| In millions, except per share items | Apr-30-22 | Apr-30-21 | Apr-30-20 | Apr-30-19 | Apr-30-18 | Apr-30-17 | Apr-30-16 | Apr-30-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Revenues | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 25.2 | 28.3 |
| Revenue growth | | | | | | -100.0% | -10.9% | -7.0% |
| Cost of goods sold [+] | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 26.4 | 31.0 |
| Cost of product sales | | | | | | | 20.5 | 24.1 |
| Cost of technology services | | | | | | | 0.2 | 0.8 |
| Gross profit | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | -1.2 | -2.7 |
| Gross margin | | | | | | | -4.9% | -9.7% |
| Selling, general and administrative [+] | 5.4 | 5.0 | 3.0 | 2.8 | 3.2 | 1.7 | 5.8 | 6.2 |
| General and administrative [+] | 5.4 | 5.0 | 3.0 | 2.8 | 3.2 | 1.7 | | |
| General and administrative expenses | 1.2 | 0.9 | 0.7 | 0.6 | 0.7 | 0.3 | | |
| Professional fees | 4.2 | 4.1 | 2.4 | 2.2 | 2.5 | 1.4 | | |
| Research and development | | | | | | | | |
| Other operating expenses [+] | 9.5 | 7.4 | 2.6 | -2.8 | 5.0 | 2.4 | -6.0 | -6.2 |
| Exploration expenses | 7.2 | 4.0 | 1.3 | 2.6 | 2.5 | 1.4 | | |
| EBITDA [+] | -14.9 | -12.4 | -5.5 | 0.0 | | | -0.9 | -2.6 |
| EBITDA growth | 20.6% | 124.1% | -79404.0% | -100.1% | 97.0% | 351.1% | -65.0% | 29.9% |
| EBITDA margin | | | | | | | -3.6% | -9.3% |
| Depreciation | 0.0 | 0.0 | 0.0 | 0.0 | | | 0.1 | 0.1 |
| EBITA | -15.0 | -12.4 | -5.5 | 0.0 | -8.2 | -4.1 | -1.0 | -2.7 |
| EBITA margin | | | | | | | -4.0% | -9.7% |
| Amortization of intangibles | | | 0.2 | | | | 0.0 | |
| EBIT [+] | -15.0 | -12.4 | -5.7 | 0.0 | -8.2 | -4.1 | -1.1 | -2.7 |
| EBIT growth | 20.7% | 117.8% | | -100.0% | 97.0% | 294.8% | -61.8% | 18.6% |
| EBIT margin | | | | | | | -4.2% | -9.7% |
| Non-recurring items [+] | | | | | 0.1 | | 0.2 | |
| Loss (gain) on sale of assets | | | | | 0.1 | | 0.2 | |
| Interest expense, net [+] | | | | | 0.0 | 0.0 | 0.2 | 1.0 |
| Interest expense | | | | | 0.0 | 0.0 | 0.2 | 1.0 |
| Interest income | | | | | | 0.0 | | |
| Other income (expense), net [+] | 1.0 | | | -7.6 | | | 0.0 | -0.1 |
| Gain (loss) on debt retirement | | | | | | | 0.0 | |
| Gain (loss) on foreign currency transactions | | | | | | | 0.0 | -0.1 |
| Other | | | | | | | | -1.1 |
| Pre-tax income | -13.9 | -12.4 | -5.7 | -7.6 | -8.3 | -4.1 | -1.4 | -3.8 |
| Income taxes | 0.0 | 0.0 | -0.4 | 0.4 | -0.4 | 0.0 | 0.0 | 0.0 |
| Tax rate | 0.2% | 0.0% | 7.7% | | 5.3% | 0.0% | 0.2% | |
| Earnings from continuing ops | -13.9 | -17.9 | -7.3 | -8.0 | -3.5 | -4.1 | -1.3 | -5.6 |
| Earnings from discontinued ops | | | | | -11.8 | | | |
| Net income | -13.9 | -17.9 | -7.3 | -8.0 | -15.2 | -4.1 | -1.3 | -5.6 |
| Net margin | | | | | | | -5.3% | -19.8% |
| |
| Basic EPS [+] | ($1.92) | ($3.80) | ($3.17) | ($4.36) | ($0.26) | ($0.42) | ($4.28) | ($6.60) |
| Growth | -49.5% | 20.1% | -27.3% | 1574.7% | -38.7% | -90.1% | -35.2% | 406.2% |
| Diluted EPS [+] | ($1.92) | ($3.80) | ($3.17) | ($4.36) | ($0.26) | ($0.42) | ($4.28) | ($6.60) |
| Growth | -49.5% | 20.1% | -27.3% | 1574.7% | -38.7% | -90.1% | -35.2% | 406.2% |
| |
| Shares outstanding (basic) [+] | 7.3 | 4.7 | 2.3 | 1.8 | 13.4 | 9.8 | 0.3 | 0.8 |
| Growth | 53.9% | 103.4% | 25.4% | -86.2% | 36.8% | 3015.6% | -62.9% | -57.7% |
| Shares outstanding (diluted) [+] | 7.3 | 4.7 | 2.3 | 1.8 | 13.4 | 9.8 | 0.3 | 0.8 |
| Growth | 53.9% | 103.4% | 25.4% | -86.2% | 36.8% | 3015.6% | -62.9% | -57.7% |
| |
| EBIT is a non-GAAP figure that excludes all non-recurring expenses: restructuring costs, asset impairments, IPR&D writeoffs, and other unusual charges. |