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Notes Payable (Details) - USD ($) |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 05, 2020 | Feb. 28, 2021 | Jan. 31, 2021 | Jul. 31, 2021 | Jul. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from PPP loans |  |  |  | $ 0 | $ 1,607,000
Paycheck Protection Program, CARES Act |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from PPP loans | $ 1,600,000 |  |  |  |
Interest rate (as a percent) | 1.00% |  |  |  |
Loan forgiveness |  |  | $ 757,000 |  |
Outstanding balance under the Loans |  |  |  | $ 0 |
Paycheck Protection Program, CARES Act | Klein Associates Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loan forgiveness |  | $ 850,000 |  |  |

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