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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounts receivable, gross	$ 2,713	$ 2,398
Less allowance for doubtful accounts	(1,912)	(1,708)
Accounts receivable, net	801	690
Medicaid [Member]
Accounts receivable, gross	81	82
Medicare [Member]
Accounts receivable, gross	782	633
Self-Pay [Member]
Accounts receivable, gross	106	108
Third-Party Payor [Member]
Accounts receivable, gross	1,540	1,382
Contract Diagnostic Services [Member]
Accounts receivable, gross	204	193
Clinical Research Grants and Other [Member]
Accounts receivable, gross	$ 0	$ 0

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For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

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