| In millions, except per share items | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 | Dec-31-11 |
| | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | -18.8 | 1.8 | -3.2 | 4.3 | -0.2 |
| Depreciation and amortization | 20.2 | 10.6 | 7.8 | 5.4 | 3.9 |
| Stock-based compensation | 11.8 | 4.4 | 4.7 | 3.0 | 4.0 |
| Deferred taxes | -1.4 | 1.1 | 0.8 | 0.4 | 0.2 |
| Change in working capital [+] | 8.9 | 9.7 | 11.4 | 7.8 | 3.1 |
| Accounts receivable | 13.3 | -11.0 | -4.9 | -9.6 | -3.4 |
| Other current assets | -7.4 | -5.2 | -4.8 | -0.6 | |
| Deferred revenues | -5.7 | 17.3 | 13.6 | 13.6 | |
| Other | 8.6 | 8.6 | 7.5 | 4.5 | 6.5 |
| Other operating activities | 6.5 | 0.8 | 0.6 | 2.6 | 3.6 |
| Cash from operations | 27.2 | 28.4 | 22.1 | 23.6 | 14.6 |
| |
| Capital expenditures [+] | -26.2 | -32.6 | -11.3 | -8.1 | 0.0 |
| Purchases of property and equipment | -8.4 | -18.8 | -4.2 | -4.5 | |
| Capitalized product costs | -17.8 | -13.7 | -7.1 | -3.7 | |
| Acquisitions | -30.2 | -11.7 | -0.1 | -12.5 | |
| Purchases of short-term investments | -3.8 | -11.7 | -2.0 | -1.0 | -6.3 |
| Purchases of short-term investments | -3.8 | -11.7 | -2.0 | -1.0 | -6.3 |
| Other cash from investing | 0.0 | 0.3 | -0.2 | -0.5 | -5.4 |
| Cash from investing | -60.1 | -55.6 | -13.7 | -22.0 | -11.7 |
| |
| Issuance of common stock, net | | | 120.9 | -4.0 | |
| Option exercises | 2.1 | 0.8 | 0.5 | 1.1 | |
| Other cash from financing | 9.3 | 26.4 | 1.0 | 2.2 | 0.1 |
| Cash from financing | 7.2 | 25.6 | 121.4 | -2.9 | 0.1 |
| |
| Free cash flow | 18.8 | 9.5 | 17.9 | 19.1 | 14.6 |
| Per share (diluted) | $0.03 | ($0.10) | $0.42 | $0.44 | $0.87 |
| |