Employee benefit plans	12 Months Ended
Dec. 31, 2011
Employee benefit plans [Abstract]
Employee benefit plans	13. Employee benefit plans The Company sponsors a 401(k) defined contribution plan covering all employees meeting certain eligibility requirements. Contributions made by the Company are determined annually by the Board of Directors. To date, the Company has made no contributions to this plan.

The entire disclosure for pension and other postretirement benefits.

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13. Employee benefit plans