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Reconciliation of Statutory Federal Income Tax (benefit) Rate to Company's Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax at statutory federal rate	(21.00%)	(34.00%)
State Tax (benefit)—net of federal benefit	(0.03%)	(0.00%)
Permanent differences	0.68%	0.60%
R&D credits	(0.76%)	(1.64%)
Derecognition due to Sec. 382 and 383 limitations	(20.16%)	54.08%
Change in valuation allowance	39.33%	(52.90%)
Federal tax rate change	(0.00%)	33.89%
Other	1.94%	(0.03%)

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Effective income tax rate reconciliation derecognition.

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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 changes in the income tax rates.

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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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