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Intangible Assets (Tables) | 9 Months Ended
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Jan. 31, 2021
Intangible Assets Gross Excluding Goodwill [Abstract] |
Summary of Intangible Assets | The following table presents a summary of intangible assets as of January 31, 2021 and April 30, 2020 (in thousands):
|  | January 31, 2021 |  |  | April 30, 2020 |
|  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |
|  | Carrying |  |  | Accumulated |  |  | Net Carrying |  |  | Carrying |  |  | Accumulated |  |  | Net Carrying |
|  | Amount |  |  | Amortization |  |  | Amount |  |  | Amount |  |  | Amortization |  |  | Amount |
Customer relationships |  | $ | 2,580 |  |  | $ | (2,041 | ) |  | $ | 539 |  |  | $ | 2,580 |  |  | $ | (1,932 | ) |  | $ | 648 |
Developed technology |  |  | 200 |  |  |  | (194 | ) |  |  | 6 |  |  |  | 200 |  |  |  | (176 | ) |  |  | 24 |
Patents, trademarks, and trade names |  |  | 8,242 |  |  |  | (5,367 | ) |  |  | 2,875 |  |  |  | 8,140 |  |  |  | (5,091 | ) |  |  | 3,049 |
|  |  | 11,022 |  |  |  | (7,602 | ) |  |  | 3,420 |  |  |  | 10,920 |  |  |  | (7,199 | ) |  |  | 3,721 |
Patents in progress |  |  | 1,016 |  |  |  | — |  |  |  | 1,016 |  |  |  | 654 |  |  |  | — |  |  |  | 654 |
Total definite-lived intangible assets |  | $ | 12,038 |  |  | $ | (7,602 | ) |  | $ | 4,436 |  |  | $ | 11,574 |  |  | $ | (7,199 | ) |  | $ | 4,375 |
Schedule of Future Expected Amortization Expense | Estimated amortization expense of intangible assets for the remainder of fiscal 2021 and succeeding fiscal years is as follows (in thousands):
Fiscal |  | Amount |
2021 |  | $ | 134 |
2022 |  |  | 495 |
2023 |  |  | 454 |
2024 |  |  | 445 |
2025 |  |  | 434 |
Thereafter |  |  | 1,458 |
Total |  | $ | 3,420 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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