Acquisitions (Details) $ in Thousands		1 Months Ended	12 Months Ended
	Sep. 06, 2019 USD ($) employee shares	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Asset Acquisition [Line Items]
Cash payments for asset acquisitions			$ 179,624	$ 0	$ 0
Acquisition holdback amount placed in escrow		$ 25,000	$ 25,000	$ 0
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 amount 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
Number of former Modis employees that continued employment subsequent to the acquisition | employee	13
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
Other asset acquisitions
Asset Acquisition [Line Items]
Cash payments for asset acquisitions		$ 2,000
Common Stock | Modis Acquisition
Asset Acquisition [Line Items]
Shares issued as part of asset acquisition consideration (shares) | shares	1,595,025
Fair value of stock issued for asset acquisition	$ 68,100