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Provision Benefit for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Foreign	$ 225	$ 181	$ 147
Federal	0	0	0
State	0	0	0
Total current	225	181	147
Foreign	0	0	0
Federal	3	3,659	28
State	1	47
Total deferred	4	3,706	28
Provision for income taxes	$ 229	$ 3,887	$ 175

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