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Income Taxes - Effective Income Tax Reconciliation (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax at U.S. statutory rate	21.00%	21.00%	34.00%
State, net of federal benefit	(76.30%)	14.80%	8.30%
Foreign rate differential	(19.40%)	(3.00%)	(3.80%)
Share-based compensation	695.40%	178.70%	38.20%
Non-deductible expenses	0.40%	(4.40%)	(1.10%)
Tax credits	19.30%	26.70%	7.80%
Tax Cuts and Jobs Act impact	0.00%	0.00%	(220.20%)
Acquisition related	31.80%	15.20%	0.00%
Convertible senior notes	(412.60%)	(0.30%)	0.00%
Other	27.90%	(1.80%)	0.40%
Change in valuation allowance	(325.30%)	(257.50%)	126.60%
Total	(37.80%)	(10.60%)	(9.80%)

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