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Income Taxes - Reconciliation of Statutory Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Singapore statutory income tax rate	21.00%	35.00%
Singapore [Member]
Income Taxes [Line Items]
Singapore statutory income tax rate	17.00%	17.00%	17.00%
Federal and state tax credits	6.60%	5.70%	3.10%
Permanent differences	(0.30%)	(2.60%)	(0.90%)
Changes in reserves for uncertain tax positions	(2.30%)	(3.50%)	(3.60%)
Foreign rate differential	7.80%	2.80%	(0.10%)
Tax rate change	(0.30%)	(0.90%)
Other	0.20%	0.40%	(0.70%)
Change in deferred tax asset valuation allowance	(28.70%)	(19.70%)	(15.70%)
Effective income tax rate		(0.80%)	(0.90%)

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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Effective income tax rate reconciliation change in reserve for uncertain tax positions.

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Income Taxes [Line Items]

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