| 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 | -5.3 | -23.5 | -8.5 | -9.3 | -7.1 | -9.7 | -7.3 | -8.3 |
| Depreciation and amortization | 0.7 | 0.8 | 0.9 | 1.0 | 1.2 | 1.4 | 1.7 | 1.3 |
| Asset impairment charges | | 4.7 | | | 0.5 | 1.3 | 0.1 | |
| Stock-based compensation | 0.4 | 1.6 | 0.8 | 0.6 | 0.7 | 0.5 | 1.5 | 0.3 |
| Deferred taxes | | | | | | -0.2 | -0.1 | -0.7 |
| Change in working capital [+] | -0.6 | -9.2 | 2.6 | -0.7 | 3.8 | 8.6 | -7.1 | 3.9 |
| Accounts receivable | 3.4 | -1.1 | -1.7 | 2.0 | -0.5 | 6.4 | -6.5 | 3.0 |
| Inventories | 2.1 | 1.0 | -2.5 | -1.4 | 2.0 | 0.5 | -5.3 | 1.8 |
| Other current assets | 0.5 | 0.6 | -0.3 | -0.1 | -0.1 | -0.2 | 0.1 | 0.8 |
| Accounts payable | | | | | -0.2 | -0.4 | 1.5 | -0.8 |
| Accrued expenses | | | | | 0.4 | -0.1 | | |
| Income taxes | -0.3 | -11.5 | 4.3 | 1.6 | 2.4 | 2.3 | 4.3 | -0.8 |
| Other | -6.2 | 1.9 | 2.8 | | -0.2 | 0.1 | -1.1 | |
| Other operating activities | -0.5 | 18.6 | -6.6 | | 0.1 | -2.2 | -3.4 | |
| Cash from operations | -5.3 | -7.0 | -10.9 | -9.9 | -0.8 | -0.2 | -14.6 | -3.7 |
| |
| Capital expenditures [+] | 0.0 | -0.1 | -0.7 | -0.5 | -0.1 | -0.2 | -0.6 | -0.4 |
| Purchases of property and equipment | 0.0 | -0.1 | -0.7 | -0.5 | -0.1 | -0.2 | -0.6 | -0.4 |
| Sales of property and equipment | | 0.1 | 0.2 | 0.3 | | 0.0 | 0.0 | |
| Other cash from investing | 3.3 | | | 1.4 | | | 0.1 | |
| Cash from investing | 3.3 | -0.1 | -0.5 | 1.3 | -0.9 | -0.1 | -0.5 | 5.1 |
| |
| Issuance of common stock, net | | 10.2 | 7.1 | | 1.8 | | 10.2 | |
| Option exercises | 0.0 | | | 0.5 | | | | |
| Financing costs | | | | | | -0.1 | -0.2 | -0.3 |
| Other cash from financing | -3.3 | 1.9 | 0.7 | 12.5 | | | 3.4 | |
| Cash from financing | -3.3 | 12.1 | 7.8 | 12.0 | -1.4 | 3.7 | 13.8 | 2.0 |
| |
| Free cash flow | -5.4 | -7.2 | -11.5 | -10.4 | -1.0 | -0.4 | -15.2 | -4.1 |
| Per share (diluted) | ($0.34) | ($1.17) | ($3.66) | ($0.86) | ($0.12) | ($0.06) | ($2.72) | ($3.31) |
| |
| Cash paid for interest | | | 0.0 | 1.1 | 1.2 | 1.1 | 1.0 | 0.5 |
| Cash paid for income taxes | 0.1 | 0.0 | 0.0 | 0.9 | -0.4 | 0.1 | 0.2 | 1.5 |