| In millions, except per share items | Sep-30-19 | Jun-30-19 | Mar-31-19 | Dec-31-18 | Sep-30-18 | Jun-30-18 | Mar-31-18 | Dec-31-17 |
| | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| Net sales | 1.2 | 1.7 | 1.8 | 2.1 | 2.5 | 2.5 | 3.7 | 3.2 |
| Net sales growth | -51.5% | -32.4% | -51.5% | -36.0% | -27.9% | -17.7% | 0.9% | 9.1% |
| Cost of sales | 2.1 | 2.6 | 2.8 | 2.6 | 3.0 | 3.5 | 2.4 | 3.6 |
| Gross loss | -0.9 | -0.9 | -1.0 | -0.5 | -0.5 | -1.0 | 1.3 | -0.4 |
| Gross margin | -69.8% | -53.6% | -55.7% | -25.4% | -18.0% | -38.8% | 34.7% | -11.8% |
| Selling, general and administrative expenses | 1.1 | 1.2 | 1.3 | 1.2 | 1.3 | 1.4 | 1.7 | 1.2 |
| Research and development expense | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.0 |
| Provision for bad debt expense | 0.3 | 0.5 | 0.3 | 0.2 | 0.4 | 0.1 | -0.1 | -0.1 |
| Asset impairment expense | 0.5 | | | | | | | |
| Operating loss | -3.0 | -2.8 | -2.8 | -2.2 | -2.4 | -2.6 | -0.5 | -1.5 |
| Operating margin | -246.7% | -165.3% | -156.7% | -105.4% | -93.5% | -103.9% | -14.5% | -46.9% |
| Interest (expense) income, net | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Other income, net | 1.7 | 0.0 | 0.0 | 0.1 | 0.9 | 0.2 | 1.0 | 1.1 |
| Gain/(loss) on disposal of fixed assets | 0.2 | 0.0 | | 0.0 | 0.0 | -0.4 | | |
| Foreign currency transaction (loss) gain | -0.2 | 0.1 | -0.1 | -0.1 | 0.0 | -0.1 | -0.1 | 0.0 |
| Loss before income tax (benefit) expense | -1.4 | -2.8 | -2.9 | -2.1 | -1.5 | -2.9 | 0.4 | -0.4 |
| Income tax (benefit) expense | | 0.2 | 0.1 | 0.4 | 0.2 | -0.2 | -0.1 | -0.5 |
| Net loss | -1.4 | -2.6 | -2.9 | -1.7 | -1.3 | -3.1 | 0.3 | -0.9 |
| |
| Other comprehensive loss: | | | | | | | | |
| Foreign currency translation | -0.1 | 0.0 | -0.1 | -0.1 | -0.2 | -0.5 | 0.5 | 0.2 |
| Other comprehensive loss | -0.1 | 0.0 | -0.1 | -0.1 | -0.2 | -0.5 | 0.5 | 0.2 |
| Comprehensive loss | -1.6 | -2.6 | -3.0 | -1.8 | -1.5 | -3.6 | 0.8 | -0.7 |
| |
| Net loss per share (Note 3): | | | | | | | | |
| Basic (in dollars per share) | ($0.07) | ($0.13) | ($0.14) | ($0.08) | ($0.07) | ($0.16) | $0.02 | ($0.04) |
| Diluted (in dollars per share) | ($0.07) | ($0.13) | ($0.14) | ($0.08) | ($0.07) | ($0.16) | $0.02 | ($0.04) |
| |
| Weighted–average shares outstanding (Note 3): | | | | | | | | |
| Basic (in shares) | 20.2 | 20.2 | 20.2 | 19.8 | 20.1 | 19.7 | 19.6 | 18.9 |
| Diluted (in shares) | 20.2 | 20.2 | 20.2 | 19.8 | 20.1 | 19.7 | 19.7 | 18.9 |