| In millions, except per share items | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | S-1/A |
| Net income | 0.1 | -8.9 | -7.8 | -8.8 | -18.3 | 0.0 |
| Depreciation and amortization | 0.5 | 0.7 | 0.8 | 0.9 | 1.0 | |
| Asset impairment charges | 0.0 | 0.6 | | | | |
| Stock-based compensation | 0.2 | 0.5 | 1.1 | 0.9 | 0.7 | |
| Deferred taxes | 0.0 | -0.1 | 0.0 | 0.0 | 0.0 | |
| Change in working capital [+] | 3.8 | 6.8 | 1.7 | -4.7 | -4.8 | |
| Accounts receivable | -0.6 | 0.6 | -0.1 | -3.5 | -0.9 | |
| Inventories | 1.7 | 1.8 | 7.0 | -5.1 | -5.3 | |
| Accounts payable | 3.5 | -0.5 | -0.3 | 2.0 | 1.5 | |
| Accrued expenses | -1.0 | -0.7 | -2.2 | 3.3 | 1.6 | |
| Deferred revenues | | | -0.6 | -0.2 | | |
| Other | 0.2 | 5.6 | -2.1 | -1.3 | -1.8 | |
| Other operating activities | -8.3 | -0.4 | -0.2 | -3.2 | 15.3 | |
| Cash from operations | -3.8 | -0.8 | -4.4 | -14.8 | -6.1 | |
| |
| Capital expenditures [+] | -0.3 | -0.3 | -1.3 | -1.1 | -0.4 | |
| Purchases of property and equipment | -0.3 | -0.3 | -1.3 | -1.1 | -0.4 | |
| Sales of property and equipment | 2.6 | 1.5 | | | | |
| Other cash from investing | | | | 1.2 | | |
| Cash from investing | 2.3 | 1.2 | -1.3 | 0.2 | -0.4 | |
| |
| Issuance of common stock, net | | | | 19.6 | | |
| Option exercises | | | 0.0 | 0.1 | | |
| Other cash from financing | -0.1 | -1.3 | -1.1 | 3.8 | 6.5 | |
| Cash from financing | -0.1 | -1.3 | -1.1 | 23.3 | 6.5 | |
| |
| Free cash flow | -4.0 | -1.1 | -5.7 | -15.9 | -6.4 | |
| Per share (diluted) | ($0.17) | ($0.05) | ($0.25) | ($0.80) | ($1.66) | |
| |
| Cash paid for interest | 0.0 | 0.1 | 0.1 | 0.0 | 0.1 | |
| Cash paid for income taxes | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |