| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 |
| | 20-F | 20-F | 20-F | 20-F | 20-F | S-1/A | 20-F | 20-F |
| Net income | -14.8 | -17.1 | -2.3 | 23.0 | 15.6 | 11.4 | 1.0 | -76.5 |
| Depreciation and amortization | 12.2 | 12.9 | 9.7 | 7.8 | 9.2 | 10.0 | 12.2 | 13.5 |
| Asset impairment charges | | | | | | | 0.3 | |
| Stock-based compensation | 2.6 | 1.7 | 2.1 | 2.0 | 1.2 | 1.1 | 1.6 | 3.3 |
| Deferred taxes | 8.3 | -0.2 | -0.3 | -6.6 | 0.5 | | 2.0 | 9.8 |
| Change in working capital [+] | -11.7 | 24.8 | -21.6 | -7.7 | -12.5 | 7.2 | 2.2 | 18.0 |
| Accounts receivable | -11.2 | 9.3 | 4.5 | -11.1 | -6.4 | 11.1 | 39.5 | -33.9 |
| Inventories | -11.9 | 9.9 | -9.5 | -1.0 | -8.6 | 4.7 | 10.2 | 1.8 |
| Other current assets | -7.0 | -6.7 | -2.1 | 4.6 | -0.3 | | -1.3 | 11.3 |
| Accounts payable | 5.9 | 2.0 | -15.9 | 2.3 | 4.8 | -2.4 | -28.4 | 25.2 |
| Deferred revenues | 1.7 | 3.0 | 4.2 | -0.7 | 2.6 | -6.2 | -8.8 | 9.7 |
| Other | 10.8 | 7.3 | -2.8 | -2.0 | -4.7 | | -9.1 | 4.0 |
| Other operating activities | -11.6 | -4.8 | -0.5 | 4.1 | 3.2 | -3.9 | -3.2 | -0.5 |
| Cash from operations | -15.0 | 17.2 | -12.9 | 22.5 | 17.2 | 25.8 | 16.1 | -32.3 |
| |
| Capital expenditures [+] | -9.4 | -6.1 | -11.6 | -10.3 | -8.5 | -8.2 | -5.3 | -12.7 |
| Purchases of property and equipment | -9.4 | -6.1 | -11.6 | -10.3 | -8.5 | -8.2 | -5.3 | -12.7 |
| Sales of property and equipment | 0.2 | | | | | | | |
| Purchases of intangible assets | -0.2 | -0.4 | -3.3 | -3.4 | -1.4 | | | |
| Sales of short-term investments, net [+] | | | | | | | 0.5 | 5.1 |
| Purchases of short-term investments | | | | | | | 0.0 | 0.0 |
| Sales of short-term investments | | | | | | | 0.6 | 5.2 |
| Other cash from investing | | | 1.0 | -1.6 | -1.0 | | | 0.1 |
| Cash from investing | -9.4 | -6.5 | -13.9 | -15.3 | -10.9 | -8.2 | -4.7 | -7.5 |
| |
| Issuance of common stock, net | | | | | | | | 45.1 |
| Option exercises | 4.7 | 1.2 | 0.6 | 2.6 | 0.3 | | 0.1 | |
| Other cash from financing | 19.3 | -6.1 | 15.8 | 5.2 | -16.4 | | -15.7 | -6.3 |
| Cash from financing | 14.5 | -7.4 | 15.2 | 2.6 | -16.7 | 0.0 | -15.8 | 38.8 |
| |
| Free cash flow | -24.4 | 11.2 | -24.5 | 12.2 | 8.6 | 17.6 | 10.9 | -45.0 |
| Per share (diluted) | ($0.29) | $0.14 | ($0.31) | $0.15 | $0.11 | $0.23 | $0.14 | ($0.72) |
| |
| Cash paid for interest | 1.3 | 1.1 | 1.8 | 1.8 | 1.8 | | 2.8 | 3.5 |
| Cash paid for income taxes | 2.0 | 3.0 | 3.8 | 1.6 | 2.5 | | 1.5 | 2.6 |