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Income Taxes - Reconciliation of Effective Tax Rate (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
U.S. federal statutory tax rate	(21.00%)	(35.00%)	(21.00%)	(35.00%)
State income taxes, net of federal benefit	6.00%	(4.80%)	0.50%	(3.80%)
Non-U.S. income taxed at different rates	(15.30%)	(0.10%)	(0.40%)	0.10%
Reduction in tax benefit related to stock-based awards	33.50%	13.40%	1.40%	10.70%
Non-deductible expenses	18.30%	(1.50%)	10.40%	(1.20%)
Research and development credit	(20.20%)	2.60%	(0.80%)	2.00%
Valuation allowance	43.90%	0.10%	36.40%	0.10%
Other	0.20%	(3.00%)	0.20%	(1.90%)
Effective income tax rate	45.40%	(28.30%)	26.70%	(29.00%)

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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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