| 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 | -77.3 | 7.0 | -33.2 | -95.3 | 68.3 | -41.3 | 41.8 | -89.5 |
| Depreciation and amortization [+] | 0.8 | 1.7 | 2.5 | 7.4 | 4.9 | 14.5 | 13.1 | 14.1 |
| Depreciation | | 1.3 | 1.7 | 0.8 | 1.2 | 0.6 | 0.6 | 2.4 |
| Amortization | | 0.4 | 0.8 | 6.6 | 3.7 | 13.9 | 12.6 | 11.7 |
| Asset impairment charges | | | | 66.1 | | | | |
| Stock-based compensation | 8.9 | 3.0 | 0.5 | 7.9 | 8.1 | 14.7 | 7.7 | 2.7 |
| Deferred taxes | -15.7 | -7.4 | -6.3 | -19.2 | 3.6 | -4.0 | 0.1 | -2.1 |
| Change in working capital [+] | 9.0 | -3.0 | 14.8 | 1.1 | 16.8 | 2.2 | -14.9 | 0.7 |
| Accounts receivable | | 8.3 | 2.5 | 3.5 | 3.1 | -10.1 | -8.4 | 3.2 |
| Inventories | | -1.4 | 1.2 | 0.7 | -2.9 | 1.8 | 3.0 | -3.1 |
| Other current assets | -0.4 | 1.9 | -1.2 | 3.6 | -3.7 | 3.4 | -0.7 | -2.3 |
| Accounts payable | 4.2 | -2.8 | 4.6 | -2.0 | 0.6 | -0.4 | -8.5 | 7.2 |
| Accrued expenses | 0.9 | -13.2 | 0.4 | -10.6 | 13.2 | 6.8 | 3.4 | 0.5 |
| Deferred revenues | | | | | | | 3.8 | -0.1 |
| Income taxes | 4.3 | 4.2 | 7.4 | 6.0 | 6.6 | 0.6 | -7.4 | -4.7 |
| Other operating activities | -3.0 | -50.0 | -16.6 | -50.7 | -84.9 | 32.9 | | |
| Cash from operations | -77.3 | -48.7 | -38.3 | -82.7 | 16.7 | 18.9 | 84.3 | -10.6 |
| |
| Capital expenditures [+] | 0.0 | -0.1 | 0.0 | -0.2 | -0.6 | -1.2 | -1.6 | -1.7 |
| Purchases of property and equipment | 0.0 | -0.1 | 0.0 | -0.2 | -0.6 | -1.2 | -1.6 | -1.7 |
| Sales of property and equipment | | | 0.2 | | | | | 13.2 |
| Purchases of intangible assets | | | | -20.0 | -53.1 | | | |
| Purchases of short-term investments, net | 40.5 | -95.1 | 38.6 | -16.8 | 38.0 | -36.1 | -30.1 | -54.6 |
| Purchases of short-term investments | -61.8 | -131.4 | -24.6 | -376.3 | -151.0 | -107.6 | -78.4 | -79.6 |
| Sales of short-term investments | 102.2 | 36.3 | 63.2 | 359.5 | 189.0 | 71.5 | 48.3 | 25.0 |
| Other cash from investing | 16.5 | 25.5 | | | | 0.6 | | |
| Cash from investing | 56.9 | -69.7 | 38.7 | -37.0 | -15.7 | -36.6 | -31.7 | -43.1 |
| |
| Issuance of common stock, net | | 177.5 | | -27.6 | -22.0 | 0.4 | 7.0 | 132.3 |
| Option exercises | 0.3 | 2.2 | 0.1 | 0.6 | | | | |
| Other cash from financing | 0.5 | 4.4 | 0.1 | 140.9 | -1.4 | -8.4 | -30.7 | -36.3 |
| Cash from financing | 0.3 | 179.7 | 0.0 | 112.7 | -23.3 | -8.0 | -23.8 | 96.0 |
| |
| Free cash flow | -77.3 | -48.8 | -38.4 | -82.9 | 16.1 | 17.7 | 82.7 | -12.3 |
| Per share (diluted) | ($1.32) | ($0.89) | ($1.03) | ($2.22) | $0.38 | $0.43 | $1.90 | ($0.34) |
| |
| Cash paid for interest | 6.5 | 6.5 | 6.5 | 3.4 | 1.1 | 0.8 | 4.7 | 4.4 |
| Cash paid for income taxes | 0.1 | -1.7 | 0.1 | 0.8 | | | | |