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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Mar. 31, 2019
Equity [Abstract] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | The following table summarizes stock-based compensation expense (as reclassified, see Note 14, in thousands):
| Years Ended March 31,
| 2019 |  | 2018 |  | 2017
Cost of service revenue | $ | 5,527 |  |  | $ | 3,977 |  |  | $ | 3,308 |
Cost of product revenue | — |  |  | — |  |  | — |
Research and development | 12,313 |  |  | 6,625 |  |  | 3,762 |
Sales and marketing | 11,951 |  |  | 6,630 |  |  | 5,334 |
General and administrative | 14,717 |  |  | 11,944 |  |  | 9,058 |
Total | $ | 44,508 |  |  | $ | 29,176 |  |  | $ | 21,462 |
Disclosure Of Share-Based Compensation Arrangements By Share-Based Payment Award | Stock option activity under all the Company's stock option plans since March 31, 2016, is summarized as follows:
| Number of Shares |  | Weighted Average Exercise Price Per Share
Outstanding at March 31, 2016 | 4,793,266 |  |  | $ | 6.29 |
Granted | 407,392 |  |  | 14.63 |
Exercised | (603,998 | ) |  | 2.34 |
Canceled/Forfeited | (134,248 | ) |  | 8.41 |
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 |
Vested and expected to vest March 31, 2019 | 3,114,071 |  |  | $ | 9.45 |
Exercisable at March 31, 2019 | 2,737,032 |  |  | $ | 8.33 |
Stock Purchase Right activity since March 31, 2016 is summarized as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Term (in Years)
Balance at March 31, 2016 | 82,171 |  |  | $ | 6.30 |  |  | 0.76
Granted | — |  |  | — |  |  |
Vested and released | (69,426 | ) |  | 6.00 |  |  |
Forfeited | (1,375 | ) |  | 6.72 |  |  |
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 | — |  |  | $ | — |  |  |
Restricted stock unit activity since March 31, 2016 is summarized as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Term (in Years)
Balance at March 31, 2016 | 4,544,799 |  |  | $ | 8.08 |  |  | 1.67
Granted | 2,491,877 |  |  | 15.15 |  |  |
Vested and released | (1,600,831 | ) |  | 7.89 |  |  |
Forfeited | (496,795 | ) |  | 9.56 |  |  |
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
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,
| 2019 |  | 2018 |  | 2017
Expected volatility | 41 | % |  | 41 | % |  | 44 | %
Expected dividend yield | — |  |  | — |  |  | — |
Risk-free interest rate | 2.5% to 3.0% |  |  | 1.8% to 2.4% |  |  | 1.1% to 2.2% |
Weighted average expected term (in years) | 4.5 years |  |  | 4.8 years |  |  | 4.9 years |
Weighted average fair value of options granted | $ | 8.19 |  |  | $ | 5.70 |  |  | $ | 5.74 |
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions |
| Years Ended March 31,
| 2019 |  | 2018 |  | 2017
Expected volatility | 41 | % |  | 41 | % |  | 44 | %
Expected dividend yield | — |  |  | — |  |  | — |
Risk-free interest rate | 2.5% to 3.0% |  |  | 1.8% to 2.4% |  |  | 1.1% to 2.2% |
Weighted average expected term (in years) | 4.5 years |  |  | 4.8 years |  |  | 4.9 years |
Weighted average fair value of options granted | $ | 8.19 |  |  | $ | 5.70 |  |  | $ | 5.74 |
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,
| 2019 |  | 2018 |  | 2017
Expected volatility | 41 | % |  | 40 | % |  | 37 | %
Expected dividend yield | — |  |  | — |  |  | — |
Risk-free interest rate | 2.43 | % |  | 1.33 | % |  | 0.65 | %
Weighted average expected term (in years) | 0.8 years |  |  | 0.8 years |  |  | 0.8 years |
Weighted average fair value of rights granted | $ | 5.74 |  |  | $ | 4.10 |  |  | $ | 4.19 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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