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Employee Savings Plan	12 Months Ended
Employee Savings Plan	Dec. 31, 2011
Employee Savings Plan [Abstract]
Employee Savings Plan	11. Employee Savings Plan At December 31, 2011, we maintained a defined contribution plan covering all of our U.S. employees. Employees participating in the plan may select from several investment options. We match the participant's contribution up to a maximum of four percent of the participant's salary. The amounts contributed by the participants and us vest immediately. We expensed $68,000, $50,000, and $40,000 under this plan for 2011, 2010 and 2009, respectively.