| In millions, except per share items | Jun-30-23 | Mar-31-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Revenue | 85.3 | 74.2 | 117.8 | 118.1 | 117.8 | 42.3 | 107.1 | 98.7 |
| Revenue growth | -27.6% | 75.5% | 10.0% | 19.7% | 58.9% | 1.8% | 114.7% | 82.3% |
| Cost of goods sold | | | | | | | | |
| Gross (loss) profit | -8.6 | 21.6 | 15.2 | 20.0 | 1.0 | -7.2 | 26.1 | 8.2 |
| Gross margin | -10.1% | 29.1% | 12.9% | 16.9% | 0.8% | -16.9% | 24.4% | 8.3% |
| |
| Selling, general, and administrative expenses | | | | | | | | |
| Compensation expense | 1.0 | 1.1 | 1.2 | 1.0 | 0.7 | 0.7 | 1.0 | 0.6 |
| Other expense | 0.9 | 1.0 | 1.0 | 1.0 | 0.9 | 1.0 | 2.1 | 0.5 |
| Related party expense | 0.2 | 0.2 | | | 0.2 | 0.2 | | |
| Research and development expenses | 1.0 | 1.1 | 1.0 | 1.0 | 0.8 | 0.7 | 1.1 | 0.8 |
| Total operating expenses | 3.0 | 3.4 | 3.4 | 3.1 | 2.5 | 2.5 | 4.3 | 2.1 |
| (Loss) income from operations | -11.6 | 18.3 | 11.8 | 16.9 | -1.5 | -9.6 | 21.8 | 6.1 |
| Operating margin | -13.6% | 24.6% | 10.0% | 14.3% | -1.3% | -22.7% | 20.4% | 6.2% |
| Interest and dividend income | 1.7 | 2.3 | 2.2 | 1.2 | 0.7 | 0.7 | 0.7 | 0.7 |
| Interest expense | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Gain (loss) on marketable securities | 0.0 | 0.5 | -0.6 | -0.6 | -3.2 | -4.1 | 0.1 | -0.7 |
| Other expense | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | | 1.5 | 0.0 |
| Other income (expense) | 1.7 | 2.8 | 1.6 | 0.6 | -2.5 | -3.5 | 3.6 | -0.1 |
| (Loss) income before taxes | -9.8 | 21.1 | 13.4 | 17.5 | -4.0 | -13.1 | 24.1 | 6.0 |
| Income tax provision (benefit) | 0.0 | 0.0 | -1.5 | 1.7 | -0.9 | -0.7 | 1.7 | -3.2 |
| Net (loss) income | -9.9 | 21.1 | 14.9 | 15.8 | -3.1 | -12.4 | 22.3 | 9.2 |
| |
| (Loss) earnings per common share | | | | | | | | |
| Basic (in dollars per share) | ($0.23) | $0.48 | $0.34 | $0.36 | ($0.07) | ($0.28) | $0.51 | $0.21 |
| Diluted (in dollars per share) | ($0.23) | $0.48 | $0.34 | $0.36 | ($0.07) | ($0.28) | $0.51 | $0.21 |
| |
| Weighted average shares outstanding | | | | | | | | |
| Basic (in shares) | 43.8 | 43.8 | 43.8 | 43.8 | 43.8 | 43.8 | 43.8 | 43.8 |
| Diluted (in shares) | 43.8 | 43.8 | 43.8 | 43.8 | 43.8 | 43.8 | 43.8 | 43.8 |
| |
| Comprehensive (loss) income | | | | | | | | |
| Net (loss) income | -9.9 | 21.1 | 14.9 | 15.8 | -3.1 | -12.4 | 22.3 | 9.2 |
| Other comprehensive (loss) income from unrealized net (losses) gains on available-for-sale debt securities | 0.0 | | | | -0.1 | | | |
| Income tax effect | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Total other comprehensive (loss) income, net of tax | 0.0 | | | | -0.1 | | | |
| Comprehensive (loss) income | -9.9 | 21.1 | 14.9 | 15.7 | -3.2 | -12.4 | 22.4 | 9.1 |