Notes: Each unit consists of two shares of common stock, one redeemable Class A warrant and one redeemable Class B warrant. Each Class A warrant entitles its holder to purchase one share of common stock at an exercise price of $7.15. Each Class B warrant entitles its holder to purchase one share of common stock at an exercise price of $11.00. The Class A warrants and Class B warrants are exercisable at any time after they become separately tradable until their expiration on the fifth anniversary of the date of this prospectus. The Class A warrants and Class B warrants will be redeemable at our option for $0.25 upon 30 days' prior written notice beginning six months after the offering, provided certain conditions are met. The Class A warrants will be redeemable provided that our common stock has closed at a price at least equal to $8.80 for at least five consecutive trading days. The Class B warrants will be redeemable on the same terms, provided our common stock has closed at a price at least equal to $13.75 for five consecutive trading days. The common stock, Class A warrants and Class B warrants will trade only as part of a unit for a minimum of 30 days and, in the discretion of the representative of the underwriters, up to 45 days following the date of this prospectus, after which the common stock and the warrants will trade separately, and we will delist the units.