INVENTORIES Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Movement in Valuation Allowances and Reserves [Roll Forward]
Inventory reserves beginning balance	$ 932	$ 607
Additions	176	384
Write-offs	0	(59)
Inventory reserves ending balance	1,108	932
Inventory Valuation Reserve
Movement in Valuation Allowances and Reserves [Roll Forward]
Inventory reserves beginning balance	900
Inventory reserves ending balance	1,100	$ 900
Asset Impairment Charges
Schedule of Inventory [Line Items]
Impairment of inventory	$ 400