |  |  | 22.05 |
Outstanding at March 31, 2021 | 1,813 |  |  | 9.46 |
Vested and expected to vest March 31, 2021 | 1,809 |  |  | 9.43 |
Exercisable at March 31, 2021 | 1,751 |  |  | $ | 9.09 |
The following table presents the stock purchase rights' activity during the years ended March 31, 2021, 2020, and 2019 (shares in thousands):
| Number of Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Term (in Years)
Balance at March 31, 2018 | 4,975 |  |  | $ | 8.10 |  |  | 1.09
Vested and released | (4,625) |  |  | 7.88 |  |  |
Forfeited | (350) |  |  | 7.88 |  |  |
Balance at March 31, 2019, 2020, and 2021 | — |  |  | $ | — |  |  |
The following table presents the RSU activity during the years ended March 31, 2021, 2020, and 2019 (shares in thousands):
| Number of Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Term (in Years)
Balance at March 31, 2018 | 5,006 |  |  | $ | 13.05 |  |  |
Granted | 5,061 |  |  | 19.80 |  |  |
Vested and released | (1,899) |  |  | 12.69 |  |  |
Forfeited | (1,332) |  |  | 16.62 |  |  |
Balance at March 31, 2019 | 6,836 |  |  | 17.45 |  |  | 2.38
Granted | 5,592 |  |  | 20.50 |  |  |
Vested and released | (2,771) |  |  | 16.87 |  |  |
Forfeited | (1,545) |  |  | 19.13 |  |  |
Balance at March 31, 2020 | 8,112 |  |  | 19.43 |  |  | 1.96
Granted | 6,256 |  |  | 18.73 |  |  |
Vested and released | (4,579) |  |  | 18.90 |  |  |
Forfeited | (1,143) |  |  | 18.96 |  |  |
Balance at March 31, 2021 | 8,646 |  |  | $ | 19.27 |  |  | 1.85
The following table presents the PSU activity during the years ended March 31, 2021, 2020, and 2019 (shares in thousands):
| Number of Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Term (in Years)
Balance at March 31, 2018 | 924 |  |  | $ | 15.95 |  |  |
Granted | 474 |  |  | 19.52 |  |  |
Granted for performance achievement 1 | 192 |  |  | 19.52 |  |  |
Vested and released | (506) |  |  | 13.47 |  |  |
Forfeited | (100) |  |  | 19.94 |  |  |
Balance at March 31, 2019 | 984 |  |  | 19.23 |  |  | 1.39
Granted | 293 |  |  | 21.40 |  |  |
Granted for performance achievement 1 | 547 |  |  | 21.40 |  |  |
Vested and released | (673) |  |  | 17.61 |  |  |
Forfeited | (72) |  |  | 17.52 |  |  |
Balance at March 31, 2020 | 1,079 |  |  | 22.05 |  |  | 1.40
Granted | 1,013 |  |  | 29.00 |  |  |
Granted for performance achievement 1 | 43 |  |  | 29.00 |  |  |
Vested and released | (350) |  |  | 19.05 |  |  |
Forfeited | (209) |  |  | 22.38 |  |  |
Balance at March 31, 2021 | 1,576 |  |  | $ | 27.33 |  |  | 1.24
1 Represents additional PSUs awarded as a result of the achievement of performance goals above the performance targets established at grant.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The fair value of each of the Company's option grants has been estimated on the date of grant using the Black-Scholes pricing model with the following assumptions:
| Years Ended March 31,
| 2021 |  | 2020 |  | 2019
Expected volatility | —% |  | —% |  | 41%
Risk-free interest rate | — |  | — |  | 2.5% to 3.0%
Weighted average expected term (in years) | 0 |  | 0 |  | 4.5 years
Weighted average fair value of options granted | $— |  | $— |  | $8.19
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,
| 2021 |  | 2020 |  | 2019
Expected volatility | 84% |  | 32% |  | 41%
Expected dividend yield | — |  | — |  | —
Risk-free interest rate | 0.11% |  | 1.79% |  | 2.43%
Weighted average expected term (in years) | 0.7 years |  | 0.7 years |  | 0.8 years
Weighted average fair value of rights granted | $8.00 |  | $5.66 |  | $5.74

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