Acquisitions (Details) - USD ($) $ in Thousands		12 Months Ended
	Sep. 06, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Asset Acquisition [Line Items]
Cash payments for asset acquisitions		$ 10,700	$ 179,624	$ 0
Acquisition holdback placed in escrow		$ 0	$ 25,000
Modis Acquisition
Asset Acquisition [Line Items]
Consideration transferred	$ 246,500
Cash payments for asset acquisitions	175,500
Aggregate upfront consideration	3,500
Net working capital adjustment receivable	600
Acquisition holdback placed in escrow	$ 25,000
Royalty on future sales (percent)	5.00%
Fair value of intangible assets acquired	$ 244,500
Fair value of liabilities assumed	2,800
Modis Acquisition | Upon FDA approval
Asset Acquisition [Line Items]
Milestone payments	100,000
Modis Acquisition | Upon EMA Approval in Europe
Asset Acquisition [Line Items]
Milestone payments	50,000
Modis Acquisition | Unvested Awards
Asset Acquisition [Line Items]
Fair value of stock issued for asset acquisition	$ 4,900
Common Stock | Modis Acquisition
Asset Acquisition [Line Items]
Shares issued as part of asset acquisition consideration (shares)	1,595,025
Fair value of stock issued for asset acquisition	$ 68,100