Equity award grants may be made at varying times and in varying amounts in the discretion of the compensation committee, but are generally approved for executive officers, including the named executive officers, once a year unless an executive officer is promoted, in which case a grant will normally be made at that time, or, in rare circumstances, for recognition of outstanding performance. Our equity incentive grant policy, which was initially approved by our board of directors after the Azur Merger and amended and restated in July 2013, provides that all equity grants that are approved for executive officers will be granted on the second trading day following the filing date of our next quarterly or annual report filed under the Exchange Act that occurs after the date on which such grants are approved by our board of directors or compensation committee, as applicable. Accordingly, our equity incentive grant policy requires that grants to our executive officers, if any, be made shortly after we have released information about our financial performance to the public for the applicable annual or quarterly period, so that the market will have an opportunity to absorb the financial and other information included in our annual and periodic reports before such grants are awarded. As a result, the timing of equity awards is not coordinated in a manner that intentionally benefits our executive officers; rather, the policy is designed with the objective that the market price of our ordinary shares at the time of grant can generally be expected to reflect our then-current results and prospects.
For all employees, the exercise price of stock options is equal to the fair market value (the closing price as reported on the NASDAQ Global Select Market) of our shares on the date of grant. Stock option grants generally vest 25% upon the one year anniversary of the vesting commencement date, which is generally the employment commencement date for new hire grants and the grant date for annual grants, and vest as to the remainder of the shares in 36 equal monthly installments thereafter, subject to the option holder’s continued service with us. RSUs typically vest annually over four years from the grant date, also subject to the holder’s continued service with us. Stock options and RSUs are subject to potential vesting acceleration as described below under the heading “Potential Payments upon Termination or Change in Control.”