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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accounts receivable, gross	$ 4,926	$ 4,887
Less allowance for doubtful accounts	(4,301)	(4,013)
Accounts receivable, net	625	874
Medicaid [Member]
Accounts receivable, gross	106	131
Medicare [Member]
Accounts receivable, gross	1,057	1,054
Self-Pay [Member]
Accounts receivable, gross	232	276
Third Party Payers [Member]
Accounts receivable, gross	3,380	3,373
Contract Diagnostic Services and Other [Member]
Accounts receivable, gross	$ 151	$ 53

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- Definition

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

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