| In millions, except per share items | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 | Dec-31-11 | Dec-31-10 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | -20.6 | -7.8 | -15.5 | 7.0 | -12.3 | -4.4 | -3.0 | -3.1 |
| Depreciation and amortization [+] | 1.6 | 2.5 | 2.9 | 3.3 | 2.8 | 2.1 | 2.3 | 3.3 |
| Amortization of intangible assets | | | | | | 0.2 | 0.2 | 0.4 |
| Stock-based compensation | 1.4 | 1.1 | -0.6 | 2.0 | 3.2 | 2.4 | 1.7 | 1.7 |
| Deferred taxes | | | 0.1 | -0.1 | 0.2 | 0.1 | -0.1 | -0.2 |
| Change in working capital [+] | 6.0 | -1.3 | -0.9 | -2.2 | 2.8 | 2.4 | -7.0 | 0.0 |
| Accounts receivable | 3.4 | -2.6 | 0.2 | 2.8 | 1.8 | 4.1 | 2.4 | 1.6 |
| Other current assets | -0.8 | 1.5 | -0.5 | -0.4 | 0.6 | 0.9 | 0.9 | 1.2 |
| Accounts payable | 2.3 | 0.4 | -0.9 | -1.6 | 2.1 | -1.1 | -5.1 | -1.1 |
| Accrued expenses | -0.2 | -0.6 | -1.9 | -3.4 | -0.3 | -0.8 | -5.3 | -0.9 |
| Deferred revenues | 1.3 | -0.1 | 2.0 | -0.3 | -1.2 | -0.4 | 0.4 | -0.4 |
| Other | -0.1 | 0.1 | 0.2 | 0.8 | -0.2 | -0.3 | -0.3 | -0.2 |
| Other operating activities | 0.1 | 0.0 | 0.3 | -24.9 | 0.9 | 0.8 | 0.7 | 0.2 |
| Cash from operations | -11.5 | -5.5 | -13.6 | -14.8 | -2.4 | 3.5 | -5.5 | 2.0 |
| |
| Capital expenditures | -0.8 | -0.6 | -0.8 | -1.3 | -2.3 | -4.5 | -1.8 | -3.0 |
| Purchases of property and equipment | -0.8 | -0.6 | -0.8 | -1.3 | -2.3 | -4.5 | -1.8 | -3.0 |
| Sales of short-term investments | | | | | | | | 3.8 |
| Sales of short-term investments | | | | | | | | 3.8 |
| Other cash from investing | | | 1.6 | 26.9 | 0.7 | 1.0 | 1.1 | -1.1 |
| Cash from investing | -0.8 | -0.6 | 0.7 | 25.5 | -1.6 | -3.5 | -0.7 | -0.4 |
| |
| Cash dividends paid | | | | | | | | -4.0 |
| Issuance of common stock, net | 1.2 | -0.3 | | 0.2 | 1.5 | 1.4 | 0.9 | -4.7 |
| Other cash from financing | 0.2 | 2.2 | -0.6 | | | | | |
| Cash from financing | 1.4 | 1.8 | -0.6 | -0.9 | 1.2 | 1.4 | 0.9 | -8.8 |
| |
| Free cash flow | -12.4 | -6.1 | -14.4 | -16.2 | -4.8 | -1.0 | -7.3 | -1.1 |
| Per share (diluted) | ($0.19) | ($0.09) | ($0.23) | ($0.26) | ($0.07) | ($0.02) | ($0.13) | ($0.02) |
| |
| Cash paid for income taxes | 0.2 | 0.2 | 0.2 | 0.3 | 0.3 | 0.4 | 0.6 | -0.8 |