INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current [Abstract]
Federal	$ 0	$ 0	$ 0
State	200	150	200
Total	200	150	200
Deferred [Abstract]
Federal	0	(424)	0
State	0	0	0
Total	0	(424)	0
Total (benefit) provision	200	(274)	200
Effective income tax rate reconciliation, amount [Abstract]
Loss before taxes	(6,345)	(11,758)	(28,104)
Expected tax benefit	(1,332)	(4,115)	(9,836)
State tax benefit (net of federal)	200	150	200
Valuation allowance	1,230	(13,920)	9,726
Federal tax reform - deferred rate change	49	17,671	0
Other	53	(60)	110
Total (benefit) provision	$ 200	$ (274)	$ 200
Effective income tax rate reconciliation, percent [Abstract]
Federal corporate tax rate	21.00%	35.00%	35.00%
State tax benefit (net of federal)	(3.20%)	(1.30%)	(0.70%)
Valuation allowance	(19.40%)	118.40%	(34.60%)
Federal tax reform - deferred rate change	(0.80%)	(150.30%)	0.00%
Other	(0.80%)	0.50%	(0.40%)
Total	(3.20%)	2.30%	(0.70%)
Gross noncurrent deferred tax assets (liabilities) [Abstract]
Allowance for bad debts	$ 4,828	$ 3,792
Accrued rent	1,833	1,723
Accrued benefits	0	105
Stock-based compensation	18	387
163J interest limitation	19	0
Depreciation	16,259	15,520
Goodwill	(98)	594
Other intangibles	211	291
Pension plan liabilities	1,163	1,221
Net operating loss carryforwards	17,927	17,367
AMT credit	424	424
Gross noncurrent deferred tax assets, net	42,584	41,424
Less valuation allowance	(42,160)	(41,000)
Noncurrent deferred tax assets, net	424	424
Net operating loss carryforwards	60,300	$ 52,700
Net operating losses	7,600
Tax cuts and jobs act of 2017, incomplete accounting, change in tax rate, deferred tax liability, provisional income tax benefit	$ 400
Net operating loss carryforwards, period of ownership change	3 years
Net operating loss carryforwards, minimum percentage of ownership change	50.00%