Income Taxes - Provision For Income taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Current taxes:
Federal	$ (397)	$ 89
State	0	0
Total current taxes	(397)	89
Deferred taxes:
Federal	263	(678)
State	(43)	(178)
Adjustment to net deferred tax asset for the Tax Cuts and Jobs Act	0	2,062
Change in valuation allowance	0	(4,757)
Total deferred taxes	220	(3,551)
Total tax (benefit)	$ (177)	$ (3,462)