NET SALES SERVICE REVENUE AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts receivable, gross	$ 1,760	$ 1,857
Less allowance for doubtful accounts	(1,208)	(1,127)
Accounts receivable, net	552	730
Medicaid [Member]
Accounts receivable, gross	33	37
Medicare [Member]
Accounts receivable, gross	611	256
Self-Pay [Member]
Accounts receivable, gross	102	53
Third-Party Payor [Member]
Accounts receivable, gross	768	1,066
Contract Diagnostic Services [Member]
Accounts receivable, gross	$ 246	$ 445