Income Taxes - Reconciliation of Provision for Income Taxes (Benefit) and Amount Computed by Applying U.S. Federal Income Tax Rate (Detail)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	21.00%
State income tax, net of federal benefit	7.01%	2.42%
Permanent differences	(0.02%)	0.31%
Research and development credit	1.46%	1.24%
Stock compensation	(0.44%)	(0.08%)
Other	(0.09%)	0.00%
Goodwill impairment	0.00%	(6.48%)
Change in valuation allowance	(28.94%)	(18.43%)
Effective income tax rate	(0.02%)	(0.02%)

Effective income tax rate reconciliation goodwill impairment.

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Effective income tax rate reconciliation, permanent differences.

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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 difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for share-based payment arrangement.

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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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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