Commitments - Paragon Collaboration Agreement (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended
	May 31, 2020	Apr. 30, 2020	Mar. 31, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Term of manufacturing and supply agreement		5 years
Additional extension term of manufacturing and supply agreement		5 years
Subsequent Event [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Minimum amount agreed to purchase in batches of drug product		$ 10.6
Catalent
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Period for which annual fee is payable			5 years
Catalent | Subsequent Event [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Upfront payments	$ 1.0
Annual fee payable	5.0
Quarterly fee payable	$ 1.3
Period for which annual fee is payable	5 years