| In millions, except per share items | Jun-30-23 | Mar-31-23 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 |
| | 10-Q | 8-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
| OPERATING ACTIVITIES | | | | | | | | |
| Net income (loss) | | | -14.8 | -13.8 | -14.6 | -15.6 | -16.0 | -19.1 |
| |
| Adjustments to reconcile net income (loss) to net cash flows from (used in) operating activities: | | | | | | | | |
| Depreciation and amortization | | | 1.3 | 1.6 | 1.5 | 1.2 | 1.0 | 0.9 |
| Stock-based compensation | | | 1.7 | 2.3 | 3.1 | 3.2 | 3.1 | 2.9 |
| Loss on disposal of fixed assets | | | | 0.2 | 0.1 | | | |
| Non-cash lease expense, net | | | 0.0 | 0.0 | | | 0.3 | |
| Other | | | 0.4 | 0.2 | 0.2 | 0.2 | 0.1 | 0.2 |
| Change in operating assets and liabilities: | | | | | | | | |
| Accounts receivable, net | | | 0.9 | 0.1 | 0.0 | -1.0 | -0.5 | -0.2 |
| Inventory | | | 1.7 | 1.8 | 0.8 | 0.2 | -0.2 | -0.4 |
| Prepaid expenses and other | | | 1.6 | 1.1 | 1.0 | 1.0 | 1.2 | 1.6 |
| Accounts payable and accrued expenses | | | 0.0 | 1.8 | 1.7 | 1.6 | 0.8 | -0.2 |
| Net cash flows provided by (used in) operating activities | | | -3.3 | -4.3 | -6.2 | -7.5 | -7.8 | -7.9 |
| |
| FINANCING ACTIVITIES | | | | | | | | |
| Proceeds from issuance of preferred stock and common stock warrants, net of issuance costs | | | | 0.6 | 0.6 | | | |
| Proceeds from issuance of convertible notes, net of issuance costs | | | | 1.0 | 1.0 | | | |
| Repayment of note payable | | | -1.0 | | | -0.8 | | |
| Repayment of unsecured debt | | | -0.3 | -0.3 | -0.5 | | -0.7 | -0.6 |
| Net cash flows (used in) provided by financing activities | | | 2.7 | 2.4 | 2.9 | 4.4 | 3.7 | 3.4 |
| |
| Supplemental cash flow disclosure: | | | | | | | | |
| Interest paid | | | | 0.0 | 0.0 | | | 0.0 |
| Supplemental disclosures of non-cash transactions: | | | | | | | | |
| Services paid with common stock | | | | | 0.4 | | | |