| 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/A | 10-K/A | 10-K/A |
| Net income | -1.1 | 1.6 | 1.1 | -2.7 | -11.0 | -22.6 | -15.6 | -0.8 |
| Depreciation and amortization [+] | 2.5 | 2.8 | 2.6 | 3.0 | 2.9 | 3.4 | 4.6 | 4.4 |
| Depreciation | 2.5 | 2.8 | 2.6 | 3.0 | 2.9 | 2.7 | 3.3 | 3.1 |
| Amortization of intangible assets | | | | | | 0.7 | 1.3 | 1.3 |
| Asset impairment charges | 0.2 | | | | | 1.1 | 0.0 | |
| Stock-based compensation | 0.3 | 0.4 | 0.2 | 0.2 | 0.3 | 0.3 | 0.2 | 0.1 |
| Deferred taxes | -0.3 | -0.3 | | | | | 2.1 | -0.2 |
| Change in working capital [+] | 0.1 | -0.7 | -4.1 | -2.1 | 1.4 | -0.5 | 13.8 | -5.0 |
| Accounts receivable | 1.3 | -1.6 | -1.0 | -1.6 | -0.6 | 1.0 | 4.6 | 0.1 |
| Inventories | -2.3 | 2.6 | -3.5 | 0.4 | 1.4 | 0.9 | -2.9 | -8.4 |
| Other current assets | -0.1 | -0.1 | 0.0 | 0.0 | 0.0 | 0.3 | 0.4 | -0.7 |
| Deferred revenues | | | -0.1 | 0.1 | 2.1 | 0.4 | 0.1 | 0.5 |
| Other | 1.1 | -1.6 | 0.5 | -0.9 | -1.6 | -3.1 | 11.6 | 3.6 |
| Other operating activities | -1.2 | 0.2 | -1.3 | 0.7 | 4.1 | 14.2 | -5.7 | 0.7 |
| Cash from operations | 0.4 | 4.1 | -1.5 | -0.9 | -2.3 | -4.0 | -0.7 | -0.9 |
| |
| Capital expenditures [+] | -2.4 | -1.4 | -3.8 | -0.8 | -1.3 | -1.5 | -1.6 | -1.6 |
| Purchases of property and equipment | -2.4 | -1.4 | -3.8 | -0.8 | -1.3 | -1.5 | -1.6 | -1.6 |
| Sales of property and equipment | | | | | | | 1.7 | |
| Acquisitions | 0.4 | | 0.1 | | | | | |
| Other cash from investing | -0.4 | | -0.1 | | 4.9 | 3.3 | -1.0 | -7.0 |
| Cash from investing | -2.4 | -1.4 | -3.8 | -0.8 | 3.7 | 1.8 | -0.9 | -8.6 |
| |
| Issuance of common stock, net | | | 1.0 | | 2.9 | 7.7 | | -4.7 |
| Financing costs | 0.0 | | -0.1 | | -0.1 | -0.1 | -0.2 | -0.4 |
| Other cash from financing | 1.5 | -4.6 | 5.5 | 0.9 | -3.0 | -6.2 | 2.2 | 12.8 |
| Cash from financing | 1.6 | -4.6 | 6.5 | 0.9 | 0.0 | 1.6 | 2.4 | 8.6 |
| |
| Free cash flow | -1.9 | 2.7 | -5.3 | -1.7 | -3.6 | -5.5 | -2.3 | -2.5 |
| Per share (diluted) | ($0.59) | $0.74 | ($0.14) | ($0.06) | ($0.13) | ($0.42) | ($0.31) | ($0.33) |
| |
| Cash paid for interest | 1.3 | 1.2 | 0.9 | 2.3 | 1.5 | 2.0 | 1.5 | 1.6 |
| Cash paid for income taxes | 0.0 | 0.0 | | 0.0 | 0.0 | 0.0 | 0.0 | 0.4 |