Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Represents the minimum period required to provide notice of intent not to renew agreement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of reimbursement from third party for rent and related operating expenses for shared space included in other income in the income statement.

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Testing and evaluation service costs directly related to generating revenues.

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Thyroid Cytopathology Partners (Details)	3 Months Ended		12 Months Ended
Thyroid Cytopathology Partners (Details)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Oct. 16, 2017 USD ($) installment
Thyroid Cytopathology Partners
Outstanding obligations	$ 3,356,000		$ 3,853,000
Thyroid Cytopathology Partners
Thyroid Cytopathology Partners
Notice of intent not to renew period			12 months
Expenses for cytopathology testing and evaluation services	900,000	$ 1,200,000
Outstanding obligations	601,000		$ 308,000
Reduction to rent expense for TCP's portion of costs for subleased space	$ 32,000	$ 25,000
Contract termination fee				$ 1,800,000.0
Payment installments for contract termination fee \| installment				8