| In millions, except per share items | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 | Dec-31-11 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| OPERATING ACTIVITIES: | | | | | | | | |
| Net loss | -36.5 | -43.1 | -23.7 | -22.3 | -6.3 | 6.3 | 7.2 | -1.4 |
| Less: Income from discontinued operations, net of income taxes | -7.9 | -10.7 | | | | | | |
| Loss from continuing operations | -44.4 | -53.9 | | | | | | |
| |
| Adjustments to reconcile net loss to net cash used in operating activities: | | | | | | | | |
| Depreciation | 6.8 | 7.6 | 9.9 | 11.4 | 11.2 | 8.9 | 7.1 | 6.8 |
| Amortization of intangible assets | 1.2 | 0.8 | | 0.2 | 0.2 | 0.3 | 0.4 | 0.6 |
| Non-cash interest expense | 1.8 | 0.4 | | | | 0.1 | 0.1 | 0.1 |
| Defined benefit plan cost | 0.7 | 0.4 | 0.1 | -0.2 | -0.4 | | | |
| Stock-based compensation expense | 9.0 | 8.2 | 5.4 | 3.9 | 4.0 | 4.0 | 3.1 | 2.6 |
| Gain on sale of property and equipment | 0.0 | | -0.1 | | | | | |
| Provision for losses on inventory | 1.5 | 2.1 | 0.4 | 0.5 | 0.9 | 1.6 | -1.3 | 0.6 |
| Provision for warranties | 0.1 | 0.3 | 0.4 | 1.3 | 0.7 | | | |
| Changes in operating assets and liabilities: | | | | | | | | |
| Trade and other accounts receivable | 2.8 | -9.4 | 20.1 | 0.3 | -15.1 | 3.7 | -4.9 | -0.8 |
| Inventories | -12.3 | 5.6 | -5.0 | 5.3 | -1.5 | -4.6 | -7.0 | -14.7 |
| Prepaid expenses and other assets | 0.2 | 0.4 | -0.4 | 0.0 | -0.1 | 0.1 | 0.3 | 0.1 |
| Accounts payable and accrued liabilities | -9.8 | 12.1 | -16.4 | 2.4 | 0.8 | 1.5 | -10.2 | 8.7 |
| Deferred revenue and other current liabilities | -1.8 | 2.2 | 0.6 | 2.4 | 0.0 | | | |
| Accrued employee compensation | -0.2 | 1.1 | -1.5 | -2.7 | 0.7 | 4.0 | -1.7 | 0.3 |
| Deferred tax liability | -5.9 | -0.1 | 2.0 | 2.0 | 2.3 | 1.0 | 0.6 | -1.1 |
| Defined benefit plan and other long-term liabilities | -1.2 | -0.2 | -0.8 | -0.5 | -0.7 | 2.3 | -2.0 | -5.6 |
| Net cash used in operating activities - continuing operations | -50.8 | -22.8 | | | | | | |
| |
| Net cash provided by operating activities - discontinued operations | -2.8 | 7.8 | | | | | | |
| Net cash provided by operating activities - discontinued operations | -53.6 | -15.0 | -14.4 | 9.4 | -6.2 | 19.9 | -1.1 | -5.1 |
| |
| INVESTING ACTIVITIES: | | | | | | | | |
| Purchases of property and equipment | -10.3 | -3.4 | -6.0 | -4.1 | -7.0 | -16.9 | -15.2 | -14.5 |
| Proceeds from sale of property and equipment | 0.0 | | 0.1 | | | | | |
| Net cash used in investing activities - continuing operations | -10.3 | -2.0 | | | | | | |
| |
| Net cash used in investing activities - discontinued operations | 49.0 | -2.4 | | | | | | |
| Total net cash used in investing activities | 38.8 | -4.4 | 14.7 | -4.1 | -7.0 | -16.9 | -15.2 | -14.5 |
| |
| FINANCING ACTIVITIES: | | | | | | | | |
| Payments related to finance lease | -15.4 | | | | | | | |
| Line of credit borrowings | 15.0 | | | | | | | |
| Net cash provided by (used in) financing activities - continuing operations | 23.0 | 43.3 | | | | | | |
| |
| Net cash used in financing activities - discontinued operations | 0.0 | 0.0 | | | | | | |
| Total net cash provided by (used in) financing activities | 22.9 | 43.3 | 0.8 | -5.4 | 9.6 | -1.4 | 15.6 | 10.4 |
| Effect of exchange rate changes on cash and cash equivalents | -0.2 | 0.9 | | | | | | |