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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | Jan. 31, 2021 | Apr. 30, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | $ 12,038 | $ 11,574
Total definite-lived intangible assets, Accumulated Amortization | (7,602) | (7,199)
Total definite-lived intangible assets, Net Carrying Amount | 4,436 | 4,375
Total Intangible assets, Net Carrying Amount | 4,436 | 4,375
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 2,580 | 2,580
Total definite-lived intangible assets, Accumulated Amortization | (2,041) | (1,932)
Total definite-lived intangible assets, Net Carrying Amount | 539 | 648
Developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 200 | 200
Total definite-lived intangible assets, Accumulated Amortization | (194) | (176)
Total definite-lived intangible assets, Net Carrying Amount | 6 | 24
Patents, trademarks, and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 8,242 | 8,140
Total definite-lived intangible assets, Accumulated Amortization | (5,367) | (5,091)
Total definite-lived intangible assets, Net Carrying Amount | 2,875 | 3,049
Definite-lived intangible assets excluding patents in progress |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 11,022 | 10,920
Total definite-lived intangible assets, Accumulated Amortization | (7,602) | (7,199)
Total definite-lived intangible assets, Net Carrying Amount | 3,420 | 3,721
Patents in progress |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 1,016 | 654
Total definite-lived intangible assets, Net Carrying Amount | $ 1,016 | $ 654

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + 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)(1),(b)) -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 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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