| In millions, except per share items | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 | Dec-31-11 | Dec-31-10 | Dec-31-09 | Dec-31-08 |
| | 10-K | 10-K | 10-K | 10-K | 10-K/A | 10-K | 10-K | 10-K |
| Net income | -22.8 | -10.6 | -10.2 | -6.1 | -10.4 | -1.5 | -2.9 | -10.3 |
| Depreciation and amortization [+] | 22.0 | 17.2 | 11.5 | 9.4 | 7.0 | 5.4 | 4.9 | 5.5 |
| Depreciation | 10.4 | 7.7 | 6.1 | 5.0 | 3.5 | 3.0 | 2.9 | 2.2 |
| Amortization of intangible assets | 5.0 | 3.7 | 0.4 | 0.2 | 0.5 | 0.6 | 1.0 | 3.4 |
| Other amortization | 6.6 | 5.8 | 5.0 | 4.1 | 3.0 | 1.9 | 1.1 | |
| Stock-based compensation | 8.8 | 7.1 | 4.3 | 2.0 | 1.4 | 1.3 | 1.4 | 1.7 |
| Deferred taxes | -0.6 | -9.4 | | | | | | |
| Change in working capital [+] | 0.3 | -2.7 | 1.8 | 0.9 | -1.3 | -0.3 | -2.0 | 2.2 |
| Accounts receivable | -9.1 | -8.7 | -3.4 | -5.2 | -3.5 | -0.1 | -1.0 | 1.8 |
| Other current assets | -2.2 | -1.3 | -1.1 | -0.8 | -0.4 | -0.5 | -0.5 | |
| Accounts payable | 0.6 | 1.2 | 1.2 | 0.1 | 0.0 | 1.0 | -0.8 | -0.8 |
| Accrued expenses | -0.2 | 3.2 | 1.8 | 2.7 | 1.6 | -0.4 | 0.5 | |
| Deferred revenues | 3.4 | 5.9 | 2.5 | 1.9 | 1.1 | -0.3 | -0.1 | |
| Income taxes | 6.9 | -3.5 | 3.5 | 2.0 | 3.2 | 0.3 | | |
| Other | 1.0 | 0.4 | -2.7 | 0.1 | -3.3 | -0.4 | | |
| Other operating activities | -2.8 | 3.5 | 0.2 | -1.7 | 0.0 | 0.2 | 0.7 | 0.4 |
| Cash from operations | 4.9 | 5.2 | 7.6 | 4.4 | -3.2 | 5.1 | 2.2 | -0.5 |
| |
| Capital expenditures [+] | -24.6 | -24.3 | -11.6 | -9.2 | -10.0 | -5.2 | -4.6 | -2.3 |
| Purchases of property and equipment | -14.5 | -13.3 | -5.4 | -3.7 | -5.2 | -1.7 | -1.0 | -0.5 |
| Capitalized product costs | -10.1 | -11.0 | -6.2 | -5.5 | -4.8 | -3.4 | -3.6 | -1.8 |
| Purchases of intangible assets | | | | -0.1 | | | | |
| Acquisitions | | -13.1 | -2.7 | | | | | |
| Purchases of short-term investments, net | -75.7 | | | | | 0.1 | 0.2 | |
| Purchases of short-term investments | -113.0 | | | | | | | |
| Sales of short-term investments | 37.4 | | | | | 0.1 | 0.2 | |
| Other cash from investing | | | | 0.1 | | -0.5 | | |
| Cash from investing | -100.2 | -37.4 | -17.0 | -9.2 | -10.0 | -5.5 | -5.5 | -1.3 |
| |
| Issuance of common stock, net | -1.1 | -0.6 | -0.2 | 37.5 | 23.9 | | 8.4 | |
| Option exercises | 3.2 | 2.3 | 7.1 | 3.3 | 1.2 | 1.8 | 0.5 | |
| Financing costs | | 0.0 | 0.0 | 0.0 | -0.1 | | -0.1 | |
| Other cash from financing | | 18.2 | 17.0 | 1.7 | -2.1 | 1.7 | 2.1 | |
| Cash from financing | 92.0 | 15.4 | 9.8 | 35.9 | 20.7 | -0.1 | 10.1 | 3.2 |
| |
| Free cash flow | -9.6 | -8.0 | 2.2 | 0.7 | -8.4 | 3.3 | 1.1 | -1.0 |
| Per share (diluted) | ($0.32) | ($0.32) | ($0.07) | ($0.10) | ($0.33) | $0.00 | ($0.08) | ($0.09) |
| |
| Cash paid for interest | 1.7 | 0.4 | 0.3 | 0.3 | 0.4 | 0.2 | 0.6 | |