Supplemental Information - Schedule of Revenues by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 101,828	$ 73,309	$ 351,318
Zai License and Collaboration Agreement
Revenues from External Customers and Long-Lived Assets [Line Items]
Regulatory and commercial milestone payable	2,000
Zai License and Collaboration Agreement | License | Accounting Standards Update 2014-09
Revenues from External Customers and Long-Lived Assets [Line Items]
Liability, revenue recognized	90
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	69,259	46,604	232,805
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	21,802	20,238	86,564
Other EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	2,674	2,282	8,782
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	6,451	3,370	17,912
Greater China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 1,642	$ 815	$ 5,255