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Income Taxes - Reconciliation of Statutory Federal Tax Rate to Effective Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal statutory tax rate	35.00%	35.00%	35.00%
State income taxes, net of Federal income tax benefit	4.00%	4.00%	4.00%
Nondeductible expenses	1.00%	1.00%	3.00%
Research credit, Federal benefit	(3.00%)	(2.00%)	(1.00%)
Section 199 - Qualified production activities	(2.00%)	(2.00%)	(3.00%)
Stock-based compensation	(21.00%)	(12.00%)	(0.00%)
Return to provision	(1.00%)	(0.00%)	(0.00%)
Remeasurement of deferred tax assets	1.00%	0.00%	0.00%
Other	(1.00%)	(1.00%)	0.00%
Effective income tax rate	13.00%	23.00%	38.00%

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Effective income tax rate reconciliation remeasurement of deferred tax assets.

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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 deduction for qualified production activity.

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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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