| In millions, except per share items | Mar-31-22 | Mar-31-21 | Mar-31-20 | Mar-31-19 | Mar-31-18 | Mar-31-17 | Mar-31-16 | Mar-31-15 |
| | 10-K | 10-K | 10-K/A | 10-K | 10-K | 10-K | 10-K | 10-K |
| CASH FLOWS FROM OPERATING ACTIVITIES | | | | | | | | |
| Net loss | -39.6 | -16.4 | -14.8 | -8.6 | -6.7 | -3.5 | -8.3 | -7.1 |
| |
| Adjustments to reconcile net loss to net cash used in operating activities | | | | | | | | |
| Depreciation expense | 0.8 | 1.0 | 1.0 | 0.6 | 0.4 | 0.4 | 0.3 | 0.2 |
| Shares issued and vested, options and RSU expensed for employee and non-employee services | 8.4 | 3.7 | 1.6 | 0.4 | 3.6 | 0.4 | 4.6 | 3.7 |
| Amortization of debt discount | 0.3 | | | | | | | |
| |
| Debt conversion expense | | | | | | | | |
| Non-cash interest expense | 0.0 | | | | | | | |
| Non-cash lease expense | 0.0 | 0.0 | | | | | | |
| |
| Changes in operating assets and liabilities: | | | | | | | | |
| Accounts receivable | 0.5 | -3.5 | -1.8 | -0.5 | -1.2 | -0.5 | -0.5 | -0.3 |
| Inventory | -4.2 | -1.5 | -0.9 | -1.1 | -0.2 | -0.4 | -0.2 | -0.1 |
| Prepaid expenses and other current assets | -1.9 | 0.7 | -1.3 | -0.1 | 0.0 | -0.3 | 0.0 | 0.0 |
| Accounts payable | 3.4 | 1.6 | 2.5 | 0.8 | 0.7 | 0.5 | 0.3 | 0.2 |
| Accrued expenses | 0.7 | 0.1 | 0.1 | 0.3 | 0.4 | 0.2 | 0.1 | 0.1 |
| NET CASH USED IN OPERATING ACTIVITIES | -31.8 | -14.3 | -13.6 | -8.1 | -2.6 | -2.6 | -3.1 | -3.2 |
| |
| CASH FLOWS FROM INVESTING ACTIVITIES | | | | | | | | |
| Purchase of fixed assets | -1.0 | -0.6 | -0.5 | -1.4 | -0.3 | -0.3 | -0.3 | -0.4 |
| CASH USED IN INVESTING ACTIVITIES | -1.0 | -0.6 | -0.5 | -1.4 | -0.3 | -0.3 | -0.3 | -0.4 |
| |
| CASH FLOWS FROM FINANCING ACTIVITIES | | | | | | | | |
| Proceeds from sale of common stock, net | 5.2 | 14.9 | | 17.2 | | 0.4 | 3.8 | 2.4 |
| Proceeds for the exercise of warrants, net | 13.4 | 7.1 | 2.5 | 1.9 | 2.0 | 0.3 | | 1.3 |
| Proceeds for the exercise of stock options, net | 0.1 | 0.1 | | | | | | |
| CASH PROVIDED BY FINANCING ACTIVITIES | 25.2 | 19.4 | 7.7 | 19.5 | 3.3 | 2.2 | 4.6 | 3.6 |
| NET CHANGE IN CASH | -7.6 | 4.6 | -6.5 | | | | | |
| INTEREST PAID | 0.4 | 0.5 | 0.4 | 0.4 | 0.3 | 0.4 | 0.2 | 0.0 |