| In millions, except per share items | Jun-30-23 | Mar-31-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Operating Activities: | | | | | | | | |
| Net income/(loss) | -3.9 | -6.1 | 14.5 | -7.9 | -2.3 | -4.3 | 2.4 | -2.6 |
| Adjustments to reconcile net income (loss) to cash used in operating activities: | | | | | | | | |
| Depreciation and amortization | 0.0 | 0.0 | | 0.0 | 0.0 | 0.0 | | 0.0 |
| Share-based compensation | 0.6 | 1.4 | | 3.8 | | | | |
| Operating lease asset amortization | 0.2 | 0.2 | | | 0.2 | 0.2 | | |
| Accretion of debt discount | 0.6 | 0.9 | | 0.2 | 0.0 | 2.1 | | 0.1 |
| Loss on equity method investment | 0.0 | | | 0.0 | | 0.0 | | |
| Inventory reserve expense | 0.0 | 0.1 | | | | | | |
| Changes in operating assets and liabilities: | | | | | | | | |
| Accounts receivable | 0.1 | -0.1 | 0.1 | 0.7 | -0.3 | -0.5 | | 0.0 |
| Inventories | -0.2 | 0.0 | 0.1 | 0.0 | 0.0 | 0.0 | 0.1 | 0.0 |
| Prepaid expenses and other current assets | 1.2 | -1.2 | 1.4 | -0.2 | -0.1 | -0.4 | 0.5 | 0.3 |
| Accounts payable | 0.6 | 0.0 | | -0.1 | 0.2 | 0.0 | 0.1 | 0.0 |
| Related party payable | 0.0 | -0.1 | 0.0 | 0.0 | 0.0 | | 0.1 | 0.0 |
| Operating lease liabilities | -0.2 | -0.2 | | | -0.2 | -0.2 | | |
| Accrued interest | -0.1 | 0.2 | | 0.0 | 0.0 | 0.0 | | 0.0 |
| Accrued expenses | -0.6 | -0.1 | | 0.8 | -0.1 | 0.4 | 0.3 | 0.3 |
| Net cash used in operating activities | -1.6 | -4.9 | -2.6 | -2.6 | -2.6 | -2.8 | -3.2 | -2.0 |
| |
| Investing Activities: | | | | | | | | |
| Contributions to equity method investment | | | 0.2 | | | -0.1 | | |
| Payments on purchase of assets | -3.8 | 0.0 | 0.1 | 0.0 | 0.0 | -0.1 | 0.2 | -0.1 |
| Patent activity costs | 0.0 | 0.0 | | | 0.0 | 0.0 | | |
| Net cash used in investing activities | -3.8 | -0.1 | -0.1 | 0.0 | 0.0 | -0.1 | -0.1 | -0.1 |
| |
| Financing Activities: | | | | | | | | |
| Proceeds from issuance of Series 1B Preferred Stock | 0.9 | | | | | | | |
| Payment of convertible notes | -0.9 | -0.1 | | | | | | |
| Net cash used in financing activities | 0.0 | -0.1 | 11.3 | 5.0 | | | 5.0 | 5.0 |
| Effect of foreign exchange rate on cash | 0.0 | | | | | | | |
| Net change in cash and cash equivalents | -5.4 | -5.1 | | | -2.6 | -2.9 | | |
| |
| Non-Cash Transactions: | | | | | | | | |
| Right-of-use assets acquired through operating lease liabilities | | | | | 0.0 | | | |
| Purchase of equipment not yet paid at end of period | | | 0.0 | 0.0 | 0.2 | | | |
| Non-cash conversions of convertible notes to equity | 1.8 | 1.6 | | | | 9.2 | | |
| Series 1A preferred stock conversion | | | | | | 0.0 | | |
| Down round deemed dividend | 11.7 | | | | | | | |
| Supplemental disclosure of cash flow information: | | | | | | | | |
| Interest | 0.2 | | | | | | | |