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Income Taxes - Schedule of Reconciliation of Effective Income Tax Amount (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax benefit (expense) at federal statutory rate	$ 2,328	$ (2,535)
Non-deductible expenses	17	5
Impact of change in statutory rate		(345)
Change in valuation allowance	(2,311)	28,384
Section 382 limitation		(25,509)
Other	(35)
Provision for income taxes	$ 0	$ 0

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Income Tax Reconciliation Limitation Of Net Operating Loss

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

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Amount 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 increase (decrease) in the valuation allowance for deferred tax assets.

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