Income Taxes - Schedule of Components of Provision for (benefit from) Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ (2,678)
State	105	$ 1	$ (589)
Foreign		18
Total current	(2,573)	19	(589)
Deferred:
Federal	(242)
Total deferred	(242)
Provision for (benefit from) income taxes	$ (2,815)	$ 19	$ (589)