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Investments in Marketable Securities (Tables) | 3 Months Ended
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Oct. 31, 2023
Investments in Marketable Securities [Abstract] |
Schedule of Available-for-Sale Securities | The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities as of October 31, 2023 and July 31, 2023 are as follows:
October 31, 2023 |  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized (losses) |  |  | Fair value |
|  | (in thousands) |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Bills |  | $ | 12,421 |  |  | $ | — |  |  | $ | (3 | ) |  | $ | 12,418 |
U.S. Agency |  |  | 1,458 |  |  |  | — |  |  |  | (1 | ) |  |  | 1,457 |
Corporate bonds |  |  | 45,019 |  |  |  | 17 |  |  |  | (17 | ) |  |  | 45,019 |
Total available-for-sale securities |  | $ | 58,898 |  |  | $ | 17 |  |  | $ | (21 | ) |  | $ | 58,894 |
July 31, 2023 |  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized (losses) |  |  | Fair value |
|  | (in thousands) |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Bills |  | $ | 11,222 |  |  | $ | 53 |  |  | $ | — |  |  | $ | 11,275 |
Corporate bonds |  |  | 46,766 |  |  |  | 4,333 |  |  |  | (4,660 | ) |  |  | 46,439 |
Total available-for-sale securities |  | $ | 57,988 |  |  | $ | 4,386 |  |  | $ | (4,660 | ) |  | $ | 57,714 |

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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