| 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 | 10-Q | 10-Q | 10-Q | 10-Q | 8-K | 10-Q | 10-Q |
| Cash flows from operating activities: | | | | | | | | |
| Net loss | -25.6 | -23.6 | -31.7 | -32.4 | -35.2 | | -18.1 | -35.7 |
| Adjustments to reconcile net loss to net cash used in operating activities: | | | | | | | | |
| Depreciation and amortization | 1.1 | 0.8 | 0.7 | 0.6 | 0.5 | | 0.3 | 0.2 |
| Non-cash lease expense | 0.4 | 0.5 | | 0.5 | 0.4 | | | |
| (Gain) loss on marketable securities | -1.8 | | | 16.1 | | | | |
| (Gain) loss on disposal of fixed assets | 0.0 | 0.0 | | 0.0 | | | | |
| Change in fair value of warrant liabilities | 0.3 | -0.4 | -0.1 | -2.3 | -2.6 | | -7.0 | 3.5 |
| Change in fair value of contingent consideration | -0.4 | 0.0 | 0.0 | 0.1 | 0.1 | | | |
| Stock-based compensation | 1.9 | 3.9 | 4.0 | 3.8 | -0.7 | | 7.4 | 10.0 |
| Changes in operating assets and liabilities: | | | | | | | | |
| Accounts receivable, net | -0.2 | -0.1 | | | | | | |
| Inventory, net | 0.0 | -1.7 | | | | | | |
| Prepaid expenses and other current assets | -1.2 | 0.7 | -2.4 | 0.5 | 0.9 | | -2.8 | 1.2 |
| Operating lease right-of-use assets | -0.1 | | 0.2 | -0.8 | -8.5 | | -6.4 | |
| Other assets | 0.0 | | 0.0 | | | | -0.1 | |
| Accounts payable | -1.2 | -0.7 | -0.5 | -1.4 | 1.5 | | -0.4 | 0.5 |
| Accrued expenses and other current liabilities | 1.5 | -4.5 | 1.4 | 0.1 | 0.7 | | 0.7 | 0.4 |
| Other long-term liabilities | 0.0 | 0.0 | | | | | | |
| Operating lease liabilities | -0.5 | -0.7 | 0.1 | 0.9 | 8.3 | | 7.5 | |
| Net cash used in operating activities | -22.9 | -28.7 | -21.8 | -25.9 | -23.2 | | -18.5 | -19.1 |
| |
| Cash flows from investing activities: | | | | | | | | |
| Purchases of property and equipment | -1.0 | -2.6 | -1.8 | -3.0 | -2.5 | | -1.9 | -0.7 |
| Internally developed software - capitalized costs | 0.2 | -0.9 | | | | | | |
| Purchases of marketable securities | | | -0.7 | 0.7 | -0.8 | | -438.7 | |
| Sales of marketable securities | 30.0 | 29.5 | 19.7 | 75.1 | 25.0 | | | |
| Net cash provided by investing activities | 29.2 | 26.0 | 17.2 | 72.8 | 21.7 | | -440.6 | -0.7 |
| |
| Cash flows from financing activities: | | | | | | | | |
| Proceeds from exercise of stock options | | | 1.6 | 0.3 | 0.7 | | 0.7 | 2.7 |
| Payment of contingent consideration - business acquisition | | | | -0.3 | | | | |
| Payment of deferred consideration - business acquisition | | | | -0.5 | | | | |
| Net cash provided by financing activities | | | 1.6 | -0.6 | 0.7 | | -0.7 | 515.2 |
| Net increase in cash and cash equivalents | 3.6 | | | 45.5 | | | | |
| |
| Supplemental disclosure of non-cash investing and financing activities: | | | | | | | | |
| Property and equipment purchased but not paid | 0.8 | | | 0.6 | | | | |