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Related Party Transactions (Details) (AHH, USD $)
In Thousands, unless otherwise specified

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

AHH

Physician and clinical research expenses

$ 125

$ 209

^[1]

$ 114

Company revenue derived from AHH

$ 690

$ 912

^[1]

$ 1,064

[1]	Due to Dr. Diethrich's retirement from the Board of Directors of AHH in October 2010, AHH was not considered to be a related-party to the Company during 2012 and 2011, and is presented for comparative purposes only.

- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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