Income Taxes - Components of Income Taxes (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
State	$ (691)	$ (816)	$ (389)
Total Current	(691)	(816)	(389)
Deferred:
Benefit from income taxes	$ (691)	$ (816)	$ (389)