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Summary of Changes in Equity Method Investments (Details) - USD ($) $ in Thousands | 3 Months Ended
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Oct. 31, 2021 | Oct. 31, 2020
Purchase of convertible preferred stock | $ 1,051 |
Equity in the net loss of investee | (623) |
Convertible Preferred Stock [Member] | Equity Method Investee [Member] |  |
Balance, beginning of period | 2,901 |
Purchase of convertible preferred stock | 1,051 |
Equity in the net loss of investee | (441) |
Amortization of equity method basis difference | (182) |
Balance, end of period | $ 3,329 |

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