| In millions, except per share items | Apr-30-23 | Apr-30-22 | Apr-30-21 | Apr-30-20 | Apr-30-19 | Apr-30-18 | Apr-30-17 | Apr-30-16 |
| | 8-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K/A | 10-K |
| Revenues | 2.7 | 1.8 | 1.2 | 1.7 | 0.6 | 0.5 | -10.7 | 0.7 |
| Revenue growth | 55.3% | 45.9% | -28.3% | 166.1% | 23.7% | -104.8% | -1624.7% | -82.8% |
| Cost of goods sold | 2.5 | 1.9 | 2.3 | 1.8 | 1.3 | 0.8 | 0.9 | 0.7 |
| Gross profit | 0.2 | -0.1 | -1.1 | -0.1 | -0.7 | -0.3 | -11.7 | 0.0 |
| Gross margin | 8.6% | -5.7% | -89.0% | -6.2% | -106.2% | -49.3% | 108.7% | 5.2% |
| Selling, general and administrative | 28.3 | 21.5 | 12.5 | 6.9 | 7.6 | 7.0 | | 6.7 |
| Research and development | | | | 4.3 | 5.0 | 4.3 | | 7.1 |
| Other operating expenses | 1.1 | | 1.2 | | | | | |
| EBITDA [+] | | -21.5 | -14.7 | -11.2 | -13.1 | -11.4 | -11.5 | -13.6 |
| EBITDA growth | 36.1% | 46.3% | 30.9% | -14.4% | 14.5% | -0.9% | -15.4% | 2.5% |
| EBITDA margin | -1069.4% | -1220.5% | -1216.7% | -666.3% | -2071.4% | -2238.4% | 107.4% | -1936.0% |
| Depreciation | | 0.1 | 0.1 | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 |
| EBITA | -29.2 | -21.5 | -14.8 | -11.4 | -13.3 | -11.6 | -11.7 | -13.8 |
| EBITA margin | -1069.4% | -1223.8% | -1228.0% | -675.7% | -2099.8% | -2262.2% | 108.7% | -1951.9% |
| Amortization of intangibles | | 0.1 | 0.0 | | | | | |
| EBIT [+] | -29.2 | -21.6 | -14.8 | -11.4 | -13.3 | -11.6 | -11.7 | -13.8 |
| EBIT growth | 35.2% | 45.9% | 30.4% | -14.4% | 14.8% | -1.1% | -15.1% | -3.7% |
| EBIT margin | -1069.4% | -1228.7% | -1228.5% | -675.7% | -2099.8% | -2262.2% | 108.7% | -1951.9% |
| Non-recurring items [+] | | | -1.2 | | | | | 1.1 |
| Legal settlement | | | -1.2 | | | | | 1.1 |
| Interest income | 0.9 | 0.1 | 0.1 | 0.1 | 0.0 | 0.1 | 0.0 | 0.0 |
| Interest income | 0.9 | 0.1 | 0.1 | 0.1 | 0.0 | 0.1 | 0.0 | 0.0 |
| Other income (expense), net [+] | 1.7 | 0.8 | -1.3 | 0.0 | 0.1 | 0.2 | 1.5 | 0.1 |
| Gain (loss) on debt retirement | | 0.9 | | | | | | |
| Gain (loss) on foreign currency transactions | | 0.0 | 0.0 | 0.0 | -0.1 | 0.1 | 0.0 | -0.1 |
| Change in fair value of warrants | | | | 0.0 | 0.2 | 0.1 | | |
| Other non-operating income | | 0.1 | | | | 0.0 | | |
| Other non-ooperating expenses | | | -0.1 | | | | | |
| Other | | 0.1 | -0.1 | | | 0.0 | | 0.2 |
| Pre-tax income | -26.6 | -20.7 | -14.8 | -11.2 | -13.1 | -11.3 | -10.2 | -14.8 |
| Income taxes | -0.3 | -1.8 | 0.0 | -0.9 | -0.9 | -1.1 | -0.7 | -1.7 |
| Tax rate | 1.0% | 8.8% | 0.0% | 8.0% | 6.5% | 9.9% | 6.9% | 11.3% |
| Minority interest | | | | | | | | 0.0 |
| Net income | -26.3 | -18.9 | -14.8 | -10.4 | -12.2 | -10.2 | -9.5 | -13.1 |
| Net margin | -963.6% | -1073.0% | -1223.9% | -615.5% | -1937.7% | -1987.7% | 88.3% | -1862.3% |
| |
| Basic EPS [+] | ($0.47) | ($0.35) | ($0.49) | ($1.44) | ($9.52) | ($13.24) | ($2.23) | ($7.25) |
| Growth | 34.5% | -28.9% | -65.8% | -84.9% | -28.1% | 494.3% | -69.3% | -3.3% |
| Diluted EPS [+] | ($0.47) | ($0.35) | ($0.49) | ($1.44) | ($9.52) | ($13.24) | ($2.23) | ($7.25) |
| Growth | 34.5% | -28.9% | -65.8% | -84.9% | -28.1% | 494.3% | -69.3% | -3.3% |
| |
| Shares outstanding (basic) [+] | 56.0 | 54.0 | 30.0 | 7.2 | 1.3 | 0.8 | 4.3 | 1.8 |
| Growth | 3.7% | 79.9% | 316.4% | 460.3% | 67.7% | -82.0% | 135.3% | 3.5% |
| Shares outstanding (diluted) [+] | 56.0 | 54.0 | 30.0 | 7.2 | 1.3 | 0.8 | 4.3 | 1.8 |
| Growth | 3.7% | 79.9% | 316.4% | 460.3% | 67.7% | -82.0% | 135.3% | 3.5% |
| |
| EBIT is a non-GAAP figure that excludes all non-recurring expenses: restructuring costs, asset impairments, IPR&D writeoffs, and other unusual charges. |