Summary of Common Stock Reserved for Future Issuance (Details) - shares |
Oct. 31, 2022 |
Jul. 31, 2022 |
|---|---|---|
| Share-Based Payment Arrangement [Abstract] | ||
| Common Stock options outstanding (within the 2011 Plan and outside of the terms of the 2011 Plan) | 129,261 | 133,973 |
| Common Stock reserved for restricted stock unit settlement | 2,020 | 2,710 |
| Common Stock authorized for future grant under the 2011 Plan | 80,069 | 79,484 |
| Common Stock reserved for warrant exercise | 75,897 | 77,554 |
| Shares issuable under CGP and Sirtex stock purchase agreements (Note 6) | 85,585 | 87,455 |
| Common Stock reserved for future ESPP issuance | 1,218 | 1,218 |
| Total Common Stock reserved for future issuance | 374,050 | 382,394 |