| In millions, except per share items | Mar-31-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 |
| | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| Cash flows from operating activities: | | | | | | | | |
| Net loss | -1.2 | -0.7 | -1.4 | -1.4 | -0.5 | -1.1 | -0.6 | -2.9 |
| Adjustments to reconcile net loss to net cash (used in) from operating activities: | | | | | | | | |
| Depreciation and amortization | 0.8 | 0.8 | 0.8 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 |
| Interest from amortization of debt costs | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| (Gain) loss on disposal of property and equipment | -0.1 | | | | 0.0 | | | |
| Stock-based compensation on stock options, RSUs & RSAs, net | 0.3 | 0.8 | | | 0.2 | 0.3 | | |
| Provision for doubtful accounts receivable | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | | 0.0 | 0.0 |
| Change in operating lease assets and liabilities | 0.0 | -0.1 | | | -0.1 | -0.1 | | |
| Inventory write-offs to allowance | 0.1 | 0.0 | | 0.3 | 0.1 | 0.0 | 0.1 | 0.0 |
| Deferred tax benefit | 0.0 | 0.0 | 0.0 | | | | | |
| Changes in operating assets and liabilities: | | | | | | | | |
| Trade accounts receivable | 0.0 | -0.2 | 0.6 | -0.3 | 0.0 | 0.8 | -1.1 | 1.7 |
| Other receivables | 0.1 | -0.1 | | | 0.2 | -0.1 | | 0.0 |
| Inventories | -1.4 | 0.1 | 0.0 | 0.4 | -0.4 | 1.3 | -0.1 | 0.2 |
| Prepaid expenses and other assets | -0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Accounts payable and accrued liabilities | 1.1 | -0.6 | -0.6 | 0.4 | 0.0 | -0.7 | -0.8 | 1.1 |
| Net cash (used in) provided by operating activities | -0.2 | -0.3 | -0.4 | 1.1 | 0.5 | 1.5 | -1.6 | 1.7 |
| |
| Cash flows from investing activities: | | | | | | | | |
| Purchase of property and equipment | -1.9 | -0.2 | -0.2 | -1.6 | -0.2 | -0.1 | -1.2 | -3.2 |
| Proceeds from sale of equipment | 0.1 | | | | | | | |
| Net cash used in investing activities | -1.8 | -0.2 | -0.2 | -0.1 | -0.2 | -0.1 | -1.2 | -0.4 |
| |
| Cash flows from financing activities: | | | | | | | | |
| Proceeds from sale of common stock from Employee Stock Purchase Plan | 0.0 | | 0.0 | | 0.0 | | 0.0 | 0.0 |
| Proceeds from issuance of common stock under public equity placement | 9.2 | | | | | | | |
| Loan costs | | | | | | -0.1 | | |
| Borrowings on loans payable | | | | | | | 0.3 | |
| Payments on loans payable | -1.2 | -0.2 | -0.2 | -0.2 | -0.2 | -0.2 | -0.2 | -0.5 |
| Repayment of finance lease obligations | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | -0.1 | -0.1 | -0.1 |
| Net cash provided by (used in) financing activities | 8.0 | -0.3 | -0.2 | -0.2 | -0.2 | -0.3 | 0.1 | -0.5 |
| Effect of exchange rate on cash and cash equivalents | 0.2 | 0.3 | -0.4 | -0.5 | 0.0 | 0.0 | 0.0 | 0.1 |
| Change in cash and cash equivalents | 6.1 | -0.5 | -1.2 | 0.3 | 0.2 | 1.1 | -2.8 | 0.8 |
| Cash and cash equivalents, beginning of period | -5.5 | | 5.5 | | | | 6.8 | |
| Cash and cash equivalents, end of period | -3.8 | -0.5 | 4.3 | 0.3 | 0.2 | 1.1 | 4.0 | 0.8 |
| |
| Supplemental disclosure of cash flow information: | | | | | | | | |
| Interest paid in cash | 0.1 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Income taxes paid | 0.1 | 0.1 | 0.1 | 0.0 | 0.0 | 0.1 | 0.1 | 0.3 |
| Supplemental disclosure of non-cash investing & financing activities: | | | | | | | | |
| Purchase of equipment through finance lease arrangements | | | | | | | | |