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Stockholders' Equity (Tables) | 12 Months Ended
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May 31, 2018
Equity [Abstract] |
Schedule summarizes stock option activity | The following table summarizes information about stock option activity for the fiscal year ended May 31, 2018:
| Shares |  | Weighted- average exercise price |  | Weighted average remaining contractual life |  | Aggregate intrinsic value (in thousands)
Outstanding at beginning of year - June 1, 2017 | 1,667,443 |  |  | $ | 15.01 |  |  |  |  |
Granted | 518,498 |  |  | $ | 16.78 |  |  |  |  |
Exercised | (271,344 | ) |  | $ | 14.83 |  |  |  |  |
Forfeited | (204,184 | ) |  | $ | 16.24 |  |  |  |  |
Expired | (14,000 | ) |  | $ | 15.75 |  |  |  |  |
Outstanding at end of year - May 31, 2018 | 1,696,413 |  |  | $ | 15.42 |  |  | 5.58 |  | $ | 9,520 |
Options exercisable at year-end | 652,543 |  |  | $ | 14.41 |  |  | 3.48 |  | $ | 4,321 |
Options expected to vest in future periods | 1,043,870 |  |  | $ | 16.05 |  |  | 6.90 |  | $ | 5,199 |
Share based compensation arrangement by share based payment award nonvested shares and weighted average grant date fair value | The following table summarizes information about performance unit award activity for the year ended May 31, 2018:
| Performance Unit Awards |  | Weighted Average Grant-Date Fair Value
Non-vested at beginning of year, June 1, 2017 | 361,164 |  |  | $ | 18.54 |
Granted | 135,135 |  |  | $ | 23.83 |
Vested | — |  |  | $ | — |
Canceled | (44,443 | ) |  | $ | 22.76 |
Non-vested at end of year, May 31, 2018 | 451,856 |  |  | $ | 19.75 |
The following table summarizes information about restricted stock unit activity for the year ended May 31, 2018:
| Restricted Stock Units |  | Weighted Average Grant-Date Fair Value
Non-vested at beginning of year, June 1, 2017 | 439,297 |  |  | $ | 15.55 |
Granted | 299,392 |  |  | $ | 16.60 |
Vested | (158,756 | ) |  | $ | 16.83 |
Canceled | (105,431 | ) |  | $ | 18.25 |
Non-vested at end of year, May 31, 2018 | 474,502 |  |  | $ | 16.23 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | The following tables represents the break out of share-based compensation included in the Company's consolidated statement of operations:
|  | Year ended May 31,
(in thousands) |  | 2018 |  | 2017 |  | 2016
Cost of sales |  | $ | 119 |  |  | $ | 299 |  |  | $ | 172 |
Research and development |  | 554 |  |  | 314 |  |  | 349 |
Sales and marketing |  | 1,778 |  |  | 1,762 |  |  | 1,489 |
General and administrative |  | 5,461 |  |  | 4,026 |  |  | 2,291 |
Acquisition, restructuring and other items, net |  | — |  |  | (218 | ) |  | (1,061 | )
|  | $ | 7,912 |  |  | $ | 6,183 |  |  | $ | 3,240 |

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- Definition Tabular disclosure for stock option 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 (d) -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 (e) -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 (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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