| In millions, except per share items | Jun-30-23 | Jun-05-23 | Mar-31-23 | Dec-31-22 | Dec-05-22 | Sep-30-22 | Sep-05-22 | Jun-30-22 |
| | 10-Q | 8-K | 10-Q | 10-K | 8-K | 10-Q | 8-K | 10-Q |
| Cash flows from operating activities | | | | | | | | |
| Net loss | -14.8 | | -17.1 | 69.3 | | -22.2 | | -23.8 |
| |
| Adjustments to reconcile net loss to net cash used in operating activities: | | | | | | | | |
| Depreciation | 0.1 | | 0.1 | | | 0.2 | | 0.2 |
| Accretion of debt discount and amortization of debt issuance costs | 0.2 | | 0.1 | | | 0.2 | | 0.2 |
| Stock-based compensation expense | 3.7 | | 3.5 | | | 3.2 | | 3.5 |
| Provision for credit losses | 0.3 | | -0.3 | | | 0.3 | | 0.2 |
| Provision for excess and obsolete inventories | 0.2 | | 0.0 | | | 0.0 | | 0.1 |
| Noncash operating lease expense | 0.2 | | 0.2 | | | | | 0.1 |
| Loss on disposal of property and equipment | | | 0.1 | | | 0.0 | | 0.0 |
| Changes in operating assets and liabilities: | | | | | | | | |
| Accounts receivable | -2.0 | | -1.0 | 4.3 | | -2.4 | | -0.7 |
| Inventory | -1.0 | | -1.0 | 2.2 | | -0.6 | | -1.0 |
| Prepaid expenses and other current assets | 1.0 | | 0.6 | 0.2 | | -2.4 | | 0.7 |
| Other noncurrent assets | -0.1 | | 0.0 | | | 0.0 | | 0.0 |
| Accounts payable | -0.7 | | 0.9 | 0.1 | | 0.5 | | -0.4 |
| Accrued compensation | 0.8 | | -2.4 | -0.6 | | 1.7 | | 2.4 |
| Accrued and other current liabilities | -1.5 | | -1.3 | | | 1.0 | | 0.1 |
| Other noncurrent liabilities | 0.1 | | 0.1 | | | 0.1 | | 0.1 |
| Net cash used in operating activities | -13.5 | | -17.4 | -15.5 | | -20.2 | | -18.3 |
| |
| Cash flows from investing activities | | | | | | | | |
| Purchases of property and equipment | -0.1 | | -0.1 | 1.8 | | -0.3 | | -0.3 |
| Net cash used in investing activities | -0.1 | | -0.1 | -0.1 | | -0.3 | | -0.3 |
| |
| Cash flows from financing activities | | | | | | | | |
| Proceeds from exercise of common stock options | 0.1 | | 0.0 | 0.1 | | 0.2 | | 0.2 |
| Taxes paid on the net share settlement of restricted stock units | 0.0 | | -0.2 | | | | | |
| Proceeds from employee stock purchase plan purchases | 0.7 | | | | | | | |
| Net cash provided by financing activities | 0.8 | | -0.2 | 0.8 | | 0.2 | | 0.2 |
| Net change in cash and cash equivalents | -12.8 | | -17.7 | | | | | -18.5 |
| |
| Supplemental disclosure of cash flow information | | | | | | | | |
| Cash paid for interest | 1.1 | | 1.0 | 0.9 | | 0.8 | | 0.8 |
| |
| Supplemental noncash disclosure | | | | | | | | |
| Acquisition of property and equipment included in accounts payable and accrued liabilities | 0.1 | | 0.0 | 0.1 | | -0.2 | | -0.1 |