| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | -10.4 | -14.3 | -7.2 | -7.8 | -5.1 | -5.7 | -9.7 | -7.9 |
| Depreciation and amortization | 2.1 | 1.3 | 1.0 | 0.7 | 0.6 | 0.5 | 0.6 | 0.5 |
| Asset impairment charges | 0.1 | 0.0 | | | | | | |
| Stock-based compensation | 4.6 | 7.6 | 4.1 | 1.2 | 0.8 | 1.8 | 1.1 | 1.1 |
| Change in working capital [+] | -1.2 | 1.0 | 1.0 | 0.4 | -0.3 | 0.6 | 0.4 | -0.4 |
| Accounts receivable | | | | | -0.1 | -0.1 | 0.0 | 0.2 |
| Other current assets | -0.2 | -0.4 | -0.2 | -0.4 | 0.0 | 0.0 | 0.0 | 0.0 |
| Deferred revenues | | | | | | 0.8 | 0.3 | 0.1 |
| Other | -1.0 | 1.3 | 1.2 | 0.9 | -0.3 | -0.2 | 0.1 | -0.8 |
| Other operating activities | -0.1 | -0.6 | -0.8 | -0.1 | 2.4 | 1.2 | 5.2 | 1.2 |
| Cash from operations | -5.0 | -5.0 | -1.9 | -5.6 | -1.6 | -1.6 | -2.3 | -5.5 |
| |
| Capital expenditures [+] | -1.2 | -1.5 | -1.2 | -0.4 | -0.4 | -0.4 | 0.0 | -0.2 |
| Purchases of property and equipment | -0.1 | -0.1 | | -0.1 | 0.0 | 0.0 | | |
| Capitalized product costs | -1.2 | -1.4 | -1.2 | -0.3 | -0.4 | -0.4 | | -0.2 |
| Purchases of intangible assets | | | | | | | 0.0 | 0.0 |
| Other cash from investing | -4.5 | -0.1 | -0.1 | | 0.0 | | | |
| Cash from investing | -5.7 | -1.6 | -1.3 | -0.4 | -0.4 | -0.4 | 0.0 | -0.3 |
| |
| Issuance of common stock, net | -0.8 | 16.5 | 7.8 | | 5.6 | 1.6 | 2.1 | 0.3 |
| Option exercises | | 0.6 | 1.3 | 2.3 | 0.0 | | | |
| Other cash from financing | -0.6 | 0.6 | 3.8 | 4.5 | 0.3 | 1.0 | 0.0 | 5.4 |
| Cash from financing | -1.3 | 16.5 | 10.3 | 2.2 | 5.9 | 2.6 | 2.1 | 5.8 |
| |
| Free cash flow | -5.1 | -5.1 | -1.9 | -5.7 | -1.7 | -1.7 | -2.3 | -5.5 |
| Per share (diluted) | ($0.54) | ($0.59) | ($0.33) | ($0.74) | ($0.30) | ($0.44) | ($0.02) | ($0.07) |
| |
| Cash paid for interest | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | | | 0.0 |
| Cash paid for income taxes | 0.0 | 0.0 | | | | | | |