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Income Taxes - Effective Tax Rate Reconciliation (Details)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
U.S. federal statutory tax rate (percent)	21.00%	35.00%
State income taxes, net of federal tax benefit	(0.10%)	(0.50%)
General business credits	(1.40%)	(3.00%)
Employee stock-based compensation	(16.10%)	(8.20%)
IRC 162(M) Limitation	2.70%	1.70%
Other	0.20%	(0.30%)
Effective tax rate (percent)	6.30%	24.70%

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IRC 162(M) Limitation

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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 equity-based compensation costs.

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