SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts receivable, gross	$ 3,825	$ 3,248
Less allowance for doubtful accounts	(2,942)	(2,674)
Accounts receivable, net	883	574
Medicaid [Member]
Accounts receivable, gross	31	107
Medicare [Member]
Accounts receivable, gross	1,692	814
Self-Pay [Member]
Accounts receivable, gross	65	88
Third Party Payer [Member]
Accounts receivable, gross	1,710	2,203
Contract Diagnostic Services [Member]
Accounts receivable, gross	$ 327	$ 36