Income Taxes - Summary of Components of Income Tax Benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Current income taxes
Federal	$ 0	$ 0
State	0	0
Foreign	100	0
Deferred income taxes
Federal	0	0
State	0	0
Foreign	(3,224)	(3,377)
Total income tax benefit	$ (3,124)	$ (3,377)