Commitments and Contingencies - Pfizer License Agreement (Details) $ in Millions	1 Months Ended
	Mar. 31, 2015 USD ($)	Mar. 31, 2021 USD ($)
Commitments and Contingencies
Percentage of royalty payments		2.50%
Tier One Net Sales Milestone [Member]
Commitments and Contingencies
Sales based milestone payment		$ 1.0
Payments for specified global net sales milestones		500.0
Tier Two Net Sales Milestone [Member]
Commitments and Contingencies
Sales based milestone payment		1.5
Payments for specified global net sales milestones		1,000.0
Tier Three Net Sales Milestone [Member]
Commitments and Contingencies
Sales based milestone payment		4.0
Payments for specified global net sales milestones		3,000.0
Tier Four Net Sales Milestone [Member]
Commitments and Contingencies
Sales based milestone payment		8.0
Payments for specified global net sales milestones		5,000.0
Pfizer, Inc. | License Agreement
Commitments and Contingencies
Number of years after the first commercial sale	P5Y
Pfizer, Inc. | License Agreement | Milestone Payments | Maximum
Commitments and Contingencies
Potential payments upon achievement of certain milestones	37.0
YourChoice | License Agreement
Commitments and Contingencies
Royalty and milestone payment due		$ 19.5
Percentage of royalty payments		0.50%
YourChoice | License Agreement | Milestone Payments
Commitments and Contingencies
Royalty and milestone payment due		$ 5.0