| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 |
| | 10-K | 10-K | 10-K | S-1/A |
| Net income | -47.1 | -36.1 | -24.3 | 0.0 |
| Depreciation and amortization [+] | 0.3 | 0.3 | 0.3 | 0.4 |
| Depreciation | 0.3 | 0.3 | 0.3 | 0.4 |
| Asset impairment charges | 0.2 | 0.2 | 0.3 | |
| Stock-based compensation | 8.3 | 4.3 | 1.4 | 1.4 |
| Change in working capital [+] | -2.7 | 0.4 | -2.1 | 0.5 |
| Accounts receivable | -0.4 | 1.3 | -2.4 | -0.8 |
| Inventories | -2.1 | -1.2 | 0.7 | -1.6 |
| Other current assets | -0.8 | -1.2 | 0.1 | |
| Accounts payable | 0.6 | 0.5 | 0.0 | -0.1 |
| Accrued expenses | 0.0 | 1.7 | -0.7 | |
| Other | | -0.8 | 0.2 | 3.0 |
| Other operating activities | 4.0 | 6.3 | 2.7 | -27.4 |
| Cash from operations | -36.9 | -24.6 | -21.6 | -25.0 |
| |
| Capital expenditures | -0.6 | -0.4 | -0.1 | -0.5 |
| Purchases of property and equipment | -0.6 | -0.4 | -0.1 | -0.5 |
| Purchases of short-term investments, net | 24.4 | -85.0 | -10.7 | 4.1 |
| Purchases of short-term investments | | -85.0 | -17.0 | -18.0 |
| Sales of short-term investments | 24.4 | | 6.3 | 22.1 |
| Other cash from investing | | | | 0.0 |
| Cash from investing | 23.8 | -85.4 | -10.8 | 3.6 |
| |
| Issuance of common stock, net | | 109.1 | | |
| Option exercises | 0.9 | 0.9 | 0.0 | |
| Financing costs | | | -1.0 | |
| Other cash from financing | 1.4 | -5.6 | 54.1 | 21.4 |
| Cash from financing | 0.5 | 102.5 | 55.0 | 21.4 |
| |
| Free cash flow | -37.5 | -25.0 | -21.7 | -25.5 |
| Per share (diluted) | ($1.52) | ($1.50) | ($106.19) | ($0.13) |
| |
| Cash paid for interest | 4.5 | 6.3 | 4.4 | |