This excerpt taken from the XIDE DEF 14A filed Jul 24, 2009.
No Liberal Recycling Provisions
The 2009 Plan provides that only shares covering awards that expire or are forfeited or cancelled, or shares that were covered by an award the benefits of which is paid in cash instead of shares, will again be available for issuance under the 2009 Plan. The following shares will not be added back to the aggregate plan limit: (1) shares tendered in payment of the exercise price; (2) shares withheld by the Company to satisfy the tax withholding obligation; and (3) shares that are repurchased by the Company with option right proceeds. Further, all shares covered by a SAR, to the extent that it is exercised and settled in shares, and whether or not shares are actually issued to the participant upon exercise of the right, shall be considered issued or transferred pursuant to the 2009 Plan.
Repricing of options and SARs is prohibited without stockholder approval under the 2009 Plan.