| In millions, except per share items | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 |
| | 10-K | 10-K | 10-K | 10-K |
| Net income | -44.0 | -19.1 | 1.2 | 0.2 |
| Depreciation and amortization | 0.2 | 0.2 | 0.2 | 0.5 |
| Stock-based compensation | 2.4 | 2.2 | 0.1 | 0.3 |
| Change in working capital [+] | 20.3 | -1.1 | 10.7 | -10.8 |
| Accounts receivable | | | 8.7 | -8.7 |
| Other current assets | -0.1 | -0.6 | -0.1 | 0.5 |
| Deferred revenues | | -2.0 | 1.1 | -2.2 |
| Other | 20.3 | 1.4 | 1.0 | -0.4 |
| Other operating activities | -16.9 | -0.1 | 0.0 | 0.0 |
| Cash from operations | -38.0 | -17.8 | 12.1 | -9.8 |
| |
| Capital expenditures [+] | -0.3 | -0.3 | -0.2 | -0.1 |
| Purchases of property and equipment | -0.3 | -0.3 | -0.2 | -0.1 |
| Sales of property and equipment | | 0.0 | 0.0 | |
| Purchases of short-term investments, net | -11.8 | -24.6 | 5.9 | -3.4 |
| Purchases of short-term investments | -71.4 | -50.5 | -23.0 | -32.6 |
| Sales of short-term investments | 59.6 | 25.9 | 28.9 | 29.2 |
| Cash from investing | -12.1 | -24.8 | 5.7 | -3.5 |
| |
| Issuance of common stock, net | 39.8 | 58.9 | 0.1 | 0.0 |
| Financing costs | | | | 0.0 |
| Other cash from financing | -7.5 | -7.9 | -4.4 | 0.0 |
| Cash from financing | 32.4 | 51.0 | -4.3 | 0.0 |
| |
| Free cash flow | -38.3 | -18.1 | 11.9 | -10.0 |
| Per share (diluted) | ($1.77) | ($3.42) | $21.22 | ($18.38) |
| |
| Cash paid for interest | 0.4 | 0.7 | 1.2 | 1.2 |