| 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 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | -8.5 | -9.7 | -18.0 | -9.7 | -10.9 | -11.4 | -17.1 | -28.3 |
| Depreciation and amortization [+] | 10.2 | 6.4 | 7.3 | 7.7 | 7.6 | 3.8 | 3.3 | 3.0 |
| Depreciation | 10.2 | 6.4 | 7.3 | 7.7 | 7.6 | 3.8 | 3.3 | 3.0 |
| Asset impairment charges | | | | | 0.4 | 0.2 | 0.1 | |
| Stock-based compensation | 31.3 | 25.7 | 23.9 | 21.0 | 18.2 | 12.0 | 11.0 | 11.1 |
| Change in working capital [+] | 0.8 | -6.3 | 0.4 | -3.9 | -18.1 | 4.5 | 10.0 | 19.7 |
| Accounts receivable | -1.6 | -2.7 | -2.4 | -5.0 | -11.0 | -0.3 | -5.1 | 5.7 |
| Inventories | 2.9 | -5.3 | -0.3 | -1.9 | 1.4 | -2.0 | 0.6 | 1.9 |
| Other current assets | 1.3 | -1.2 | -0.9 | -0.6 | -0.9 | -0.8 | -0.3 | -0.3 |
| Accounts payable | 1.7 | -2.6 | 1.5 | 1.5 | -0.6 | 0.2 | 1.1 | -1.7 |
| Accrued expenses | -2.1 | 7.5 | -2.4 | -2.6 | | | | |
| Deferred revenues | | | | | | | 4.1 | 2.8 |
| Other | -1.2 | -2.1 | 5.0 | 4.7 | -7.0 | 7.5 | 9.5 | 11.3 |
| Other operating activities | 20.2 | 10.7 | 2.2 | -0.8 | 10.5 | 2.2 | -7.4 | -10.2 |
| Cash from operations | 54.0 | 26.9 | 15.8 | 14.3 | 7.7 | 11.3 | -0.1 | -4.7 |
| |
| Capital expenditures | -3.8 | -4.2 | -4.6 | -4.9 | -2.8 | -4.7 | -1.2 | -2.0 |
| Purchases of property and equipment | -3.8 | -4.2 | -4.6 | -4.9 | -2.8 | -4.7 | -1.2 | -2.0 |
| Acquisitions | -35.4 | -24.2 | | | | -52.5 | | -7.0 |
| Purchases of short-term investments, net | -44.5 | 8.0 | -16.0 | -134.6 | -13.6 | 57.3 | -2.6 | -5.7 |
| Purchases of short-term investments | -251.8 | -139.7 | -137.5 | -206.8 | -67.4 | -86.6 | -109.3 | -112.3 |
| Sales of short-term investments | 207.4 | 147.7 | 121.5 | 72.2 | 53.8 | 143.9 | 106.7 | 106.6 |
| Other cash from investing | | | | | | | 0.0 | 0.3 |
| Cash from investing | -83.7 | -20.4 | -20.5 | -139.5 | -16.4 | 0.1 | -3.8 | -14.4 |
| |
| Repurchase of common stock, net | | | | | | | | 0.0 |
| Option exercises | 7.4 | 7.2 | 5.9 | 7.3 | 7.9 | 2.5 | 2.5 | 2.7 |
| Other cash from financing | 98.4 | 10.1 | 2.1 | 138.1 | 10.3 | 5.6 | 4.3 | 4.8 |
| Cash from financing | 91.1 | 2.9 | -3.8 | 130.8 | 2.4 | 3.1 | 1.8 | 2.1 |
| |
| Free cash flow | 50.1 | 22.6 | 11.2 | 9.4 | 4.9 | 6.6 | -1.3 | -6.7 |
| Per share (diluted) | $1.46 | $0.70 | $0.36 | $0.31 | $0.17 | $0.24 | ($0.05) | ($0.27) |
| |
| Cash paid for interest | 1.8 | 2.2 | 2.2 | 1.1 | | | | |