STOCKHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 99,660	$ 9,657
Amounts reclassified from accumulated other comprehensive income (loss)	8	17
Ending balance	83,757	99,660
Unrealized Gains and Losses on Available-for Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(6)	(23)
Amounts reclassified from accumulated other comprehensive income (loss)	8	17
Ending balance	2	(6)
Foreign Currency Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	122	122
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Ending balance	122	122
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	116	99
Ending balance	$ 124	$ 116