SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts, Beginning balance	$ (1,127)
less allowance for doubtful accounts	(584)	$ (310)
Allowances for doubtful accounts	(3,448)	(2,033)
Bad debt expense	3
Total charges	(581)
Allowance for doubtful accounts, Ending balance	(1,708)	$ (1,127)
Medicaid [Member]
less allowance for doubtful accounts	(50)
Medicare [Member]
less allowance for doubtful accounts	(150)
Third-Party Payor [Member]
less allowance for doubtful accounts	$ (384)