We may offer and sell up to $250,000,000 in the aggregate of our common shares ("Common Shares"), warrants to purchase Common Shares ("Warrants") and/or units consisting of Common Shares and Warrants ("Units"), which we refer to collectively as the "securities." In addition, the selling shareholders may offer and sell up to 7,000,000 Common Shares. This prospectus describes the general terms of these securities and the general manner in which we and the selling shareholders will offer these securities. We or the selling shareholders will provide the specific terms of the securities that may be offered, and the manner in which they are being offered, in one or more supplements to this prospectus. Any supplement may also add, update or change information contained in this prospectus. This prospectus is not an offer to sell the securities and it is not soliciting an offer to buy the securities in any state where the offer or sale is not permitted. Neither we nor the selling shareholders will use this prospectus to offer any securities unless it is attached to a prospectus supplement. You should read both this prospectus and any prospectus supplement, together with the additional information described under the heading "Where You Can Find More Information," before investing in the securities. The amount and price of the securities will be determined at the time of any offering thereof.