SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Correction of Immaterial Errors on the Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Inventories, net	$ 24,111	$ 24,045	$ 24,337	$ 15,811
Property and equipment, net	21,073		36,141	38,921
TOTAL ASSETS	675,981		683,606	444,392
Deferred tax liability, net	13,955	19,042	19,367	30,404
TOTAL LIABILITIES	385,751		376,088	212,512
Accumulated deficit	(138,709)	$ (116,429)	(115,433)	(102,044)
Total stockholders' equity	$ 290,230		307,518	231,880	$ 251,282
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Inventories, net			20,496	15,178
Property and equipment, net			43,283	40,615
TOTAL ASSETS			686,907	445,453
Deferred tax liability, net			19,174	30,409
TOTAL LIABILITIES			375,895	212,517
Accumulated deficit			(111,939)	(100,988)
Total stockholders' equity			311,012	232,936
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Inventories, net			3,841	633
Property and equipment, net			(7,142)	(1,694)
TOTAL ASSETS			(3,301)	(1,061)
Deferred tax liability, net			193	(5)
TOTAL LIABILITIES			193	(5)
Accumulated deficit			(3,494)	(1,056)
Total stockholders' equity			$ (3,494)	$ (1,056)