| In millions, except per share items | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 | Dec-31-11 | Dec-31-10 | Dec-31-09 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K/A | 10-K | 10-K |
| Net income | -58.1 | -59.5 | -40.9 | -0.4 | 2.2 | 0.9 | -13.1 | -13.4 |
| Depreciation and amortization [+] | 27.4 | 26.6 | 16.8 | 10.6 | 9.9 | 10.0 | 10.0 | 9.9 |
| Depreciation | 15.2 | 13.3 | 10.5 | 9.7 | | | | |
| Amortization | 12.2 | 13.3 | 6.3 | 0.9 | | | | |
| Stock-based compensation | 14.0 | 10.1 | 8.3 | 4.1 | 3.1 | 2.5 | 3.0 | 2.9 |
| Deferred taxes | 0.5 | 0.5 | -0.9 | 0.4 | 0.4 | -0.1 | 6.1 | |
| Change in working capital [+] | 20.8 | 25.3 | 13.0 | -4.5 | 0.4 | -0.1 | 7.5 | -1.8 |
| Accounts receivable | -0.4 | -2.7 | -6.4 | -6.5 | -1.8 | -2.6 | 0.5 | -0.7 |
| Inventories | -3.7 | 0.5 | -3.0 | -0.4 | -0.9 | -0.9 | 0.2 | -0.7 |
| Other current assets | -1.4 | 2.9 | -5.0 | -0.3 | -0.1 | -0.9 | 0.6 | 0.0 |
| Deferred revenues | 0.0 | -0.2 | 0.1 | -0.4 | 0.0 | -0.1 | -0.1 | -0.2 |
| Other | 26.3 | 24.9 | 27.2 | 3.0 | 3.2 | 4.3 | 6.3 | -0.2 |
| Other operating activities | -29.0 | -62.5 | -16.7 | -6.0 | -10.8 | -6.4 | -5.6 | -3.0 |
| Cash from operations | -24.4 | -59.5 | -20.4 | 4.2 | 5.2 | 6.7 | 7.9 | -5.4 |
| |
| Capital expenditures | -15.1 | -21.6 | -16.0 | -11.4 | -9.2 | -8.6 | -8.1 | -8.9 |
| Purchases of property and equipment | -15.1 | -21.6 | -16.0 | -11.4 | -9.2 | -8.6 | -8.1 | -8.9 |
| Purchases of intangible assets | | | | | | | | -0.2 |
| Acquisitions | | -30.0 | -234.0 | -6.5 | -7.7 | | | |
| Sales of short-term investments | | | | | | 4.4 | 6.2 | 10.6 |
| Sales of short-term investments | | | | | | 4.4 | 6.2 | 10.6 |
| Other cash from investing | 9.8 | 12.1 | 9.2 | 6.8 | 6.1 | 6.0 | 4.3 | 4.7 |
| Cash from investing | -5.4 | -39.5 | -240.7 | -11.1 | -10.8 | 1.7 | 2.4 | 6.1 |
| |
| Issuance of common stock, net | | | | 92.0 | | | | |
| Option exercises | 4.7 | 4.8 | 5.7 | 5.2 | 3.8 | 1.9 | 0.1 | 2.3 |
| Financing costs | | -0.4 | -7.5 | | | | | |
| Other cash from financing | 7.1 | 92.6 | 226.5 | | | | 0.3 | |
| Cash from financing | 2.4 | 88.2 | 228.2 | 97.3 | 3.8 | 1.9 | 0.1 | 2.3 |
| |
| Free cash flow | -39.6 | -81.1 | -36.4 | -7.2 | -4.0 | -1.9 | -0.2 | -14.3 |
| Per share (diluted) | ($0.92) | ($1.91) | ($0.87) | ($0.19) | ($0.11) | ($0.05) | ($0.01) | ($0.44) |
| |
| Cash paid for interest | 12.1 | 6.5 | 3.0 | 0.0 | 0.0 | 0.3 | 0.0 | 0.0 |
| Cash paid for income taxes | 0.4 | 0.3 | 0.8 | 0.4 | 0.1 | 0.1 | 0.2 | 0.2 |