Note 10 - Private Securities Offerings

During the year ended May 31, 2016, the Company conducted private equity offerings (the “Equity Offerings”), in which accredited investors purchased unregistered common stock at $0.75 and $1.00 per share with warrant coverage of 50% and 25%, respectively, based on the number of shares of common stock purchased. Pursuant to the Equity Offerings, the Company sold a total of 48,659,338 shares of common stock, $0.001 par value, for aggregate gross proceeds of approximately $37.6 million and issued five-year warrants covering 23,254,230 shares of common stock. In conjunction with the Equity Offerings, the Company paid an aggregate cash fee of approximately $3.9 million to the placement agent and issued warrants covering an aggregate of 4,960,314 shares of common stock to the placement agent as additional compensation. The placement agent warrants had aggregate Black-Scholes valuations of approximately $2.7 million at issuance.

In June 2016, the Company conducted a private equity offering, in which accredited investors purchase unregistered common stock at $1.00 per share with warrant coverage of 25%, based on the number of shares of common stock purchased. Pursuant to the offering, the Company sold a total of 729,500 shares of common stock for aggregate gross proceeds of $729,500 and issued to the investors warrants with a five-year term covering 182,375 shares of common stock with an exercise price of $1.35 per share.