Property and Equipment and Field Equipment	6 Months Ended
Property and Equipment and Field Equipment	Jun. 30, 2011
Property and Equipment and Field Equipment [Abstract]
Property and Equipment and Field Equipment	4. Property and Equipment and Field Equipment Accumulated depreciation on property and equipment was $13.8 million and $11.8 million at June 30, 2011 and December 31, 2010, respectively. Accumulated depreciation on field equipment was $31.4 million and $29.1 million at June 30, 2011 and December 31, 2010, respectively. At June 30, 2011, we had $3.7 million recorded in fixed assets and other long-term liabilities related to our construction of a new manufacturing facility in Germany pursuant to the terms of our Dialyzer Production Agreement entered into in May 2009 with Asahi Kasei Kuraray Medical, or Asahi. We are overseeing construction of this new facility and will operate the new facility under a manufacturing agreement upon its completion. Asahi will fund construction costs up to an original fixed amount; however, we will be responsible for any additional costs. If the agreement is terminated, due to our breach, insolvency or bankruptcy during the construction period, Asahi has the option to require us to pay for all amounts expended for construction of the new facility. If such event occurs we would take title to the land and any construction in process. Subsequent to the completion of construction, if the agreement is terminated due to our breach, insolvency or bankruptcy or by us pursuant to certain terms of the agreement, Asahi has the option to require us to purchase the new facility from them by paying one hundred percent of the then net book value of the new facility, as calculated in accordance with GAAP. Given these options and our involvement in the construction we are considered the owner of the new facility, for accounting purposes, and will therefore record its cost as construction-in-process and a corresponding liability for the construction cost funded by Asahi. The $3.7 million recorded at June 30, 2011 reflects the construction costs incurred to date in connection with this project.

The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures.

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