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Property and Equipment - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2024 USD ($) | Jan. 31, 2023 USD ($) | Jan. 31, 2024 USD ($) asset | Jan. 31, 2023 USD ($) | Apr. 30, 2023 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |
Depreciation and amortization | $ 481,000 | $ 575,000 | $ 1,400,000 | $ 1,700,000 |
Depreciation and amortization, excluding finance leases | 445,000 | 540,000 | 1,300,000 | 1,600,000 |
Finance lease, asset, gross | 1,000,000 |  | 1,000,000 |  | $ 1,000,000
Finance lease, depreciation and amortization | 36,000 | 35,000 | $ 108,000 | 99,000 |
Number of assets disposed | asset |  |  | 2 |  |
Loss on disposal of equipment |  |  | $ 81,000 | 0 |
Payments to acquire assets |  |  | 947,000 | 2,112,000 |
Accumulated depreciation and amortization | 9,961,000 |  | 9,961,000 |  | 8,630,000
Servicing asset | 1,900,000 |  | 1,900,000 |  |
Servicing asset at fair value, amount |  |  |  |  | $ 807,000
Hosting arrangement, amortization expense | $ 0 | 157,000 | $ 0 | 471,000 |
Finance lease, weighted average remaining lease term | 2 years 9 months 29 days |  | 2 years 9 months 29 days |  |
2023 Finance Lease |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Finance lease costs | $ 368,000 |  |  | 368,000 |
Present value of minimum future obligations interest rate | 3.50% |  |  |  |
Finance lease, amortization | $ 17,800 | 17,100 | $ 52,800 | 45,100 |
2022 Finance Lease |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Finance lease costs | $ 370,000 |  |  | 370,000 |
Present value of minimum future obligations interest rate | 3.25% |  |  |  |
Finance lease, amortization | $ 18,700 | $ 18,000 | $ 55,600 | $ 54,000 |
Capitalized software development costs |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Useful lives | 3 years |  | 3 years |  |
Laboratory equipment |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Loss on disposal of equipment |  |  | $ 66,000 |  |
Payments to acquire assets |  |  | 128,000 |  |
Accumulated depreciation and amortization | $ 62,000 |  | 62,000 |  |
Computer equipment and software |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Loss on disposal of equipment |  |  | 15,000 |  |
Payments to acquire assets |  |  | 33,000 |  |
Accumulated depreciation and amortization | $ 18,000 |  | $ 18,000 |  |
Minimum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Useful lives | 3 years |  | 3 years |  |
Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Useful lives | 9 years |  | 9 years |  |

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