Stock Plans	12 Months Ended
Dec. 31, 2011
Stock Plans	10. Stock Plans ARIAD Stock Option and Stock Plans The Company’s 1991, 1994, 2001 and 2006 stock option and stock plans (the “Plans”) provide for the awarding of nonqualified and incentive stock options, stock grants and restricted stock units to officers, directors, employees and consultants of the Company. Stock options become exercisable as specified in the related option certificate, typically over a four-year period, and expire ten years from the date of grant. Stock grants and restricted stock units provide the recipient with ownership of common stock subject to any rights the Company may have to repurchase the shares granted or other restrictions. The 1991 and 1994 Plans have expired according to their terms and the 2001 Plan has no shares remaining available for grant, although existing stock options granted under these Plans remain outstanding. As of December 31, 2011, there are 2,818,832 shares available for awards under the 2006 Plan. Employee Stock Purchase Plan In 1997, the Company adopted the 1997 Employee Stock Purchase Plan and reserved 500,000 shares of common stock for issuance under this plan. In June 2008, the Plan was amended to reserve an additional 500,000 shares of common stock for issuance. Under this plan, substantially all of the Company’s employees may, through payroll withholdings, purchase shares of the Company’s common stock at a price of 85 percent of the lesser of the fair market value at the beginning or end of each three-month withholding period. In 2011, 2010 and 2009, 87,331, 176,318 and 401,797 shares of common stock were issued under the plan, respectively.

10. Stock Plans

ARIAD Stock Option and Stock Plans

The Company’s 1991, 1994, 2001 and 2006 stock option and stock plans (the “Plans”) provide for the awarding of nonqualified and incentive stock options, stock grants and restricted stock units to officers, directors, employees and consultants of the Company. Stock options become exercisable as specified in the related option certificate, typically over a four-year period, and expire ten years from the date of grant. Stock grants and restricted stock units provide the recipient with ownership of common stock subject to any rights the Company may have to repurchase the shares granted or other restrictions. The 1991 and 1994 Plans have expired according to their terms and the 2001 Plan has no shares remaining available for grant, although existing stock options granted under these Plans remain outstanding. As of December 31, 2011, there are 2,818,832 shares available for awards under the 2006 Plan.

Employee Stock Purchase Plan

In 1997, the Company adopted the 1997 Employee Stock Purchase Plan and reserved 500,000 shares of common stock for issuance under this plan. In June 2008, the Plan was amended to reserve an additional 500,000 shares of common stock for issuance. Under this plan, substantially all of the Company’s employees may, through payroll withholdings, purchase shares of the Company’s common stock at a price of 85 percent of the lesser of the fair market value at the beginning or end of each three-month withholding period. In 2011, 2010 and 2009, 87,331, 176,318 and 401,797 shares of common stock were issued under the plan, respectively.