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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Mar. 31, 2020
Equity [Abstract] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | The following table summarizes stock-based compensation expense (in thousands):
| Years Ended March 31,
| 2020 |  | 2019 |  | 2018
Cost of service revenue | $ | 5,330 |  |  | $ | 3,752 |  |  | $ | 2,636 |
Cost of other revenue | 3,051 |  |  | 1,775 |  |  | 1,341 |
Research and development | 19,712 |  |  | 12,313 |  |  | 6,625 |
Sales and marketing | 20,205 |  |  | 11,951 |  |  | 6,630 |
General and administrative | 22,580 |  |  | 14,717 |  |  | 11,944 |
Total | $ | 70,878 |  |  | $ | 44,508 |  |  | $ | 29,176 |
Disclosure Of Share-Based Compensation Arrangements By Share-Based Payment Award | Stock option activities under all the Company's stock option plans during the years ended March 31, 2020, 2019 and 2018 are summarized as follows:
| Number of Shares |  | Weighted Average Exercise Price Per Share
Outstanding at March 31, 2017 | 4,462,412 |  |  | 7.52 |
Granted | 609,135 |  |  | 14.95 |
Exercised | (773,897 | ) |  | 3.95 |
Canceled/Forfeited | (299,365 | ) |  | 13.05 |
Outstanding at March 31, 2018 | 3,998,285 |  |  | 8.93 |
Granted | 236,799 |  |  | 21.65 |
Exercised | (759,884 | ) |  | 7.70 |
Canceled/Forfeited | (361,129 | ) |  | 15.41 |
Outstanding at March 31, 2019 | 3,114,071 |  |  | 9.45 |
Granted | — |  |  | — |
Exercised | (785,281 | ) |  | 8.77 |
Canceled/Forfeited | (54,527 | ) |  | 17.01 |
Outstanding at March 31, 2020 | 2,274,263 |  |  | 9.50 |
Vested and expected to vest March 31, 2020 | 2,255,616 |  |  | 9.42 |
Exercisable at March 31, 2020 | 2,115,696 |  |  |  |
Stock purchase right activities during the years ended March 31, 2020, 2019 and 2018 are summarized as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Term (in Years)
Balance at March 31, 2017 | 11,370 |  |  | $ | 8.10 |  |  | 1.09
Granted | — |  |  | — |  |  |
Vested and released | (6,395 | ) |  | 8.26 |  |  |
Forfeited | — |  |  | — |  |  |
Balance at March 31, 2018 | 4,975 |  |  | 8.10 |  |  | 1.09
Granted | — |  |  | — |  |  |
Vested and released | (4,625 | ) |  | 7.88 |  |  |
Forfeited | (350 | ) |  | 7.88 |  |  |
Balance at March 31, 2019 and 2020 | — |  |  | — |  |  | 0.00
Activities related to PSUs and RSUs during the years ended March 31, 2020, 2019 and 2018 are summarized as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Term (in Years)
Balance at March 31, 2017 | 4,939,050 |  |  | $ | 11.57 |  |  | 1.55
Granted | 3,481,870 |  |  | 14.41 |  |  |
Vested and released | (1,833,038 | ) |  | 10.27 |  |  |
Forfeited | (652,339 | ) |  | 12.73 |  |  |
Balance at March 31, 2018 | 5,935,543 |  |  | 13.51 |  |  | 1.60
Granted | 5,726,787 |  |  | 19.77 |  |  |
Vested and released | (2,399,371 | ) |  | 12.87 |  |  |
Forfeited | (1,442,471 | ) |  | 16.85 |  |  |
Balance at March 31, 2019 | 7,820,488 |  |  | 17.68 |  |  | 1.35
Granted | 6,431,505 |  |  | 20.62 |  |  |
Vested and released | (3,443,335 | ) |  | 17.02 |  |  |
Forfeited | (1,617,343 | ) |  | 19.06 |  |  |
Balance at March 31, 2020 | 9,191,315 |  |  |  |  |  | 1.89
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,
| 2020 |  | 2019 |  | 2018
Expected volatility | —% |  | 41% |  | 41%
Expected dividend yield | — |  | — |  | —
Risk-free interest rate | 0 |  | 2.5% to 3.0% |  | 1.8% to 2.4%
Weighted average expected term (in years) | N/A |  | 4.5 years |  | 4.8 years
Weighted average fair value of options granted | $— |  | $8.19 |  | $5.70
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,
| 2020 |  | 2019 |  | 2018
Expected volatility | 32% |  | 41% |  | 40%
Expected dividend yield | — |  | — |  | —
Risk-free interest rate | 1.79% |  | 2.43% |  | 1.33%
Weighted average expected term (in years) | 0.7 years |  | 0.8 years |  | 0.8 years
Weighted average fair value of rights granted | $5.66 |  | $5.74 |  | $4.10

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