Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015 item	Mar. 31, 2014
Segment Information
Number of operating segments	3us-gaap_NumberOfOperatingSegments
Segment information
Revenues	$ 43,435us-gaap_Revenues	$ 37,162us-gaap_Revenues
Income (loss) before income taxes	79	(6,967)
Depreciation and amortization	2,952us-gaap_DepreciationAndAmortization	2,753us-gaap_DepreciationAndAmortization
Capital expenditures	2,072	3,859
Patient Services
Segment information
Revenues	34,981	29,294
Capital expenditures	1,148	3,401
Research Services
Segment information
Revenues	5,428	4,840
Capital expenditures	856	405
Product
Segment information
Revenues	3,026	3,028
Capital expenditures	68	53
Operating segments \| Patient Services
Segment information
Income (loss) before income taxes	8,889	5,533
Depreciation and amortization	1,809	1,572
Operating segments \| Research Services
Segment information
Income (loss) before income taxes	377	(214)
Depreciation and amortization	908	884
Operating segments \| Product
Segment information
Revenues	991	3,036
Income (loss) before income taxes	913	2,086
Depreciation and amortization	94	133
Corporate and Other
Segment information
Revenues	(991)	(3,036)
Income (loss) before income taxes	(10,100)	(14,372)
Depreciation and amortization	$ 141	$ 164

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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