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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts receivable, gross	$ 1,873	$ 4,887
Less allowance for doubtful accounts	(1,303)	(4,013)
Accounts receivable, net	570	874
Medicaid [Member]
Accounts receivable, gross	17	131
Medicare [Member]
Accounts receivable, gross	492	1,054
Self-Pay [Member]
Accounts receivable, gross	94	276
Third Party Payers [Member]
Accounts receivable, gross	1,102	3,373
Contract Diagnostic Services and Other [Member]
Accounts receivable, gross	$ 168	$ 53

X

- 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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