SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accounts receivable, gross	$ 3,181	$ 4,887
Less allowance for doubtful accounts	(2,484)	(4,013)
Accounts receivable, net	697	874
Medicaid [Member]
Accounts receivable, gross	45	131
Medicare [Member]
Accounts receivable, gross	727	1,054
Self-Pay [Member]
Accounts receivable, gross	139	276
Third-Party Payor [Member]
Accounts receivable, gross	2,111	3,373
Contract Diagnostic Services [Member]
Accounts receivable, gross	$ 159	$ 53