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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, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal tax benefit, at statutory rate	$ (15,513)	$ (20,463)	$ (17,718)
State benefit, net of federal benefit	(211)	(293)	(280)
Foreign tax rate difference	336	681	222
Change in tax rate of net deferred tax assets	(38,772)	0	0
Valuation allowances offsetting tax rate change	38,772	0	0
Valuation allowance against future tax benefits	16,364	19,341	15,389
Research and development credits	(244)	(1,010)	(796)
Share-based compensation	876	418	752
Change in state apportionment	0	0	2,561
Effect of Tax Act	(971)	0	0
Other	(423)	1,707	51
Provision for income taxes	$ 214	$ 381	$ 181

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