Fair Value Measurements - Narrative (Details) - Apthera, Inc.	9 Months Ended
	Sep. 30, 2020 USD ($)	Dec. 31, 2011 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration payable, maximum amount	$ 30,000,000.0	$ 32,000,000.0
Contingent consideration paid	2,000,000.0
Contingent consideration	30,000,000.0
Contingent consideration payable, minimum amount	$ 0
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business combination, contingent consideration, timing of development milestones	5 years
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business combination, contingent consideration, timing of development milestones	8 years
Weighted average cost of capital
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business combination, contingent consideration, measurement input (as a percent)	0.118
Cost of debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business combination, contingent consideration, measurement input (as a percent)	0.054