| In millions, except per share items | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 | Dec-31-20 |
| | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| Net income | -3.3 | -8.3 | -10.2 | -7.3 | -10.4 | -13.6 | -22.1 | -11.5 |
| Depreciation and amortization | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Stock-based compensation | 1.5 | 1.4 | 1.3 | 1.4 | 1.4 | 1.2 | 1.2 | 0.6 |
| Change in working capital [+] | 1.8 | 0.6 | -1.8 | -4.2 | -0.8 | -3.0 | 0.2 | 1.6 |
| Accounts receivable | -3.4 | -2.3 | -3.1 | -1.5 | -4.1 | -3.1 | -1.1 | |
| Inventories | 0.2 | 0.4 | 0.0 | -0.4 | -1.3 | | | |
| Other current assets | 0.5 | 0.2 | 0.9 | -1.0 | 0.0 | -1.2 | 0.5 | -0.8 |
| Accounts payable | 1.4 | 0.6 | 0.3 | -2.2 | 1.8 | -0.8 | 0.6 | 1.4 |
| Accrued expenses | 1.6 | 1.0 | 1.6 | -1.0 | 2.0 | 0.3 | 1.7 | -0.7 |
| Other | 1.5 | 0.8 | -1.5 | 1.9 | 0.7 | 1.8 | -1.4 | 1.8 |
| Other operating activities | 0.2 | 3.8 | 2.5 | -2.1 | 1.7 | -3.3 | 2.4 | -3.7 |
| Cash from operations | 0.2 | -2.5 | -8.2 | -12.2 | -8.1 | -18.7 | -18.3 | -12.9 |
| |
| Capital expenditures | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | -0.1 |
| Purchases of property and equipment | | | | | | | | -0.1 |
| Sales of short-term investments, net [+] | 7.0 | -1.8 | 11.5 | 8.4 | 3.0 | -28.2 | | 29.0 |
| Purchases of short-term investments | | -6.0 | -3.0 | 0.0 | 0.1 | -28.2 | | |
| Sales of short-term investments | 7.0 | 4.2 | 14.5 | 8.4 | 2.9 | | | 29.0 |
| Cash from investing | 7.0 | -1.8 | 11.5 | 8.4 | 3.0 | -28.2 | 0.0 | 28.9 |
| |
| Issuance of common stock, net | | | | | | 0.1 | 55.0 | 5.9 |
| Option exercises | 0.0 | 0.6 | | 0.5 | | 0.1 | | 0.0 |
| Financing costs | | | | | | | -0.1 | |
| Other cash from financing | 0.1 | 1.1 | | 6.0 | -0.8 | 0.1 | 22.9 | 0.0 |
| Cash from financing | 0.0 | 0.6 | 0.0 | 5.5 | -0.8 | 0.2 | 78.0 | 5.9 |
| |
| Free cash flow | 0.2 | -2.5 | -8.2 | -12.2 | -8.1 | -18.7 | -18.3 | -13.0 |
| Per share (diluted) | $0.01 | ($0.07) | ($0.24) | ($0.35) | ($0.23) | ($0.54) | ($0.67) | ($0.50) |
| |
| Cash paid for interest | 1.2 | 1.0 | 0.9 | 0.9 | 0.9 | 0.8 | 0.4 | 0.4 |