SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts receivable, gross	$ 4,634	$ 3,248
Less allowance for doubtful accounts	(3,280)	(2,674)
Accounts receivable, net	1,354	574
Medicaid [Member]
Accounts receivable, gross	128	107
Medicare [Member]
Accounts receivable, gross	1,166	814
Self-Pay [Member]
Accounts receivable, gross	215	88
Third Party Payer [Member]
Accounts receivable, gross	2,861	2,203
Contract Diagnostic Services [Member]
Accounts receivable, gross	$ 264	$ 36