XML 44 R31.htm IDEA: XBRL DOCUMENT
v3.24.2

EMPLOYEE STOCK PLANS (Tables) | 12 Months Ended
--- | ---
May 31, 2024
EMPLOYEE STOCK PLANS |
Compensation costs related to the Company's stock-based compensation |
|  | Year Ended May 31, |
(In thousands, except per share data) |  | 2024 |  |  | 2023 |  |  | 2022 |
Cost of sales |  | $ | 330 |  |  | $ | 331 |  |  | $ | 234 |
Research and development |  |  | 639 |  |  |  | 706 |  |  |  | 968 |
Selling, general and administrative |  |  | 1,549 |  |  |  | 1,711 |  |  |  | 1,721 |
Net effect on net income |  | $ | 2,518 |  |  | $ | 2,748 |  |  | $ | 2,923 |
Effect on earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.09 |  |  | $ | 0.10 |  |  | $ | 0.11 |
Diluted |  | $ | 0.09 |  |  | $ | 0.09 |  |  | $ | 0.11 |
Stock option and RSU transactions |
(in thousands) |  | Available Shares for Grant |
Balance, May 31, 2021 |  |  | 573 |
Additional shares reserved under the 2016 Plan |  |  | 1,414 |
Options granted |  |  | (303 | )
RSUs granted |  |  | (1,044 | )
RSUs cancelled |  |  | 20 |
Shares withheld for taxes and not issued |  |  | (30 | )
Options terminated |  |  | 105 |
Balance, May 31, 2022 |  |  | 735 |
Options granted |  |  | (110 | )
RSUs granted |  |  | (674 | )
RSUs cancelled |  |  | 60 |
Options terminated |  |  | 16 |
Balance, May 31, 2023 |  |  | 27 |
Shares reserved under the 2023 Plan |  |  | 1,500 |
Shares retired under the 2016 Plan |  |  | (95 | )
Options granted |  |  | (4 | )
RSUs granted |  |  | (221 | )
RSUs cancelled |  |  | 144 |
Options terminated |  |  | 12 |
Balance, May 31, 2024 |  |  | 1,363 |
Stock option transactions |
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term |  |  | Aggregated Intrinsic Value |
|  | (in thousands) |  |  | Per Share |  |  | (In Years) |  |  | (in thousands) |
Balances, May 31, 2023 |  |  | 961 |  |  | $ | 3.67 |  |  |  | 4.02 |  |  | $ | 28,211 |
Options granted |  |  | 4 |  |  |  | 49.21 |  |  |  |  |  |  |  |  |
Options terminated |  |  | (12 | ) |  |  | 3.78 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (251 | ) |  |  | 2.51 |  |  |  |  |  |  |  |  |
Balances, May 31, 2024 |  |  | 702 |  |  | $ | 4.37 |  |  |  | 3.26 |  |  | $ | 5,322 |
Options exercisable, May 31, 2024 |  |  | 536 |  |  | $ | 3.26 |  |  |  | 2.83 |  |  | $ | 4,512 |
Options exercisable and expected to vest |  |  | 701 |  |  | $ | 4.37 |  |  |  | 3.26 |  |  | $ | 5,320 |
RSUs, PRSUs, restricted shares and performance restricted shares granted |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Weighted Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value |
|  | (in thousands) |  |  | Per Share |  |  | (In Years) |  |  | (in thousands) |
Unvested, May 31, 2023 |  |  | 345 |  |  | $ | 6.40 |  |  |  | 2.35 |  |  | $ | 11,392 |
Granted (1) |  |  | 205 |  |  |  | 31.36 |  |  |  |  |  |  |  |  |
Vested |  |  | (170 | ) |  |  | 9.31 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (86 | ) |  |  | 13.63 |  |  |  |  |  |  |  |  |
Unvested, May 31, 2024 |  |  | 294 |  |  | $ | 20.08 |  |  |  | 2.29 |  |  | $ | 3,381 |
Fair value assumptions for Option Valuation Model |
|  | Year Ended May 31, |
|  | 2024 |  |  | 2023 |  |  | 2022 |
Expected term (in years) |  |  | 5 |  |  | 5-6 |  |  | 5-6 |
Volatility |  |  | 93 | % |  |  | 86 | % |  |  | 88 | %
Risk-free interest rates |  |  | 4.34 | % |  |  | 3.12 | % |  |  | 1.50 | %
Weighted average grant date fair value |  | $ | 36.02 |  |  | $ | 6.29 |  |  | $ | 4.01 |
Fair value assumption of the ESPP Purchase Rights |
|  | Year Ended May 31, |
|  | 2024 |  |  | 2023 |  |  | 2022 |
Expected term (in years) |  | 0.5 – 2.0 |  |  | 0.5 – 2.0 |  |  | 0.5 – 2.0 |
Volatility |  | 70% – 94 | % |  | 91% – 203 | % |  | 101% – 272 | %
Risk-free interest rates |  | 4.72%–5.53 | % |  | 3.97%–4.94 | % |  | 0.05%–2.44 | %
Weighted average grant date fair value |  | $ | 6.30 |  |  | $ | 13.60 |  |  | $ | 9.68 |

X
- References No definition available. + Details
Name: | aehr_ScheduleOfRestrictedSharesAndPerformanceRestrictedSharesGrantedTableTextBlock
Namespace Prefix: | aehr_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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 -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardEmployeeStockPurchasePlanValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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 -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration