Other Income (Expense), Net - Summary of Other Income (Expense), Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other income (expense), net
Investment income	$ 80	$ 2,055
Interest expense	(1,714)	(5,869)
Non-cash interest expense on liability related to sale of future royalty	(10,925)	0
Other income (expense)	3	0
Total other income (expense), net	$ (12,556)	$ (3,814)