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Income Taxes - Summary of Provision for Income Taxes Reconciles to Amount Computed by Applying Statutory Federal Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal tax benefit, at statutory rate	$ (1,555)	$ (15,513)
State benefit, net of federal benefit	27	(211)
Foreign tax rate difference	24	336
Change in tax rate of net deferred tax assets	0	(38,772)
Valuation allowances offsetting tax rate change	0	38,772
Valuation allowance against future tax benefits	2,878	16,364
Research and development credits	(471)	(244)
Share-based compensation	121	876
Effect of Tax Act	0	(971)
Other	(209)	(423)
Provision for income taxes	$ 815	$ 214

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