| Research and development expenses |
| | August 31, 2021 | | | August 31, 2020 | | Machinery and equipment expenditures | | $ | 2,485,232 | | | $ | - | | Employee compensation | | | 1,492,688 | | | | 1,060,669 | | External engineering | | | 551,381 | | | | 942,117 | | Plant and laboratory operating expenses | | | 707,043 | | | | 584,394 | | Other | | | 48,453 | | | | 162,042 | | | | $ | 5,284,797 | | | $ | 2,749,222 | |
| | August 31, 2021 | | | August 31, 2020 | | Machinery and equipment expenditures | | $ | 5,108,125 | | | $ | - | | Employee compensation | | | 3,578,816 | | | | 1,879,717 | | External engineering | | | 3,454,829 | | | | 1,017,049 | | Plant and laboratory operating expenses | | | 1,398,510 | | | | 870,497 | | Other | | | 382,352 | | | | 462,547 | | | | $ | 13,922,632 | | | $ | 4,229,810 | |
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