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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Stock Option Expense and Activity | The following tables summarize information pertaining to the stock-based compensation expense from stock options and stock awards (in thousands, except weighted-average grant-date fair value and recognition period):
|  | Three Months Ended December 31, |  | Nine Months Ended December 31,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Cost of service revenue |  | $ | 680 |  |  | $ | 455 |  |  | $ | 1,775 |  |  | $ | 1,319 |
Research and development |  | 3,570 |  |  | 1,794 |  |  | 8,587 |  |  | 4,445 |
Sales and marketing |  | 5,590 |  |  | 3,362 |  |  | 13,262 |  |  | 8,577 |
General and administrative |  | 2,695 |  |  | 2,519 |  |  | 7,950 |  |  | 6,797 |
Total |  | $ | 12,535 |  |  | $ | 8,130 |  |  | $ | 31,574 |  |  | $ | 21,138 |
|  | Nine Months Ended December 31,
|  | 2018 |  | 2017
Stock options outstanding at the beginning of the period: |  | 3,998 |  |  | 4,462 |
Options granted |  | 222 |  |  | 427 |
Options exercised |  | (641 | ) |  | (421 | )
Options canceled and forfeited |  | (192 | ) |  | (176 | )
Options outstanding at the end of the period: |  | 3,387 |  |  | 4,292 |
Weighted-average fair value of grants during the period |  | $ | 8.27 |  |  | $ | 5.30 |
Total intrinsic value of options exercised during the period |  | $ | 9,148 |  |  | $ | 4,312 |
Weighted-average remaining recognition period at period-end (in years) |  | 2.53 |  |  | 2.14 |
Stock awards outstanding at the beginning of the period: |  | 5,939 |  |  | 4,950 |
Stock awards granted |  | 4,993 |  |  | 2,884 |
Stock awards vested |  | (2,123 | ) |  | (1,615 | )
Stock awards canceled and forfeited |  | (700 | ) |  | (447 | )
Stock awards outstanding at the end of the period: |  | 8,109 |  |  | 5,772 |
Weighted-average fair value of grants during the period |  | $ | 20.05 |  |  | $ | 13.89 |
Weighted-average remaining recognition period at period-end (in years) |  | 2.4 |  |  | 2.67 |
Total unrecognized compensation expense at period-end |  | $ | 112,970 |  |  | $ | 64,625 |

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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (e) -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 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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