In millions, except per share items | Apr-30-23 | Jan-31-23 | Oct-31-22 | Jul-31-22 | Apr-30-22 | Jan-31-22 | Oct-31-21 | Jul-31-21 |
| 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q |
Cash flows from operating activities: | | | | | | | | |
Net loss | -14.9 | -15.4 | -12.6 | -13.1 | -12.4 | -9.7 | -8.3 | -6.0 |
Adjustments to reconcile net loss to net cash used in operating activities: | | | | | | | | |
Depreciation expense | 0.0 | 0.0 | 0.0 | 0.0 | | | | |
Interest expense - debt discount | | | | | | 0.0 | 0.1 | 0.1 |
Gain on extinguishment of debt | | | | | 0.0 | | | |
Stock-based compensation to employees and consultants | 3.6 | 4.3 | 4.0 | 4.5 | 4.4 | 3.4 | 2.9 | 2.3 |
Changes in operating assets and liabilities: | | | | | | | | |
Prepaid expenses and other current assets | -0.1 | 0.1 | 0.5 | 0.6 | 0.6 | 0.0 | -0.2 | -0.3 |
Accounts payable and accrued liabilities | 1.7 | 2.2 | -0.4 | 0.0 | 0.7 | -0.4 | -0.2 | 0.0 |
Net cash used in operating activities | -8.9 | -8.3 | -8.2 | -7.9 | -6.6 | -6.3 | -5.3 | -3.7 |
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Cash flows from investing activities: | | | | | | | | |
Purchase of machinery | | | | | -0.1 | | | |
Net cash used in investing activities | | | | | -0.1 | | | |
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Cash flows from financing activities: | | | | | | | | |
Proceeds from the issuance of common stock and warrants - related party, net | | | | | 6.0 | | | 2.0 |
Proceeds from stock option exercise | | | | | 0.0 | 0.0 | 0.0 | 0.0 |
Payments of related party payable | | | | | -0.1 | | | |
Proceeds from initial public offering, net of underwriters’ discounts and commissions and issuance costs | | | | | | | | |
Net cash provided by financing activities | | | | | 18.9 | 18.1 | 18.9 | 19.3 |
Net (decrease) increase in cash | -8.9 | -4.4 | -4.4 | -4.1 | 12.1 | 9.9 | 11.6 | |
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Supplemental disclosures of cash flow information: | | | | | | | | |
Non-cash financing activities: | | | | | | | | |
Fair value of warrants issued in connection with March 2021 securities purchase agreement, related party | | | | | | | | |
Conversion of Series A Convertible Preferred Stock | | | | | | | | |
Issuance of common stock on conversion of note | | | | | | | | |
Fair value of warrants issued in connection with initial public offering | | | | | | | | |
Issuance of common stock for related party payable | | | | | | | | |