Total operating expenses for the years ended May 31, 2019 were approximately as follows:
2019
General and administrative:
Salaries and other compensation - $3,781,000
Stock-based compensation $3,388,000
Other $4,948,000
Total general and administrative $12,117,000
Research and development $42,490,000
Amortization and depreciation $1,245,000
Total operating expenses $55,852,000