| 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 |
| Net sales | 10.9 | 13.5 | 20.1 | 29.8 | 39.3 | 31.9 | 95.3 | 232.4 |
| Net sales growth | -19.7% | -32.7% | -32.5% | -24.2% | 23.3% | -66.6% | -59.0% | -10.3% |
| Cost of sales | 11.5 | 14.9 | 22.1 | 31.6 | 44.5 | 34.1 | 97.2 | 160.4 |
| Gross loss | -0.7 | -1.4 | -2.0 | -1.8 | -5.2 | -2.2 | -1.8 | 72.0 |
| Gross margin | -6.1% | -10.2% | -10.0% | -6.1% | -13.3% | -7.0% | -1.9% | 31.0% |
| Selling, general and administrative expenses | 5.6 | 6.1 | 7.1 | 10.2 | 12.8 | 18.3 | 21.3 | 27.8 |
| Research and development expense | 0.8 | 0.7 | 1.2 | 1.3 | 1.2 | 2.7 | 4.4 | 2.6 |
| Provision for bad debt expense | 0.6 | -0.9 | 2.4 | -0.3 | 0.5 | 1.8 | 0.5 | 0.4 |
| Asset impairment expense | | | | | | 0.2 | 37.4 | 1.9 |
| Operating loss | -7.7 | -7.3 | -12.6 | -13.0 | -19.7 | -25.2 | -283.5 | -24.6 |
| Operating margin | -71.0% | -53.6% | -62.9% | -43.7% | -50.2% | -79.2% | -297.3% | -10.6% |
| Interest (expense) income, net | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | -0.2 | 0.2 |
| Other income, net | 2.2 | 2.7 | -1.8 | -0.7 | 3.6 | | 7.2 | |
| Gain/(loss) on disposal of fixed assets | -0.4 | -0.4 | -0.9 | | -0.5 | 0.2 | | |
| Foreign currency transaction (loss) gain | -0.2 | 0.1 | -0.5 | 0.0 | 0.3 | -0.4 | -0.3 | 0.2 |
| Loss before income tax (benefit) expense | -6.2 | -4.9 | -15.9 | -13.8 | | | | |
| Income tax (benefit) expense | 0.4 | -0.2 | | 0.4 | -6.5 | 7.3 | 66.3 | -10.7 |
| Net loss | -5.8 | -5.1 | -15.9 | -13.4 | -22.7 | -18.3 | -211.6 | -39.4 |
| |
| Other comprehensive loss: | | | | | | | | |
| Foreign currency translation | -0.3 | 1.1 | -0.6 | -1.8 | -2.1 | 0.5 | 0.1 | -1.6 |
| Other comprehensive loss | -0.3 | 1.1 | -0.6 | -1.8 | -2.1 | 0.5 | 0.1 | -1.6 |
| Comprehensive loss | -6.1 | -4.0 | -16.5 | -11.3 | -25.8 | -17.8 | -207.2 | -2.9 |
| |
| Net loss per share (Note 3): | | | | | | | | |
| Basic (in dollars per share) | ($0.29) | ($0.27) | ($1.72) | ($0.52) | ($2.16) | ($1.32) | ($15.06) | ($0.03) |
| Diluted (in dollars per share) | ($0.29) | ($0.27) | ($1.72) | ($0.52) | ($2.16) | ($1.32) | ($15.06) | ($0.03) |
| |
| Weighted–average shares outstanding (Note 3): | | | | | | | | |
| Basic (in shares) | 19.8 | 18.9 | 18.4 | 18.1 | 10.9 | 13.9 | 13.8 | 40.9 |
| Diluted (in shares) | 19.8 | 18.9 | 18.4 | 18.1 | 10.9 | 13.9 | 13.8 | 40.9 |