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Stockholder's Equity (Details Textuals 2) - USD ($) | 12 Months Ended | 68 Months Ended
--- | --- | ---
Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2020
Employee Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock authorized to purchase | 10,000,000 |  |  | 10,000,000
Discount from market price | 15.00% |  |  |
Offering period | 6 months |  |  |
Maximum percentage of salary withheld for employee contribution | up to 10% |  |  |
Compensation contribution limit in percentage | may not exceed 15 |  |  |
Number of shares of common stock issued pursuant to the ESPP | 123,106 | 177,043 | 185,168 | 8,776,482
Shares were available for future grant under the Plan (in shares) | 1,303,592 |  |  | 1,303,592
Maximum annual contributions per employee, percent |  | 10.00% |  |
Share-based compensation arrangement by share-based payment award, maximum employee contribution permitted value | $ 25,000 |  |  | $ 25,000
Maximum annual contributions per employee, conditional percent |  | 15.00% |  |
2007 Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock authorized to purchase | 32,000,000 |  |  | 32,000,000
Shares were available for future grant under the Plan (in shares) | 4,833,806 |  |  | 4,833,806

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