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Provision Benefit for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Foreign	$ 181	$ 147	$ 147
Federal	0	0	0
State	0	0	0
Total current	181	147	147
Foreign	0	0	0
Federal	3,659	28	(3,750)
State	47		(68)
Total deferred	3,706	28	(3,818)
Provision (benefit) for income taxes	$ 3,887	$ 175	$ (3,671)

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Deferred Income Tax Expense (Benefit) and Tax Benefit from Unrealized Gain on Available For Sale Securities Operating Activities

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