This excerpt taken from the XIDE DEF 14A filed Jul 16, 2007.
The Committee includes shares of restricted stock as a component of annual long-term equity awards. The Committee has traditionally determined that the issuance of restricted stock should represent a smaller percentage of the overall equity award than options. The Committee believes restricted stock is a useful tool for employee retention and established a five-year vesting schedule for such awards. The Committee has traditionally used a ten-day trailing average closing price of the Companys common stock in establishing the number of shares of restricted stock awarded to participants.