STOCKHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Loss) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 99
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Amounts reclassified from accumulated other comprehensive income (loss)	17
Ending balance	116
Unrealized Gains and Losses on Available-for Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(23)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Amounts reclassified from accumulated other comprehensive income (loss)	17
Ending balance	(6)
Foreign Currency Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	122
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Amounts reclassified from accumulated other comprehensive income (loss)
Ending balance	$ 122