Percentage of change in ownership subject to offset by net operating loss carryforwards.

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Tax Cuts and Jobs Act of 2017, incomplete accounting, change in tax rate, deferred tax liability, provisional income tax benefit.

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Tax Cuts and Jobs Act of 2017, incomplete accounting, change in tax rate, provisional income tax expense (benefit).

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards.

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Percentage of domestic federal statutory tax rate applicable to pretax income (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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Provision for (benefit from) income taxes	$ 143,000	$ 27,000	$ (50,000)	$ (331,000)
Federal net operating loss carryforwards					$ 34,900,000
State net operating loss carryforwards					24,100,000
Federal research and development credits					$ 1,800,000
Deferred tax assets recognized	$ 0		$ 0
Federal tax at statutory rate			21.00%		35.00%
Amount of deferred tax assets decreased					$ 15,700,000
Provisional amount recorded related to the remeasurement					$ 0
Minimum
Operating Loss Carryforwards [Line Items]
Change in ownership percentage			50.00%