SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Correction of Immaterial Errors on Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss	$ (22,280)	$ (13,389)	$ (26,241)
Depreciation and amortization expense	23,888	22,110	13,855
Deferred taxes	(4,604)	(10,895)	1,962
Inventory, net	(430)	(8,527)	(1,296)
Net cash provided (used) by operating activities	13,041	6,500	22,221
Purchase of property and equipment	(4,932)	(6,419)	(17,536)
Net cash (used) provided in investing activities	$ (4,932)	(242,275)	(3,814)
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss		(10,951)	(25,728)
Depreciation and amortization expense		20,363	13,578
Deferred taxes		(11,093)	1,967
Inventory, net		(5,318)	(663)
Net cash provided (used) by operating activities		10,202	23,095
Purchase of property and equipment		(10,121)	(18,410)
Net cash (used) provided in investing activities		(245,977)	(4,688)
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss		(2,438)	(513)
Depreciation and amortization expense		1,747	277
Deferred taxes		198	(5)
Inventory, net		3,209	633
Net cash provided (used) by operating activities		(3,702)	(874)
Purchase of property and equipment		(3,702)	(874)
Net cash (used) provided in investing activities		$ 3,702	$ 874