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Income Taxes - Effective Income Tax Reconciliation (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax at U.S. statutory rate	21.00%	21.00%	21.00%
State, net of federal benefit	(169.50%)	(76.30%)	14.80%
Foreign rate differential	(285.90%)	(19.40%)	(3.00%)
Share-based compensation	2901.50%	695.40%	178.70%
Non-deductible expenses	(50.30%)	0.40%	(4.40%)
Tax credits	351.60%	19.30%	26.70%
Acquisition related	0.00%	31.80%	15.20%
Convertible senior notes	(5854.80%)	(412.60%)	(0.30%)
Other	1.20%	27.90%	(1.80%)
Change in valuation allowance	2462.70%	(325.30%)	(257.50%)
Total	(622.50%)	(37.80%)	(10.60%)

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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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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