Fair Value Measurements - Fair Value of Contingent Consideration (Details) - Contingent Consideration $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	[1]
Projected royalties
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration payments, sales-based milestones	$ 36.6
Discount rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration payments, sales-based milestones (percent)	26.00%

[1] Unobservable inputs were weighted based on the relative estimated milestone payments.