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Income Taxes - Reconciliation Between Statutory Federal Income Tax Rate and Effective Income Tax Rate (Detail)		1 Months Ended	12 Months Ended
	Dec. 22, 2017	Jan. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliations between the statutory federal income tax rate and the effective income tax rate
U.S. Federal statutory tax rate	35.00%		34.00%	34.00%	34.00%
State taxes			4.40%	4.60%	3.70%
Research credit			1.30%	1.00%	5.60%
Orphan drug credit			11.50%	9.00%	11.50%
Other			0.30%
Stock-based compensation			(0.70%)	(0.70%)	(1.80%)
Change in valuation allowance			(5.10%)	(47.90%)	(53.00%)
Effective change due to corporate tax rate reduction			(45.70%)
Scenario, Forecast [Member]
Reconciliations between the statutory federal income tax rate and the effective income tax rate
U.S. Federal statutory tax rate		21.00%

X

- Definition

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 orphan drug tax credit.

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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 equity-based compensation costs.

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Percentage of the difference, between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority interest income (expense), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, change in enacted tax rate, prior year income taxes, change in deferred tax asset valuation allowance, and other adjustments.

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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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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 research tax credit.

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